Terms of use for the Duovio application

1. Basic information

These Terms of Use govern the rights and obligations relating to the use of the online application Duovio, available at https://duovio.eu, and the related services.

A User is a natural person who visits the application, creates a user account, or uses its free or paid features. Hereinafter referred to as the “User”.

By using the application or creating a user account, the User confirms that they have read and agree to these Terms.

2. Purpose of the Application

Duovio is an educational and training application designed for practising interpersonal communication in simulated situations.

In particular, the Application may enable the User to:

• conduct simulated conversations with virtual characters,
• practise setting and respecting boundaries,
• practise listening, feedback, reaching agreement, and conflict resolution,
• receive automatically generated feedback,
• identify recurring communication patterns,
• receive suggestions for alternative wording,
• save training history and training recommendations.

The Application is intended for communication training. It is not a medical device or a healthcare, psychological, psychotherapeutic, diagnostic, or crisis service.

3. The Application is not a substitute for professional assistance

The Application's outputs are generated automatically, including through artificial intelligence systems. They may be inaccurate, incomplete, inappropriately worded, or unsuitable for the User's particular circumstances.

The Application:

• does not provide a psychological or psychiatric diagnosis,
• does not assess the personality of the User or any other person,
• does not determine whether a particular person is manipulative, narcissistic, dangerous, or mentally ill,
• does not provide legal, medical, or crisis advice,
• does not determine who is right in a real-life dispute,
• cannot replace an individual assessment by a professional.

Labels assigned to communication patterns serve solely as a training-oriented description of a particular response. They do not constitute a definitive assessment of the User's personality.

The User is responsible for how they use the Application's outputs. Before using a suggested response in an important or sensitive conversation, the User should consider the specific circumstances and potential consequences.

The Application is not intended for situations involving imminent danger, domestic violence, self-harm, a threat to life, or any other acute crisis. In such cases, the appropriate professional, crisis, or emergency service must be contacted.

4. User obligations and responsibility

The User must use the Application reasonably, cautiously, and with due regard to their current mental state. The Application is intended solely for communication training and is not a substitute for psychotherapy or psychological, psychiatric, medical, or crisis care.

If the User is undergoing psychotherapy, using psychological or psychiatric services, or receiving other professional care, the Operator strongly recommends that the User inform their therapist, psychologist, psychiatrist, or other treating professional that they use the Application. In particular, the User should consult that professional as to whether use of the Application is suitable for them and how they should work with its outputs.

A User who experiences mental health difficulties, is undergoing a period of increased emotional strain, or knows that simulated conflict situations may place them under increased psychological strain must exercise heightened caution when using the Application. In case of doubt, they should consult a professional in advance regarding whether use is appropriate.

If use of the Application causes or aggravates anxiety, distress, stress, anger, confusion, unpleasant memories, or other mental health difficulties, the User should stop the training, reduce its difficulty, or discontinue use of the Application. If the difficulties persist or worsen, or the User feels unable to cope with the situation, they should seek professional, medical, or crisis assistance.

The User must not use the Application as the sole means of addressing serious relationship, mental health, medical, or crisis situations.

The User acknowledges that:

• the Application's outputs are generated automatically and may be inaccurate, incomplete, or unsuitable for their particular situation,
• the training presents only one of the possible recommended approaches to communication,
• the suggested wording does not constitute the only correct response or objective truth,
• the Application does not guarantee that the recommended approach to communication will lead to agreement, de-escalation of a conflict, or the desired response from another person,
• the actual response of another person may differ from that of a virtual character,
• before applying a recommendation, the User must consider the circumstances of the particular situation, safety, the nature of the relationship, and the potential consequences.

The User is responsible for their decisions, actions, and the manner in which they use the Application's outputs in real-life communication. The Operator is not liable for the reactions of third parties or for the consequences of the User's actions based solely on an automatically generated recommendation, unless the Operator's liability arises under applicable law and cannot be contractually excluded or limited.

