Terms of use

1. Who we are

The Eolin platform (the eolin.app website, the campaign app and its addresses, the teacher platform and the ambassador programme) is operated by Arwell Works s.r.o., registered office at Příčná 1892/4, Nové Město, 110 00 Prague 1, Czech Republic, entered in the Commercial Register kept by the Municipal Court in Prague, section C, file 458253, company ID (IČO) 302 09 781 ("Arwell", "we"). Contact: privacy@arwell.works. You will find further details in the Company information document.

2. Who these terms apply to

These terms govern the relationship between Arwell and everyone who uses Eolin ("user", "you"): website visitors, students in campaigns, teachers and ambassadors. Taking part in a particular campaign is also governed by the Campaign rules and by the rules of that campaign, which are issued by its organiser. The processing of personal data is described in the Student privacy notice and the Account privacy notice.

3. Conclusion and duration of the contract

Someone who only browses the public eolin.app website does not conclude the contract of use; for them, these terms are only the rules for using the website. The contract of use is concluded for a student by joining a campaign and confirming these terms and the campaign rules, and for a teacher or ambassador by creating an account and confirming these terms. The service is free of charge; you pay for it neither with money nor with any other consideration, and it contains no purchases.

A student may conclude this contract on their own, because it is free of charge, contains no purchases and is appropriate to their age (Section 31 of the Czech Civil Code). Confirming these terms is not consent to the processing of personal data; that processing is described in the Student privacy notice and the Account privacy notice and has its own legal basis.

The contract is concluded for an indefinite period and ends when the account or profile is deleted (by you, or automatically under the Data retention and deletion document).

4. Age and minors

Students of participating schools may play in a campaign regardless of age; this is an ordinary, age-appropriate educational activity. The ambassador programme and the e-mail reminder are available from the age of 15 in the Czech Republic and from the age of 16 in Slovakia. A teacher account is intended only for teachers over 18. Parents will find information in the Age and information for parents document.

5. Accounts and signing in

• You sign in to a teacher or ambassador account with a one-time code sent by e-mail. Protect access to your mailbox; do not pass codes on to anyone.
• An account is personal, and you may not share or transfer it.
• Provide truthful information, in particular about your school. A teacher may only use an e-mail address to which they have authorised access.
• A student's game profile is tied to the browser and device; a lost profile cannot be restored.

6. Rules of conduct

In particular, it is prohibited to:

• create more than one profile or account per person, impersonate someone else, or give a false school or class;
• use scripts, bots or other automated tools, circumvent time limits or security, or exploit bugs;
• interfere with the operation of the service, or try to gain access to other people's data or to non-public parts of the system;
• share correct quiz answers or otherwise breach fair play under the Campaign rules;
• send content through Eolin that is unlawful, offensive or hateful, or that infringes the rights of others.

Please report a bug or security weakness to us at privacy@arwell.works, and do not exploit it. We will not take any action against you on our part for reporting in good faith.

7. Teachers

The teacher platform is used to involve your school in campaigns: content preview, the printing status of QR codes and the school's aggregate results. Use the aggregate results only for the school's purposes. By confirming that the QR codes have been put up, you declare that you have actually put the codes up at the school, or arranged for them to be put up with the school's consent.

8. Ambassadors

An ambassador helps spread the campaign, for example by inviting classmates or putting up QR codes. Taking part is voluntary and unpaid, and does not create an employment or any similar relationship. An ambassador may put up QR codes only where the school allows it. You can leave the ambassador programme at any time.

Ideas. If you send us an idea or suggestion, you grant us, free of charge, a non-exclusive permission to use and adapt it to improve Eolin and its campaigns, without territorial limitation, for the duration of the economic copyright. We do not name the author, to protect your identity; if you want to be named, write to us. Do not send us anything you do not hold the rights to, or other people's personal data.

