Atoms-World Licence Agreement
The end-user licence agreement (EULA) of each version.
Atoms-World for iOS — End-User License Agreement
Last updated: 29 September 2026
This End-User License Agreement ("Agreement") is between you and Alexandre Tkatchenko, 8 Rue Jean Fries, 3321 Berchem, Luxembourg ("Licensor", "we", "us"). The App is a private, independent project developed by Igor Poltavskyi, Sergio Suárez-Dou, Miguel Gallegos Gonzalez and Alexandre Tkatchenko. This Agreement governs your use of the Atoms-World application for iOS — its games (Fix the Molecule, Binding Dimer Duel, Sounds of Nature), the machine-learning force field, molecule data, spectra, texts, translations, graphics, sounds and any updates (together, the "App").
By downloading, installing or using the App you agree to this Agreement. If you do not agree, do not install or use the App. If you are under the age of majority where you live, a parent or legal guardian must accept this Agreement for you.
1. License grant
The App is licensed, not sold. Subject to this Agreement, we grant you a free-of-charge, personal, non-exclusive, non-transferable, non-sublicensable, revocable license to install and use the App on iOS devices you own or control, for personal, educational and non-commercial purposes.
Teachers and educational institutions may use the App in lessons, including showing it to students in class. Each user must obtain the App from its official store listing (Section 3).
2. Restrictions
Except where Section 5 or applicable law expressly allows it, you may not, and may not help anyone else to:
- copy the App, except as needed to install and use it under Section 1;
- modify, adapt, translate or create derivative works of the App or any part of it;
- distribute, publish, sell, rent, lease, lend, sublicense or otherwise make the App available to others, including by uploading its installation file (IPA) or its contents to any website, file-sharing service, alternative app store or other channel;
- decompile, disassemble or reverse-engineer the App, except to the extent that mandatory law (such as Articles 5 and 6 of EU Directive 2009/24/EC) allows it despite this restriction;
- extract, reuse or redistribute the App's model files, curated molecule data, spectra, texts or other assets, separately or as part of another product — except third-party components under their own licenses (Section 5);
- use the App or its content to develop, train or test a competing product or any machine-learning model;
- remove, hide or change any copyright, trademark or other proprietary notice in the App;
- get around any technical protection in the App, or use it in a way that breaks applicable law.
Screenshots and recordings. You may take screenshots or screen recordings of the App and share them for non-commercial educational purposes, such as worksheets, presentations or class materials, credited as "Atoms-World © Alexandre Tkatchenko". Any other use needs our prior written permission.
3. Official distribution
The App for iOS is distributed only through the Apple App Store under our own developer account, or through other channels we authorise in writing. Copies obtained anywhere else are unauthorised, may have been tampered with, and this Agreement grants no rights to use them.
4. Ownership
The App and all intellectual property rights in it belong to the Licensor or its licensors, including the software, the converted model files, the curated molecule data, the texts, translations, designs and the name and logo "Atoms-World". Only the rights expressly granted in Section 1 are licensed to you; all other rights are reserved. Nothing in this Agreement gives you any right to use our names, logos or trademarks.
5. Third-party components
The App includes open-source software, a machine-learned model and molecule data from third parties. Their own licenses govern them; they are listed with their license texts in the App under About (the ⓘ button on the start screen) → Open-source licenses and in the Third-Party Notices that come with the App. Where a third-party license gives you rights in a component that this Agreement would otherwise restrict, the third-party license applies to that component, and Section 2 does not limit those rights.
6. Educational and scientific nature
The App is an educational tool. Its energies, forces, structures, binding scores and spectra come from an approximate machine-learned force field and simplified physics, computed on your device. They may be inaccurate or incomplete. Do not rely on them for laboratory work, safety, medical, industrial, regulatory or other real-world decisions, or as a replacement for professional scientific advice or supervised experiments. The notes about medicines describe what the molecules are used for; they are not medical advice.
7. Privacy and permissions
The App collects no personal data, has no accounts, no analytics and no advertising. The App asks for the following device permission and uses it only for the feature you are using:
- Microphone — only while Listen to music is on in Sounds of Nature, so the molecule can move to music playing nearby. iOS asks for your permission first.