The User must also refrain from using the Application's outputs to manipulate, coerce, intimidate, humiliate, stalk, or otherwise harm other persons.

5. User age

The Application may be used independently by persons aged 18 or over.

Persons under the age of 18 may use the Application only with the consent and under the supervision of their legal guardian, provided that the Operator expressly permits such use.

Where there are reasonable grounds for doubt, the Operator may request appropriate verification that the age requirement has been met.

6. User account and email login

To create and use an account, the User provides only an email address to which they have authorised access. During registration, the Application does not require a first name, surname, address, telephone number, date of birth, gender, or the creation of a password.

Login is performed using a time-limited, one-time login code sent to the User's email address. The Operator therefore does not store a user password. Access to the account is secured by verification of access to the email inbox and the validity of the one-time code.

The User must:

• use an email address to which they have authorised access,
• protect their email inbox against misuse,
• not disclose the login code to another person,
• not transfer the account to another person,
• not allow multiple persons to use the account,
• notify the Operator without undue delay of any suspected misuse of the account.

The service is designed so that it can be used without providing a name or other direct identifying information. From a legal perspective, however, such use is not entirely anonymous, because an email address is personal data and can be used to distinguish the account. Use of the Application is therefore pseudonymous in relation to the Operator, rather than fully anonymous.

Each User may use only one personal account unless the Operator permits otherwise.

The User is responsible for activity carried out through their account unless they did not cause the misuse of the account and notified the Operator of it without undue delay.

7. Free use and fair use policy

The basic features of the Application may be provided free of charge.

Free use is funded from the Application's public operating budget and the Operator's resources. The available funds are limited because each use of certain features, particularly artificial intelligence features, may incur costs payable to external providers.

Free use is therefore subject to a fair use policy.

For free use, the Operator may establish, in particular:

• a daily, weekly, or monthly number of training sessions,
• a number of messages or responses,
• a maximum input length,
• a maximum duration of a single training session,
• the available artificial intelligence models,
• a waiting period between requests,
• restrictions during periods of high demand,
• temporary restrictions when the public budget balance is low.

Current restrictions are displayed to the User directly in the Application. Unless expressly stated otherwise, a free account does not guarantee a fixed number of requests or uninterrupted availability of a particular model.

Limits may be adjusted on an ongoing basis according to:

• the available public budget,
• the cost of external services,
• the number of active Users,
• technical capacity,
• the need to protect the Application against misuse,
• the need to maintain reasonable availability for other Users.

8. Circumvention of limits

The User must not circumvent established limits, in particular by:

• creating multiple accounts,
• using automated tools,
• sharing an account among multiple persons,
• changing technical identifiers for the purpose of circumventing restrictions,
• submitting requests in bulk or by automated means,
• exploiting an error in the Application,
• engaging in any other conduct whose primary purpose is to obtain performance exceeding the established limit.

If circumvention of limits is suspected, the Operator may temporarily restrict requests, require account verification, or suspend the account.

Before permanently restricting an account, the Operator will generally notify the User and allow them to respond, unless the matter involves serious misuse, a security incident, or conduct that threatens the service or other Users.

9. Shared operating budget of the Application

The Operator may publish in the Application an indicative figure for the shared operating budget used to fund the availability and further development of the Application.

Funds from the shared budget may be used in particular for:

• use of external artificial intelligence models,
• operation of servers and technical infrastructure,
• data storage and security,
• technical maintenance, repairs, and updates,
• development of new features, scenarios, and translations,
• fees payable to providers of payment and other external services,
• refunds, payment chargebacks, taxes, and other costs related to the operation of the Application.

The amount displayed is an indicative operating figure. It may not correspond to the current balance of a bank account because it may take into account, in particular, fees, taxes, reserves, costs already incurred, refunds, or transactions not yet accounted for.

The shared operating budget is not the aggregate of individual user credits. Making a contribution does not confer the right to decide how particular funds are used or to request an itemised accounting of individual costs.

