Terms of Service for Sideris

Effective Date: 7 October 2026

Welcome to Sideris. These Terms of Service explain the rules for using the Sideris mobile application, published under the name Sideris Studio by Loris BERT EI ("we", "us"), a French sole proprietorship (micro-entreprise). By downloading or using Sideris, you agree to these Terms.

1. The Service

Sideris is an offline-first astronomy application that identifies the region of sky shown in a photograph, such as a picture of the night sky or of a camera's screen, and displays the result on an interactive sky map. Plate-solving runs locally on your device. Results are generated automatically and are provided for hobbyist and educational use. They are approximate and should not be relied upon for navigation or any safety-critical purpose.

2. Free Trial and Purchase

Sideris is free to try. New users receive a limited number of free plate-solving credits so you can experience the app before deciding to buy. Once your free credits are used up, a single one-time purchase unlocks the full version of Sideris and gives you unlimited plate solving. Sideris is not a credit-based service: the free credits exist only to provide a trial, and no further credits are ever required once you own the app.

3. Licence

We grant you a personal, non-exclusive, non-transferable licence to use Sideris on the devices you own or control, within the usage rules of the store you obtained it from. You may not rent, lend, sell or redistribute the application.

4. Payments

All purchases are processed securely by the Apple App Store or the Google Play Store. Sideris never sees or stores your payment card information. Purchases are final except where a refund is required by applicable law or granted under the store's own policies, which govern all transactions.

5. Acceptable Use

You agree to use Sideris only for lawful purposes, and not to disrupt, reverse-engineer for redistribution, or otherwise misuse the app or its data beyond what applicable law permits.

6. Intellectual Property

Sideris, its design, and its original content are owned by Loris BERT EI. Astronomical catalog data and imagery may be provided by third parties under their respective licences; attributions are listed in the Credits section of the app.

7. Warranties and Your Statutory Rights

Sideris is provided as it is. We do not warrant that plate solving will always succeed or that its results will be accurate, and, to the extent permitted by law, we give no warranty beyond those that the law imposes.

Nothing in these Terms limits the rights you have as a consumer under the law of the country where you live, in particular the legal guarantee of conformity for digital content. If the application does not work as described, contact us and we will repair it or, where that is not possible, refund your purchase as the law provides.

8. Limitation of Liability

To the maximum extent permitted by law, we shall not be liable for any indirect damage arising from your use of, or inability to use, the app. This section does not limit any liability that cannot be limited by law, including our liability toward consumers.

9. Apple App Store

If you obtained Sideris from the Apple App Store, the following also applies:

• These Terms are concluded between you and us only, and not with Apple. We, and not Apple, are solely responsible for Sideris and its content.
• Your licence is limited to use on Apple-branded products that you own or control, as permitted by the Usage Rules set out in the Apple Media Services Terms and Conditions.
• We, and not Apple, are solely responsible for providing any maintenance and support for Sideris. Apple has no obligation to provide any maintenance or support services.
• If Sideris fails to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price, if any. To the maximum extent permitted by law, Apple has no other warranty obligation with respect to Sideris.
• We, and not Apple, are responsible for addressing any claims by you or any third party relating to Sideris or your possession and use of it, including product liability claims, claims that it fails to conform to any applicable legal or regulatory requirement, and claims arising under consumer protection, privacy or similar legislation.
• In the event of any third-party claim that Sideris or your possession and use of it infringes that third party's intellectual property rights, we, and not Apple, are solely responsible for the investigation, defence, settlement and discharge of that claim.
• You represent that you are not located in a country subject to a United States Government embargo, or designated by the United States Government as a "terrorist supporting" country, and that you are not listed on any United States Government list of prohibited or restricted parties.
• You must comply with any applicable third-party terms when using Sideris.
• Apple and its subsidiaries are third-party beneficiaries of these Terms and, upon your acceptance of them, will have the right to enforce these Terms against you as a third-party beneficiary.
• Questions, complaints or claims about Sideris should be addressed to us at [email protected].

10. Changes to These Terms

We may update these Terms periodically. Any change is reflected in the "Effective Date" at the top of this document, and the current version is always available inside the app, under Settings. Continued use of Sideris after changes take effect constitutes acceptance of the revised Terms.

11. Governing Law and Disputes

These Terms are governed by French law. If you are a consumer living in another country, you also keep the protection of the mandatory provisions of the law of that country. In the event of a dispute, please contact us first so that we can look for a solution together. Failing that, you may bring the dispute before the courts that have jurisdiction under the applicable law, which, for a consumer, include the courts of the place where you live.

12. Contact

For any question about these Terms, contact us at [email protected].