You can refuse or withdraw this permission at any time in your device settings; the feature that needs it then stops working. Sound is analysed on your device in real time and never recorded, stored or sent anywhere. Videos you play from YouTube come from YouTube, whose own terms and privacy policy apply to them. Details: our Privacy Policy at https://atoms-world.online/privacy, also shown in the App.
8. Updates, support and availability
We may update, change, suspend or discontinue the App or any feature at any time without notice. We do not have to provide maintenance, support or updates. Updates are covered by this Agreement unless they come with separate terms.
9. No warranty
The App is provided free of charge, "as is" and "as available". To the maximum extent permitted by applicable law, we disclaim all warranties, express or implied, including warranties of merchantability, fitness for a particular purpose, accuracy, non-infringement, and that the App will be uninterrupted, error-free or free of harmful components.
10. Limitation of liability
To the maximum extent permitted by applicable law, the Licensor, the developers named above, contributors and licensors are not liable for any indirect, incidental, special, consequential or punitive damages, or for loss of data, profits or goodwill, arising from or related to the App or this Agreement. Because the App is free of charge, our total liability for all claims is limited to EUR 50 (fifty euros).
Nothing in this Agreement limits or excludes liability for death or personal injury caused by negligence, for fraud, for intentional misconduct or gross negligence, or any other liability that cannot be limited or excluded under applicable law. If you are a consumer, this Agreement does not affect your mandatory statutory rights.
11. Termination
This Agreement lasts until it is terminated. Your rights under it end automatically if you break it. You may end it at any time by deleting the App. When it ends, you must stop using the App and delete all copies. Sections 2, 4, 5, 6, 9, 10, 12, 13 and 14 continue to apply after termination.
12. Export and legal compliance
You confirm that you are not located in a country subject to a European Union, United Nations or United States government embargo, and that you are not on any EU, UN or US list of prohibited or restricted parties. You will comply with all applicable export-control and sanctions laws when using the App.
13. Additional terms for Apple App Store users
- This Agreement is between you and the Licensor only, not Apple Inc. ("Apple"). The Licensor, not Apple, is solely responsible for the App and its content.
- Your license is limited to using the App on Apple-branded products that you own or control, as allowed by the Usage Rules in the Apple Media Services Terms and Conditions. Other accounts associated with you through Family Sharing or volume purchasing may also access and use the App.
- Apple has no obligation to provide maintenance or support services for the App.
- If the App does not conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price (if any) for the App. To the maximum extent permitted by law, Apple has no other warranty obligation for the App. The Licensor is responsible for any other claims, losses, liabilities, damages, costs or expenses caused by a failure to conform to a warranty, to the extent such a warranty cannot be disclaimed under applicable law.
- The Licensor, not Apple, is responsible for handling any claims by you or a third party relating to the App or your possession or use of it, including (a) product liability claims, (b) claims that the App fails to meet a legal or regulatory requirement, and (c) claims under consumer protection, privacy or similar laws.
- If a third party claims that the App or your possession or use of it infringes their intellectual property rights, the Licensor, not Apple, is solely responsible for investigating, defending, settling and discharging that claim.
- You must comply with any applicable third-party terms of agreement when using the App.
- Apple and its subsidiaries are third-party beneficiaries of this Agreement. Once you accept it, Apple has the right, and is deemed to have accepted the right, to enforce this Agreement against you as a third-party beneficiary.
Questions, complaints and claims about the App go to the Licensor at the contact details in Section 15.
14. General
- Changes. We may update this Agreement. The current version is always available in the App (About (the ⓘ button on the start screen) → Licence agreement (EULA)). We will make any updated version available in the App before it takes effect. If you keep using the App after a change takes effect, you accept the updated Agreement.
- Governing law and courts. This Agreement is governed by the laws of the Grand Duchy of Luxembourg, excluding its conflict-of-law rules. The courts of Luxembourg City have jurisdiction. If you are a consumer, you also keep the protection of the mandatory laws of your country of residence and may bring proceedings in its courts.
- Severability. If any provision is held invalid or unenforceable, it is limited to the minimum extent necessary, and the rest of the Agreement stays in effect.
- No waiver. If we do not enforce a provision, that does not waive our right to enforce it later.
- Assignment. You may not transfer this Agreement. We may transfer it to a successor.