Information on voluntary contributions, recurring monthly payments, their cancellation, and the resolution of erroneous payments is set out in the following sections of these Terms.

10. Voluntary contributions

Following successful processing of a one-time contribution, the Operator may, as a voluntary gesture of thanks, restore the Contributor's daily, weekly, and monthly limits on one occasion. Payment of the contribution does not in itself create a legal entitlement to this gesture, and neither its availability nor its repetition is guaranteed.

Unless expressly stated otherwise during the payment process, restoration of the limits is not part of the contribution or individual consideration for making it.

A person who decides to provide financial support to the Application (hereinafter referred to as the “Contributor”) may make a one-time or recurring monthly contribution in an amount of their choice.

Contributions are intended in particular to cover the costs of artificial intelligence services, server operation, data storage and security, technical maintenance, repairs, translations, and further development of the Application.

Making a contribution does not entitle the Contributor to any particular feature, priority access, uninterrupted availability of the Application, or any other individual consideration.

Before confirming the payment, the Contributor has the opportunity to review, in particular, the amount of the contribution, the currency, and whether the contribution is one-time or recurring monthly.

The payment is processed by the external payment service provider Stripe. The Operator does not obtain the Contributor's full payment card details.

A contribution is deemed made once it has been successfully processed and received by the Operator. A payment confirmation may be sent electronically to the address provided during payment.

11. Recurring monthly contribution

If the Contributor selects a monthly contribution, the amount selected by them will be charged automatically at regular monthly intervals in accordance with the information displayed when confirming the payment in Stripe, until the recurring contribution is cancelled.

A monthly contribution is not a subscription to a paid version of the Application and does not provide the Contributor with any paid features or other individual benefits.

The Contributor may cancel the recurring contribution at any time through Stripe's secure customer portal, accessible via the “Manage or cancel monthly contribution” link.

When accessing Stripe's customer portal through a public link, the Contributor is verified using the email address used for the payment and a one-time code sent by Stripe.

The Contributor may also request cancellation from the Operator at support@duovio.eu .

Cancellation applies to future payments. An amount already successfully processed before cancellation is not automatically refunded solely as a result of cancellation.

12. Erroneous, duplicate, or unauthorised payments

If a contribution has been charged more than once, in an amount different from that confirmed by the Contributor, or without their consent, the Contributor should contact the Operator without undue delay at support@duovio.eu .

The notice should preferably include the email address used for payment, the date and amount of the payment, and the transaction identifier, if available. The Operator will investigate the payment and, where justified, arrange for its refund or correction.

A voluntary contribution is not an order for paid training. This does not affect the Contributor's rights under applicable law, particularly rights relating to an unauthorised, duplicate, or incorrectly executed payment.

13. Availability of the Application and external services

Operation of the Application depends in particular on the availability of funds, technical infrastructure, and services provided by external suppliers, including providers of artificial intelligence models and payment services.

The availability of the Application or a particular model may be affected in particular by:

• an outage or restriction of an external service,
• a change in a supplier's technical or commercial terms,
• discontinuation of a particular model or service,
• a security incident,
• a change in operating costs,
• legal or regulatory requirements.

The Operator may replace a particular model with another model, temporarily restrict training capacity, or suspend operation of the Application where necessary for technical, security, financial, or legal reasons.

Making a voluntary contribution does not create an entitlement to use a particular model, to uninterrupted operation of the Application, or to its availability for any specified period.

14. Changes to the digital service

The Operator may continuously repair, update, and develop the Application.

Changes may include in particular:

• user interface modifications,
• security updates,
• changes to scenarios,
• changes to artificial intelligence models,
• changes to free-use limits,
• the addition or removal of features,
• modifications necessary to comply with legal obligations.

15. Content submitted by the User

The User may submit texts, descriptions of situations, responses, and other content to the Application.

