Last updated: October 2026 · Version 1.1. This is a translation for convenience; the legally binding version is the German AGB.
1. Scope, provider
(1) These terms and conditions govern use of the mobile application “VokaKitty” for Android and the web app “VokaKitty” that runs in the browser (both hereinafter the “app”), the associated server services and the website vokakitty.nl (together, the “service”).
(2) The provider and contracting party is Christian Staehler, Wendelsweg 60, 60599 Frankfurt am Main, Germany (the “provider”). Contact: info@vokakitty.nl. Further details in the legal notice.
(3) These terms apply exclusively. Any conflicting terms of the user are hereby rejected.
2. Subject matter, description of services
(1) The provider supplies a vocabulary trainer. Scope of features: creating and maintaining word lists (“pools”), learning by the Leitner system in various modes, AI-assisted features (including cloze texts, translation suggestions and the import of word lists from text and photos), sharing pools with friends, an online challenge (real-time match), notifications and game elements (streak, coins). A chat or messaging function is not part of the service.
(2) Use of the service is currently free of charge. There is no entitlement to permanent free provision. Paid features will be identified separately before any order.
(3) Further development: the service is continuously being developed; pre-release versions in the beta programme are expressly test versions. Features may change, be temporarily unavailable or be discontinued. Despite all care, data loss cannot be entirely ruled out; the user shares responsibility for making reasonable backups of their own, to the extent the app allows this.
(4) External providers are used for the AI-assisted features. No warranty is given for the accuracy, completeness or appropriateness of automatically generated content – such as sentences, translations or words imported from photos; the user should check it before learning.
(5) Web app: the web app requires a current browser in which JavaScript and the storing of website data are permitted. Its range of features largely corresponds to that of the Android app; differences arise from the capabilities of the browser – in particular there are no push notifications (reminders only while the web app is open) and no sign-in with Apple. The web app stores learning data in the user’s browser; if the user deletes the website data, changes not yet synchronised are lost. On shared devices the user must sign out after use.
3. Registration, account, minimum age
(1) Use requires an account. The information provided at registration must be accurate and complete.
(2) The service can be used from age 4. The social and online features – the friends function, sharing pools and the online challenge – are available to persons under 16 only after consent from a parent or guardian; until then they remain blocked. The provider may request proof of age or of consent and may block or delete accounts where the requirements are not met.
(3) Access credentials must be kept secret. The user is responsible for activity under their account unless they are not responsible for the misuse. Any suspicion of misuse must be reported to the provider without delay.
(4) Registration forms a free contract of use for the service on these terms.
4. Rights of use
(1) For the term of the contract, the provider grants the user a simple, non-transferable, non-sublicensable right to use the app as intended on devices under their control or in browsers installed on them.
(2) The following are prohibited in particular: reverse engineering, decompiling or disassembling the app beyond the limits mandated by law; circumventing security or access mechanisms; automated access (bots, scrapers) outside the interfaces provided; and any use that impairs the availability or integrity of the service.
5. User-generated content, rules of conduct
(1) The user remains responsible for the content they add (pools, words, username). They warrant that this content does not infringe third-party rights and does not violate applicable law.
(2) Unlawful, insulting, harassing, youth-endangering or discriminatory content is prohibited, as is sharing other people’s contact details, spam and links to unlawful offerings – including within pool and vocabulary texts and in the username.
(3) The user grants the provider the simple right, unlimited in territory and for the term of the contract, to store the content added, reproduce it technically and make it accessible to the other users entitled to it (for example recipients of a share, or match partners), to the extent necessary to provide the service.
(4) In the event of breaches of section 5, the provider may remove the content concerned, restrict individual features and block the account temporarily or permanently. The right to terminate for cause remains unaffected.
6. Availability
The provider endeavours to keep the service usable as continuously as possible but does not owe any particular level of availability. Maintenance windows, faults at upstream suppliers (hosting, push service, AI provider) and cases of force majeure may restrict use. The app’s core features are usable offline; for this the web app must first have been loaded online once.
7. Term and termination
(1) The contract runs for an indefinite period. The user may end it at any time without notice by deleting their account in the app.
(2) As the service is provided free of charge, the provider may terminate the contract at any time without notice in text form (email is sufficient). The right to terminate for cause remains unaffected; cause exists in particular in the event of serious or repeated breaches of sections 4 or 5. The user may export their content before the termination takes effect, to the extent the app provides for this.
(3) When the termination takes effect, identifying account data is deleted and the content anonymised in accordance with the privacy policy.
8. Liability
(1) The provider is liable without limitation in cases of intent and gross negligence, for damage arising from injury to life, body or health, under the German Product Liability Act, and to the extent of any guarantee given.
(2) In cases of simple negligence the provider is liable only for breach of a material contractual obligation (cardinal obligation), and limited to the foreseeable damage typical of the contract.
(3) Liability is otherwise excluded. For services provided free of charge, the provider is liable only by the standards of sections 521, 599 of the German Civil Code (intent and gross negligence), to the extent permitted by law.
(4) The provider accepts no liability for the content of other users or for the results of the AI-assisted features. Liability for data loss is limited to the damage that would have occurred even with proper and regular data backups.
9. Changes to these terms
(1) The provider may amend these terms with effect for the future where this is necessary to adapt to changes in the law, in case law or in features, and where the user is not unreasonably disadvantaged as a result.
(2) The amended version will be announced in text form or in the app before it takes effect; where the change requires active consent, it will be presented for confirmation the next time the app starts. If the user does not agree, they may end the contract at any time by deleting their account. Continued use of the service after the change takes effect is deemed to be consent; this will be pointed out separately in the announcement.
10. Means of obtaining the app
Obtaining the Android app via Google Play is additionally subject to Google’s terms. The web app is provided directly by the provider; no app store is involved, even if the user adds it to the home screen on an iPhone or iPad. This contract exists exclusively between the user and the provider; Google and Apple are not parties to it and are not responsible for the app. Support is provided by the provider.
11. Dispute resolution
The provider is neither obliged nor willing to take part in dispute resolution proceedings before a consumer arbitration board.
12. Final provisions
(1) The law of the Federal Republic of Germany applies, excluding the UN Convention on Contracts for the International Sale of Goods. Mandatory consumer protection provisions of the state in which the user has their habitual residence remain unaffected.
(2) If the user is a merchant, a legal entity under public law or a special fund under public law, the place of jurisdiction is Frankfurt am Main.
(3) Should any provision of these terms be or become invalid, the validity of the remaining provisions remains unaffected.