- Entire agreement. This Agreement, together with the Privacy Policy and the third-party licenses referred to in Section 5, is the entire agreement between you and us about the App.
- Language. If this Agreement is translated, the English version prevails where the law permits.
15. Contact
Alexandre Tkatchenko
8 Rue Jean Fries, 3321 Berchem, Luxembourg
contact@atoms-world.online
Atoms-World © 2026 Alexandre Tkatchenko. All rights reserved.
Atoms-World for Android — End-User License Agreement
Last updated: 29 September 2026
This End-User License Agreement ("Agreement") is between you and Alexandre Tkatchenko, 8 Rue Jean Fries, 3321 Berchem, Luxembourg ("Licensor", "we", "us"). The App is a private, independent project developed by Igor Poltavskyi, Sergio Suárez-Dou, Miguel Gallegos Gonzalez and Alexandre Tkatchenko. This Agreement governs your use of the Atoms-World application for Android — its games (Fix the Molecule, Binding Dimer Duel, Sounds of Nature), the machine-learning force field, molecule data, spectra, texts, translations, graphics, sounds and any updates (together, the "App").
By downloading, installing or using the App you agree to this Agreement. If you do not agree, do not install or use the App. If you are under the age of majority where you live, a parent or legal guardian must accept this Agreement for you.
1. License grant
The App is licensed, not sold. Subject to this Agreement, we grant you a free-of-charge, personal, non-exclusive, non-transferable, non-sublicensable, revocable license to install and use the App on Android devices you own or control, for personal, educational and non-commercial purposes.
Teachers and educational institutions may use the App in lessons, including showing it to students in class. Each user must obtain the App from its official store listing (Section 3).
2. Restrictions
Except where Section 5 or applicable law expressly allows it, you may not, and may not help anyone else to:
- copy the App, except as needed to install and use it under Section 1;
- modify, adapt, translate or create derivative works of the App or any part of it;
- distribute, publish, sell, rent, lease, lend, sublicense or otherwise make the App available to others, including by uploading its installation file (APK or AAB) or its contents to any website, file-sharing service, alternative app store or other channel;
- decompile, disassemble or reverse-engineer the App, except to the extent that mandatory law (such as Articles 5 and 6 of EU Directive 2009/24/EC) allows it despite this restriction;
- extract, reuse or redistribute the App's model files, curated molecule data, spectra, texts or other assets, separately or as part of another product — except third-party components under their own licenses (Section 5);
- use the App or its content to develop, train or test a competing product or any machine-learning model;
- remove, hide or change any copyright, trademark or other proprietary notice in the App;
- get around any technical protection in the App, or use it in a way that breaks applicable law.
Screenshots and recordings. You may take screenshots or screen recordings of the App and share them for non-commercial educational purposes, such as worksheets, presentations or class materials, credited as "Atoms-World © Alexandre Tkatchenko". Any other use needs our prior written permission.
3. Official distribution
The App for Android is distributed only through Google Play under our own developer account, or through other channels we authorise in writing. Copies obtained anywhere else are unauthorised, may have been tampered with, and this Agreement grants no rights to use them.
4. Ownership
The App and all intellectual property rights in it belong to the Licensor or its licensors, including the software, the converted model files, the curated molecule data, the texts, translations, designs and the name and logo "Atoms-World". Only the rights expressly granted in Section 1 are licensed to you; all other rights are reserved. Nothing in this Agreement gives you any right to use our names, logos or trademarks.
5. Third-party components
The App includes open-source software, a machine-learned model and molecule data from third parties. Their own licenses govern them; they are listed with their license texts in the App under Settings · About → Open-source licenses and in the Third-Party Notices that come with the App. Where a third-party license gives you rights in a component that this Agreement would otherwise restrict, the third-party license applies to that component, and Section 2 does not limit those rights.
6. Educational and scientific nature
The App is an educational tool. Its energies, forces, structures, binding scores and spectra come from an approximate machine-learned force field and simplified physics, computed on your device. They may be inaccurate or incomplete. Do not rely on them for laboratory work, safety, medical, industrial, regulatory or other real-world decisions, or as a replacement for professional scientific advice or supervised experiments. The notes about medicines describe what the molecules are used for; they are not medical advice.