The User retains all rights to their content. To the extent necessary to operate the Application, the User grants the Operator a non-exclusive, royalty-free, worldwide licence to:

• store the content,
• process it technically,
• transmit it to contracted providers of technical and AI services,
• display it to the User,
• analyse it for the purpose of providing training and feedback,
• back it up and secure it.

This licence remains in effect only for as long as necessary to provide the service, protect the Operator's rights, and comply with legal obligations.

During training, the Application does not actively ask for real names, addresses, or other identifiers of the User or third parties. However, text submitted by the User may contain personal data if the User includes such data themselves. The User should therefore describe situations in general terms and use labels such as partner, parent, colleague, or manager.

To generate a response and evaluation, the training text is transmitted, to the extent necessary, to a contracted AI service provider. The User's email address is not added to the prompt for the AI model unless the User includes it in the text themselves.

Content is not used to train the Operator's or any third party's models, or for any other secondary purpose.

16. Protection of other persons' privacy

The User should not enter into the Application the real names, addresses, contact details, or other identifiers of persons with whom they communicate.

The use of general labels is recommended, for example:

• partner,
• parent,
• sibling,
• colleague,
• manager,
• client.

Without a lawful basis, the User must not submit:

• special categories of personal data relating to other persons,
• medical records,
• intimate photographs or recordings,
• passwords or access credentials,
• banking or payment information,
• confidential information belonging to an employer or client,
• content protected by a statutory duty of confidentiality.

The User is responsible for ensuring that they are authorised to submit content to the Application.

17. Prohibited use

In particular, the Application must not be used:

• to threaten, harass, or stalk,
• to prepare manipulation, coercion, or psychological abuse,
• to create hateful or unlawful content,
• to infringe the rights of third parties,
• to present automated output as a professional diagnosis,
• to obtain personal data without authorisation,
• to test security without the Operator's consent,
• to distribute malicious code,
• to disrupt operation of the Application,
• to download or copy content by automated means,
• to circumvent limits or security measures.

The Operator may refuse to process an input or may terminate a scenario that conflicts with these rules or with the safety rules of the AI systems used.

18. Artificial intelligence, transparency, and automated evaluation (AI Act)

The Operator ensures that, no later than at the time of the first direct interaction, the User is clearly informed that they are interacting with an artificial intelligence system. Virtual characters, suggested responses, ongoing feedback, and evaluations are generated or supported by artificial intelligence. The User is not communicating with a human, therapist, or psychologist.

The Application may automatically evaluate specific responses from the User and assign communication patterns, training attributes, or indicators of risk to them. This is a working, probabilistic, and context-limited assessment. It may be inaccurate, incomplete, or incorrect and must not be regarded as a diagnosis, clinical assessment, expert opinion, employment-related assessment, or any other professional decision.

The Application does not use biometric categorisation or emotion recognition based on biometric data. Any labelling of emotional tone is based solely on text entered by the User and forms part of the training feedback.

AI outputs are not used for automated decision-making that produces legal or similarly significant effects for the User. They do not affect employment, education, credit, insurance, healthcare, access to a public service, or any other similarly significant decision. The User may disregard the output, report it as inappropriate, or request deletion of their account and stored data.

The Operator endeavours to use AI in accordance with Regulation (EU) 2024/1689 of the European Parliament and of the Council on artificial intelligence, particularly the requirements relating to transparency, comprehensibility, human oversight, appropriate accuracy, safety, and the ability to recognise that the interaction is with an AI system.

Details regarding the processing of inputs, the AI providers used, retention of conversations, and the User's options are set out in Section 24 of these Terms and in the separate Privacy Policy.

The Application may also automatically analyse text for the purpose of detecting a potential threat to the User or another person. Such an assessment is indicative only and may be incorrect.

If a potential threat is detected, the Application may interrupt the communication training and display safety questions or contact details for crisis and emergency assistance. The Application is not continuously monitored by a person, cannot determine the actual level of danger, may not know or reliably determine the User's exact location, and cannot itself summon assistance.