9. Content and intellectual property

• Campaign content (quizzes, texts, videos, archive footage, images) belongs to the campaign organisers or their licensors. The organiser of a campaign is responsible for the accuracy and lawfulness of its content.
• The Eolin platform, its software, design, brand and website texts belong to Arwell.
• You may view the content and share links to it for personal and school purposes. Without the owner's consent, you may not copy, modify, distribute or use it for commercial purposes, unless the law permits it (e.g. quotation or teaching).
• A partner's commercial communication in a campaign is always clearly labelled.
• Links to third-party websites are provided for information; we are not responsible for their content.

10. Availability and changes to the service

We operate Eolin with professional care, but we cannot guarantee uninterrupted and error-free availability. We may develop or change the service or discontinue some features; during a running campaign we will not do so to the detriment of participants without a serious reason. We will give notice of planned maintenance where possible.

11. Suspension and termination

You can delete your account or profile at any time. In the event of a serious breach of these terms or of the campaign rules, we may suspend or cancel an account. We will tell you the reason, unless the law or security prevents it, and you can object to the decision via the contact in section 1; a person will review it. In urgent cases (e.g. an attack on the service), we may restrict access immediately.

12. Liability

We are liable for damage in accordance with the law. Because the service is free of charge, to the extent permitted by law we are not liable for the loss of a game profile caused by deleting data in the browser, for outages on the user's side or of their connection, for short-term unavailability of the service, or for the content of third-party websites. This in no way limits our liability for damage caused intentionally or through gross negligence, for harm to life, health and other natural rights of a person, or any rights that cannot be limited by contract for you as a consumer.

13. Changes to the terms

We may change these terms only for the following reasons: introducing a new feature or changing an existing one, a change in the law or a decision of a public authority, keeping the service secure, or clarifying unclear wording. We will publish the change here with its effective date at least 14 days in advance; we will notify account holders by e-mail or when they sign in, and students in the app. You do not have to agree to the change; in that case you may end the contract free of charge at any time before the change takes effect by deleting your account or profile. A change has no retroactive effect. For a running campaign, the rules in section 11 of the Campaign rules apply.

14. Complaints and dispute resolution

Please address any complaint to the contact in section 1; we will reply without undue delay and within 30 days at the latest. If a dispute arises between us and a consumer that cannot be settled by agreement, the consumer may file a request for out-of-court resolution of a consumer dispute with the Czech Trade Inspection Authority (Česká obchodní inspekce, adr.coi.cz), which also handles disputes with consumers from other EU states. A consumer from Slovakia may also turn to the European Consumer Centre in the Slovak Republic (esc-sr.sk), which helps free of charge with disputes with traders from other Member States. This does not affect the right to go to court.

15. Governing law and language

These terms are governed by the law of the Czech Republic. If a user is a consumer resident in another state, they do not thereby lose the protection afforded to them by the mandatory provisions of that state's law, and they may bring proceedings before the courts of their place of residence. The Czech version is binding for users in the Czech Republic and the Slovak version for users in Slovakia. For users from other states the Czech version is binding; the English and other translations are provided for information. This does not affect the mandatory consumer-protection provisions of the user's state of residence.

16. Reporting illegal content and moderation

Users can store only a little of their own content on Eolin (e.g. ambassadors' ideas, free-text survey answers, teacher profile data), and none of it is shown publicly. You can report illegal content to us at privacy@arwell.works. State what the content is and where it is, why you consider it illegal, your name and e-mail address (not required for content concerning child sexual abuse or other serious criminal offences), and a statement that you are reporting in good faith. We will confirm receipt and tell you the outcome. Decisions to restrict content or an account are always taken by a person. If we restrict content or an account, we will tell the user concerned the specific reason, the provision of these terms on which the decision is based, and how to object (section 11). A person will review the objection free of charge, where possible someone other than the person who decided. This does not affect the rights under section 14 or the right to go to court.

17. Point of contact

Single point of contact for users and authorities under Articles 11 and 12 of Regulation (EU) 2022/2065 (Digital Services Act): privacy@arwell.works. We communicate in Czech, Slovak and English.

These terms take effect on 16 October 2026.