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Terms of Use

Effective date: November 5, 2026

This is an English translation of our Allgemeine Geschäftsbedingungen. If the two differ, the German version prevails.

1. Scope and provider

These terms apply to the iOS apps checkst and teckst, the checkst account and the website checkst.app. The provider is Magnus Ohle, Haaggasse 10, 72070 Tübingen, Germany, email [email protected] (see Impressum).

Apple's Standard License Agreement (EULA) also governs downloading the apps from the App Store. Where they conflict, these terms prevail to the extent the EULA allows.

2. Services

2.1 checkst

  • Create and manage flashcards and decks, study with spaced repetition (FSRS)
  • Import and export Anki files (.apkg, .colpkg), deck gallery
  • AI card creation: on device with Apple Intelligence or with your own OpenAI key
  • Sync via iCloud
  • Study groups with invite link or QR code, shared decks and lectures, group and global leaderboards
  • Frost (streak protection), which you can gift to group members; Frost cannot be bought
  • With Pro: sync via your checkst account

2.2 teckst

  • Record lectures; transcription runs on the device
  • Notes from the transcript: on device with Apple Intelligence or with your own OpenAI key
  • Turn slides, lecture notes and photos into text, formula recognition (the model is downloaded on first use)
  • Optional: share lecture notes and slides with a checkst study group (audio is never uploaded)

teckst is free and has no in-app purchases.

2.3 Free and Pro

Everything is free, including iCloud sync, study groups, sharing in groups, leaderboards, Frost and AI features. Pro unlocks one thing only: sync via your checkst account. Uploads to groups have technical limits against abuse (for example number and size).

AI-generated cards and notes can contain mistakes. Check them before you study with them. We do not promise any particular learning result.

3. Account

The apps work without an account. Groups, leaderboards, sharing and Pro sync need a free checkst account; teckst uses the same account. By registering you accept these terms, in particular the community rules in section 6. Keep your credentials secret. Choose a username that does not insult anyone or impersonate someone else; it is visible in groups and on the global leaderboard.

You can delete your account at any time in the app (checkst: Profile › Settings › Account) or by email. What is deleted and what stays in groups is set out in section 5.2 and in the Privacy Policy.

4. Pro subscription

  • What you get: sync of your collection via your checkst account.
  • Term: 6 months.
  • Price: €4.99 incl. VAT per 6 months. The price shown by the App Store before purchase applies (in other countries possibly in local currency).
  • Renewal: the subscription renews automatically for another 6 months at the then current price unless you cancel at least 24 hours before the period ends.
  • Cancellation: at any time, effective at the end of the current period, in your Apple ID subscription settings (Settings › your name › Subscriptions). Deleting the app or your account does not cancel the subscription.
  • Purchase, payment, refunds: you buy the subscription in the App Store. Apple is the seller; payment, billing, withdrawal and refunds are governed by Apple's terms. Request refunds at reportaproblem.apple.com.
  • Price changes are announced through Apple; where Apple requires your consent, the subscription ends at the end of the period if you do not consent.

5. Your content

5.1 Rights

You retain your copyright. You grant us the simple, royalty-free rights we need to store, transmit and display your content as far as you use the respective feature (sync, sharing, preview links). When you upload a deck, a lecture or slides to a study group, all members of that group may view, download and use it for their own studying. Only upload content you have the rights to; your lecturers' slides and scripts usually do not belong to you.

5.2 Group content after leaving or deleting your account

Content you uploaded to a group stays with the group when you leave it or delete your account and the group continues with other members. It is then assigned to the group owner (or to the member who takes over the group). The rights under 5.1 continue to that extent after your account ends. Groups without other members are deleted with all their content. On request by email we will remove individual items afterwards as well.

6. Community rules (zero tolerance)

Offensive content and abuse are not tolerated. In particular, the following are prohibited:

  • illegal content, including copyright infringement
  • insults, harassment, threats, hate speech and discrimination
  • sexual content or content glorifying violence
  • spam, advertising and malware
  • other people's personal data without their consent
  • impersonation, leaderboard manipulation, circumventing bans or limits, automated mass requests

Only record with teckst where your lecturer or university allows it; recording privately spoken words without permission is a criminal offence in Germany (§ 201 StGB). Recordings are for your own studying only; in groups you share notes and slides, never audio.

If the rules are broken we may hide or delete content, restrict uploads and suspend accounts temporarily or permanently. We decide case by case, diligently and proportionately, taking into account the severity of the violation and the rights and interests of everyone involved. A suspended account can still be deleted.

7. Reporting content

You can report decks, lectures, groups and people directly in the app (Report, with a reason and an optional note) and block people. We also accept reports, including from people without an account, by email to [email protected]. Please state: what you are reporting (link or name of the deck, lecture or group), why the content is illegal or breaks the rules, your name and email address (except for certain offences against children), and that your report is made in good faith.

We usually review reports within 24 hours. Content reported by three different people is hidden automatically until it has been reviewed; a human decides on deletion or suspension. When we remove content or suspend an account, we tell the person concerned and give reasons (the measure, the reason, the rule or law concerned, whether it was hidden automatically, and how to object), as far as we can reach them. You can object to a decision by email and we will review it again. Your right to go to court is unaffected. Anyone who frequently uploads manifestly illegal content or frequently submits manifestly unfounded reports will first be warned and may then be suspended or excluded from reporting for a reasonable period.

Point of contact for authorities and users under the Digital Services Act: [email protected], languages German and English.

8. Availability

The core features run on your device. We provide online features (sync, groups, leaderboards, sharing) with reasonable care but cannot promise uninterrupted availability, for example during maintenance or outages at service providers. Keep a backup of important data (for example a .colpkg export).

9. Liability

  • We are liable without limitation for intent and gross negligence, for injury to life, body or health, under the German Product Liability Act and where we have given a guarantee.
  • For slight negligence we are liable only for breach of essential contractual obligations (obligations whose fulfilment makes performance of the contract possible in the first place and on which you may regularly rely), limited to the foreseeable damage typical for this kind of contract.
  • Otherwise liability is excluded. For the free features, the statutory privileges for gratuitous services also apply.
  • Other users are responsible for their own content; OpenAI's output when you use your own key is governed by your contract with OpenAI.

10. External services

Which service providers we use (Hetzner, Cloudflare, Brevo, Apple, OVH for access statistics) and when data goes to OpenAI or GitHub is set out in the Privacy Policy.

11. Changes

We may change these terms when the apps, the law or our service providers' services change. We will inform you about material changes in the app or by email with reasonable notice. Changes to the price or scope of a running subscription apply only in accordance with Apple's rules.

12. Final provisions

German law applies, excluding the UN Convention on Contracts for the International Sale of Goods. If you are a consumer, the mandatory consumer protection rules of the country where you habitually reside remain unaffected. Jurisdiction at the provider's place of business applies only to merchants, legal entities under public law and special funds under public law.

If individual provisions are invalid, the remaining provisions remain valid.

We are neither obliged nor willing to take part in dispute resolution proceedings before a consumer arbitration board.

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