19. Rights to the Application

The Application, its source code, visual design, scenarios, databases, methodology, texts, and other components created by the Operator are protected by applicable intellectual property rights.

The User is granted only a limited, non-exclusive, and non-transferable right to use the Application for their personal purposes in accordance with these Terms.

Without the Operator's prior consent, it is prohibited in particular to:

• copy or distribute the Application or any part of it,
• sell access to an account,
• create a derivative service,
• extract scenarios or data in bulk,
• reverse engineer the Application beyond the extent permitted by law,
• remove any attribution identifying the author or Operator.

20. Interruptions and maintenance

The Operator may temporarily suspend operation of the Application, particularly due to:

• scheduled maintenance,
• correction of an error,
• a security incident,
• overload,
• a supplier outage,
• an event of force majeure,
• a legal obligation.

The Operator will endeavour to provide advance notice of longer scheduled outages.

The Application is not a service with guaranteed uninterrupted availability.

21. Suspension or termination of an account

The Operator may temporarily suspend or terminate an account if the User:

• seriously or repeatedly breaches these Terms,
• circumvents limits,
• threatens the security of the service,
• infringes the rights of others,
• uses the service unlawfully,
• misuses the payment or complaints process.

Unless immediate action is necessary, the Operator will notify the User in advance and provide a reasonable opportunity to remedy the breach.

22. Termination of use by the User

The User may discontinue use of the Application at any time.

The User may delete their account through the account settings or by submitting a request to support@duovio.eu.

The retention period for data following account deletion is set out in the Privacy Policy.

23. Liability

The Operator is not liable for decisions made by the User solely on the basis of automatically generated training output or for a third party's response to wording suggested by the Application, unless the Operator caused the damage by breaching a statutory or contractual obligation.

The Operator is also not liable for obstacles caused exclusively by:

• the User's device or connection,
• the User's incompatible or outdated software,
• unauthorised interference by the User,
• a breach of these Terms,
• a third party for whom the Operator is not liable under applicable law,
• an event that could not reasonably have been foreseen or prevented.

Nothing in these Terms excludes or limits any liability that cannot be excluded or limited in relation to a consumer under applicable law.

24. Personal data protection (GDPR)

The controller of personal data is the Operator identified in Section 1 of these Terms. The Operator processes personal data in accordance with Regulation (EU) 2016/679 of the European Parliament and of the Council (GDPR), Czech law, and the principles of lawfulness, transparency, purpose limitation, data minimisation, accuracy, storage limitation, integrity, and confidentiality.

24.1 Data required for an account

For basic registration and login, the Operator requires only the User's email address. The email address is associated with an internal account identifier, account status, information on available limits, and essential login information. The Application does not require a user password; it uses a time-limited, one-time code sent by email.

During registration, the Operator does not request a first name, surname, residential address, date of birth, telephone number, gender, or other profile information. However, an email address is personal data, and use of the service is therefore not entirely anonymous from a legal perspective.

24.2 Other data generated during use

To the extent necessary, the following may also be processed:

• training texts, the User's responses, scenario history, and automatically generated training evaluations,
• operational data concerning the use of limits, request times, and features used,
• security and technical logs necessary to protect the service, such as a session identifier or IP address, where generated within the technical infrastructure,
• contribution and payment data, such as the payment email address, transaction identifier, Stripe customer identifier, recurring contribution status, and information required for accounting records,

Training text may contain additional personal or sensitive data only if the User enters such data themselves. The Application is not intended for storing medical records, the real names of third parties, exact addresses, access credentials, or other data that is not necessary for communication training.

24.3 Purposes and legal bases

Personal data may be processed in particular:

• to create an account, enable login, maintain history, and provide training — for the performance of a contract or to take steps prior to entering into a contract,
• to manage limits, prevent misuse, ensure security, diagnose errors, and protect the service — on the basis of the Operator's legitimate interests,
• to process and record contributions, manage recurring contributions, resolve erroneous or unauthorised payments, and maintain accounting records — for compliance with legal obligations and on the basis of the Operator's legitimate interests,

The email address will not be used for marketing communications. Login and service-related messages are not marketing communications and are necessary for the operation of the account.