7. Privacy and permissions
The App collects no personal data, has no accounts, no analytics and no advertising. The App asks for the following device permissions and uses each only for the feature you are using:
- Microphone — only while Listen to music is on in Sounds of Nature, so the molecule can move to music playing nearby. Android asks for your permission first.
- Music from other apps (Android 10 and later) — only while you use this Sounds of Nature option: Android's own capture consent lets the App hear the sound other apps play. The screen is never captured. A notification with a Stop button is shown while it runs.
- Notifications — only for that ongoing "listening" notification.
- Vibration — haptic feedback in the games.
- Internet — only to play a YouTube video you choose in Sounds of Nature.
You can refuse or withdraw any permission at any time in your device settings; the feature that needs it then stops working. Sound is analysed on your device in real time and never recorded, stored or sent anywhere. Videos you play from YouTube come from YouTube, whose own terms and privacy policy apply to them. Details: our Privacy Policy at https://atoms-world.online/privacy, also shown in the App.
8. Updates, support and availability
We may update, change, suspend or discontinue the App or any feature at any time without notice. We do not have to provide maintenance, support or updates. Updates are covered by this Agreement unless they come with separate terms.
9. No warranty
The App is provided free of charge, "as is" and "as available". To the maximum extent permitted by applicable law, we disclaim all warranties, express or implied, including warranties of merchantability, fitness for a particular purpose, accuracy, non-infringement, and that the App will be uninterrupted, error-free or free of harmful components.
10. Limitation of liability
To the maximum extent permitted by applicable law, the Licensor, the developers named above, contributors and licensors are not liable for any indirect, incidental, special, consequential or punitive damages, or for loss of data, profits or goodwill, arising from or related to the App or this Agreement. Because the App is free of charge, our total liability for all claims is limited to EUR 50 (fifty euros).
Nothing in this Agreement limits or excludes liability for death or personal injury caused by negligence, for fraud, for intentional misconduct or gross negligence, or any other liability that cannot be limited or excluded under applicable law. If you are a consumer, this Agreement does not affect your mandatory statutory rights.
11. Termination
This Agreement lasts until it is terminated. Your rights under it end automatically if you break it. You may end it at any time by deleting the App. When it ends, you must stop using the App and delete all copies. Sections 2, 4, 5, 6, 9, 10, 12, 13 and 14 continue to apply after termination.
12. Export and legal compliance
You confirm that you are not located in a country subject to a European Union, United Nations or United States government embargo, and that you are not on any EU, UN or US list of prohibited or restricted parties. You will comply with all applicable export-control and sanctions laws when using the App.
13. Additional terms for Google Play users
- This Agreement is between you and the Licensor only, not Google LLC or its affiliates ("Google"). The Licensor, not Google, is solely responsible for the App and its content.
- Your use of Google Play is also governed by the Google Play Terms of Service. If they conflict with this Agreement on the use of Google Play itself, they prevail.
- Google has no obligation to provide maintenance or support services for the App.
Questions, complaints and claims about the App go to the Licensor at the contact details in Section 15.
14. General
- Changes. We may update this Agreement. The current version is always available in the App (Settings · About → Licence agreement (EULA)). We will make any updated version available in the App before it takes effect. If you keep using the App after a change takes effect, you accept the updated Agreement.
- Governing law and courts. This Agreement is governed by the laws of the Grand Duchy of Luxembourg, excluding its conflict-of-law rules. The courts of Luxembourg City have jurisdiction. If you are a consumer, you also keep the protection of the mandatory laws of your country of residence and may bring proceedings in its courts.
- Severability. If any provision is held invalid or unenforceable, it is limited to the minimum extent necessary, and the rest of the Agreement stays in effect.
- No waiver. If we do not enforce a provision, that does not waive our right to enforce it later.
- Assignment. You may not transfer this Agreement. We may transfer it to a successor.
- Entire agreement. This Agreement, together with the Privacy Policy and the third-party licenses referred to in Section 5, is the entire agreement between you and us about the App.
- Language. If this Agreement is translated, the English version prevails where the law permits.
15. Contact
Alexandre Tkatchenko
8 Rue Jean Fries, 3321 Berchem, Luxembourg
contact@atoms-world.online
Atoms-World © 2026 Alexandre Tkatchenko. All rights reserved.