Terms of Use (AGB)

These terms of use apply to the use of Kontera, an offering of Sole Propietorship, Spink Systems ("we", "Kontera"). By creating an account or using the offline function, you accept these terms.

An account is intended for a single natural person. You are obliged to provide truthful information and to keep your password secret. Kontera is aimed at learners from around age 15; no automated age verification takes place (see Privacy Policy, Section 4).

You can also use Kontera offline, without an account — in that case your progress remains stored locally in your browser (see Privacy Policy, Section 2) and no contractual relationship regarding an account is established.

Kontera is currently free to use. [[PREISMODELL]] — should we introduce paid features in the future, we will inform you in advance and you decide voluntarily whether to use them.

For individual AI features you may purchase credit in advance (prepaid AI credit). This credit bears no interest and may be used only for the AI features.

Unused, purchased credit may be paid back out to you on request. Only purchased credit is withdrawable; bonus or promotional credit (promo) is excluded from withdrawal. The minimum withdrawal is CHF 10. Payout is made either as a refund to your original payment method or — after review by us — by bank transfer to an IBAN you provide, or by TWINT to your Swiss mobile number. How we process the payment and payout data required for this is described in the Privacy Policy.

Withdrawals are made only on active request from an existing account. If you delete your account without first requesting a withdrawal, any unwithdrawn credit is forfeited upon account deletion and is not refunded. No automatic payout takes place on account deletion.

Teachers can create a class and invite learners via a join code. Joining is voluntary. As described in the Privacy Policy (Section 3), after joining, the managing teacher currently sees the complete learning statistics of the joined account — there is not yet a granular selection of which data is shared.

Leaving a class independently is currently not available as a feature within the application. If you wish to end a class membership, contact us at samuel@spink.dev.

Teachers undertake to use the data visible via the class feature exclusively for pedagogical purposes within the scope of instruction.

You undertake not to use Kontera for automated mass access, circumventing security mechanisms, or harassing other users (e.g. via freely chosen names). We reserve the right to block accounts in the event of misuse.

The exercise content, texts, illustrations, and the Kontera brand belong to us or our licensors. You are granted a simple, non-transferable right to view and work with the content within the scope of its intended use.

Your learning data (progress, answers, statistics) remains your own data — you may request access to it or its release at any time (see Privacy Policy, Section 8).

XP, levels, streaks, and badges are playful progress indicators with no monetary value. They may shift or be reset as a result of product changes (e.g. technical adjustments) and do not create any entitlement.

We strive for reliable operation but do not guarantee any particular availability, unless separately agreed in writing with a school ([[SCHUL_SLA_STATUS]]). Maintenance work and interruptions are possible.

We are liable within the scope permitted by law. Mandatory liability provisions of Swiss law (in particular for gross negligence or intent) cannot be excluded and remain unaffected.

The values shown in Kontera (e.g. VAT/MWST rates, AHV/BVG rates) are educational reference values maintained for a specific year and do not constitute tax or legal advice.

You may stop using the service at any time. A self-service account deletion function is available in your profile (72-hour grace period, then permanent deletion); you can also reach us at samuel@spink.dev.

Note: any unwithdrawn AI credit is forfeited upon account deletion and is not refunded (see Section 3). Request a withdrawal before deleting your account.

We may block or delete an account in the event of a serious breach of these terms.

We may adapt these terms. The current version, together with the date, is always shown at the top of this page. In the event of material changes, we will additionally inform you within the product.

Swiss law applies, excluding the UN Convention on Contracts for the International Sale of Goods (CISG). To the extent permitted by law, the place of jurisdiction is Switzerland.

The German version of these terms of use is authoritative; the French and English versions are non-binding translations.