24.4 Recipients and service providers

Personal data may, to the extent necessary, be disclosed to providers of artificial intelligence systems and payment services.

Training text is transmitted to an AI provider for the purpose of generating a response. The Operator does not add the User's email address to the AI prompt unless the User includes it directly in the text.

24.5 Retention periods

• the email address and account are retained for the lifetime of the account,
• the one-time login code and related security data are retained only for the duration of its validity,
• training history is retained for as long as the User keeps it stored in their account, or until it is deleted or the account is terminated,
• technical and security logs are retained for 30 days unless longer retention is necessary to resolve an incident,
• payment, complaints, and accounting data are retained for the period prescribed by applicable law.

24.6 User rights

Subject to the conditions laid down in the GDPR, the User has, in particular, the right to:

• obtain information and access to their personal data,
• request rectification of inaccurate data,
• request erasure of data where it is no longer necessary or there is no other legal basis for its retention,
• request restriction of processing,
• receive data in a structured, commonly used, and machine-readable format where the conditions for portability are met,
• object to processing based on a legitimate interest,
• withdraw consent where any processing is based on consent,
• lodge a complaint with the Úřad pro ochranu osobních údajů (Office for Personal Data Protection).

Requests concerning personal data may be sent to support@duovio.eu. The Operator may take reasonable steps to verify that the request is submitted by the authorised account holder.

The supervisory authority is the Úřad pro ochranu osobních údajů (Office for Personal Data Protection), Pplk. Sochora 27, 170 00 Praha 7, https://uoou.gov.cz/.

25. Complaints and communication

The User may submit questions, complaints, claims, and other communications to:

support@duovio.eu

The Operator generally communicates with the User electronically via the email address associated with the account or through notifications in the Application.

26. Alternative dispute resolution for consumer disputes

If a dispute arising from a contractual relationship relating to use of the Application or the making of a contribution arises between the Operator and a User who is a consumer and cannot be resolved directly, the User may submit an application for alternative resolution of the consumer dispute.

The competent body is:

Česká obchodní inspekce (Czech Trade Inspection Authority)
Ústřední inspektorát - oddělení ADR
Gorazdova 1969/24
120 00 Praha 2
email: adr@coi.gov.cz
website: https://www.coi.cz/informace-o-adr/

Alternative dispute resolution is governed by the rules of the competent body and applicable law.

27. Changes to the Terms

The Operator may amend these Terms to a reasonable extent, particularly due to:

• changes in applicable law,
• changes in how the Application operates,
• the introduction of new features,
• changes in payment or AI providers,
• security reasons,
• the need to clarify ambiguous provisions.

A registered User will be informed of any material change before it takes effect, by email or through the Application.

An amendment to the Terms must not retroactively impair rights already acquired by the User or Contributor.

If the User does not agree to an amendment, they may discontinue use of the Application and terminate their account.

28. Governing law

The legal relationship between the Operator and the User is governed by the laws of the Czech Republic.

Where the User is a consumer residing in another country, this does not affect any mandatory rights granted to them by the laws of their country that cannot be contractually excluded.

29. Final provisions

If any provision of these Terms is invalid or unenforceable, this does not affect the validity of the remaining provisions.

Any individual agreement concluded between the Operator and the User takes precedence over these Terms.

These Terms take effect on 21 August 2026.

Operator

The Operator of the Application is:

David Spilka
IČO: 75372096
place of business: Heřmanova 1087/10, 17000 Praha 7, EU Czechia
email: support@duovio.eu

Referred to in this document as the “Operator”.

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Model notice of withdrawal from the contract

Recipient:

support@duovio.eu

I hereby give notice that I withdraw from the contract for the provision of the following digital service:

Name of the purchased service:
Date of order:
User account email:
Date: