Terms of use

These terms of use ("Terms") form a legally binding agreement between you and ANKT SERVICES, a French simplified joint-stock company (SAS) registered under SIREN 843902156, with its registered office at 25 Rue Lenepveu, c/o WeForge, 49100 Angers, France("we", "us", "our"). They govern your access to and use of the chesstactics website, mobile applications and related services (together, the "Service").

By using the Service you accept these Terms. If you do not agree with them, do not use it. They incorporate by reference our privacy policy and, for purchases, our terms of sale.

• "Account": the personal account that stores your progress across devices.
• "Service": the chesstactics platform, website, web application, mobile applications and related services.
• "Lifetime unlock": the one-time purchase that opens every journey section, including those added later, for as long as the Service is operated.
• "Content": the journeys, lessons, puzzles, explanations, text, graphics and software available through the Service.

chesstactics is a chess tactics trainer. It teaches tactical motifs on a path, serves rated puzzles at your level, and offers timed puzzle sprints. It can also read the public game history of a Lichess or Chess.com account you name, analyse it with a chess engine, and show you the tactics you missed.

A free tier is available. The lifetime unlock opens the rest of the catalogue, as described on the pricing page. What is in each tier may change over time, and features may differ between the web and the mobile app.

Training results vary from person to person. We do not guarantee any particular improvement in your rating, your results or your play.

There is one paid product and it is bought once: a personal, non-transferable licence to the full catalogue for as long as the Service runs. It has no billing cycle, it never renews, and it does not promise that the Service will exist forever.

On the web the payment is processed by Stripe. In the mobile apps it is processed by Apple or Google as an in-app purchase, under their terms. Apple and Google require their own billing for digital content, so the same unlock is sold on two rails. Either receipt unlocks the same account. The conditions of purchase, including withdrawal and refunds, are in the terms of sale.

We may change the price or what the unlock includes. A change never affects an unlock already bought.

You agree not to:

• use the Service in breach of any applicable law
• scrape, crawl or bulk-extract the Content or the data, or use automated tools against the Service without our written permission
• attack, overload, probe or disrupt the Service, its API or its infrastructure
• manipulate XP, levels, streaks, achievements or the leaderboard, including by submitting falsified results
• try to reach another user's account or data
• impersonate us or anyone else, or misrepresent your affiliation
• upload or transmit malicious code
• share your account, or use the Service to run a competing commercial service

We may suspend or close accounts that breach this section (see section 14).

chesstactics is a training tool, not an assistant. Consulting it during a live rated game breaks the rules of every chess platform and is not what it is for. We may close an account used that way, and we will co-operate with a platform that asks about one.

The Service relies on the following providers:

• Stripe: payment processing on the web.
• Apple App Store, Google Play and RevenueCat: distribution and in-app purchases for the mobile apps.
• Supabase: authentication and database hosting.
• Vercel: hosting and content delivery.
• Resend: email delivery.
• Web3Forms: the contact form.
• Google and Apple: optional sign-in.
• Lichess and Chess.com: public game data for the scan, and the Lichess puzzle database (CC0) that the puzzles come from.
• PostHog and Sentry: analytics and crash reporting in the mobile app.

Your use of a third-party service is governed by its own terms and privacy policy, and we are not responsible for services we do not control. What each one processes is set out in our privacy policy.

THE SERVICE IS PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS. TO THE FULLEST EXTENT PERMITTED BY LAW WE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED OR ERROR-FREE, NOR THAT EVERY RECOMMENDED MOVE OR ENGINE EVALUATION IS CORRECT IN EVERY POSITION.

This section does not limit any warranty that cannot be excluded under mandatory consumer law, including the legal guarantee of conformity in section 13.

TO THE FULLEST EXTENT PERMITTED BY LAW WE ARE NOT LIABLE FOR INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR PUNITIVE DAMAGES, NOR FOR LOSS OF PROFITS, DATA OR GOODWILL, ARISING FROM THE SERVICE, INCLUDING LOST RATING POINTS. OUR TOTAL AGGREGATE LIABILITY FOR ALL CLAIMS RELATING TO THE SERVICE IS LIMITED TO THE GREATER OF (A) WHAT YOU PAID US IN THE TWELVE (12) MONTHS BEFORE THE EVENT GIVING RISE TO THE CLAIM OR (B) ONE HUNDRED EUROS (EUR 100).

These limits do not apply to our gross negligence or wilful misconduct, to death or personal injury caused by our negligence, to fraud, or to anything that cannot be limited under applicable law. Nothing here limits your statutory rights as a consumer.

You agree to indemnify and hold harmless ANKT SERVICES and its officers, employees and agents against claims, damages and reasonable costs (including legal fees) arising from your breach of these Terms or your unlawful use of the Service. This does not apply where mandatory consumer law prohibits it.

If you are a consumer in the European Union you have a fourteen (14) day right of withdrawal on a purchase, and the legal guarantee of conformity for digital content and services under Directive (EU) 2019/770 as implemented where you live. How that works in practice, including our refund policy, is in the terms of sale.

You can stop using the Service at any time and delete your account from Settings, on the web or in the app. We may suspend or close your access, with notice where practicable, if you materially breach these Terms, abuse the Service, or where the law requires it. If we close your access without cause while you hold a lifetime unlock, we will refund it. Sections that by their nature survive termination (6, 10, 11, 12 and 15) survive.

Deleting your account removes your profile and training data as described in the privacy policy; billing records are kept as long as the law requires.

These Terms are governed by French law, without prejudice to the mandatory consumer-protection rules of the country where you live. Before taking any legal step, please write to hello@chesstactics.app so we can try to sort it out directly.

Consumers in France may also use free consumer mediation (Articles L.611-1 et seq. of the French Consumer Code); ask us and we will give you the details of the applicable mediator. Disputes that cannot be settled amicably fall to the French courts, except where mandatory rules let you sue where you live.

We may update these Terms. For a material change we give at least thirty (30) days' notice, by publishing the new version with a new date and, if you have an account, by email or a notice in the product. Continuing to use the Service after the change takes effect is acceptance; if you do not agree, stop using it.

If a provision of these Terms is held invalid, the rest stays in force and the invalid provision is replaced by a valid one as close as possible to its intent. Not enforcing a provision is not a waiver of it. You may not assign these Terms without our consent; we may assign them to a successor of the Service. These Terms, with the privacy policy and the terms of sale, are the whole agreement between us about the Service.

Questions about these Terms go to hello@chesstactics.app or through the contact page.