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KeyFu
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The app

  • Today’s practiceStart to finish
  • RoutinesReady-made free, build your own with Pro
  • Play freelyNothing to get wrong
  • LibraryEvery exercise, in other keys too
  • Ear trainingHear it, play it back
  • CoachPlans what’s next, and says why
  • How it adaptsReads what your hands did

For you

  • ProducersPlay chords instead of drawing them in
  • SongwritersThe chords you know, under your hands
  • PlayersPlay by chords, without sheet music

Legal Notice

Information pursuant to § 5 DDG and § 18(2) MStV (Germany)

Last updated 1 October 2026

Provider

Martin Neuschulz
Kurt-Eisner-Straße 58
04275 Leipzig
Germany

Legal form: sole proprietor (Einzelunternehmen)

Contact

Phone: +49 341 24904204
Email: hi@keyfu.app

VAT

Small business under § 19 UStG: we do not charge VAT. A VAT ID has been applied for. It and our business ID (W-IdNr.) will be listed here once issued.

In-app purchases are sold by Apple, which charges VAT on them where it applies.

Responsible for content under § 18(2) MStV

Martin Neuschulz, address as above.

App Store trader information

For KeyFu in the App Store, the trader details required by the EU Digital Services Act are provided through App Store Connect and shown on the app’s product page in the EU App Store.

Consumer dispute resolution

We are not obliged and not willing to take part in dispute resolution proceedings before a consumer conciliation body (Verbraucherschlichtungsstelle, § 36 of the German Consumer Dispute Resolution Act, VSBG).

Content and links

We are responsible for our own content on this site and in the app. This site links to other sites, whose operators are responsible for their content. If we learn that a linked page breaks the law, we remove the link.

Copyright

The content and works created for this site and the app are subject to German copyright law. Third-party brand and product names (including Apple, Cloudflare, Anthropic, Google and OpenAI) belong to their owners. This site uses the typefaces Instrument Sans, IBM Plex Mono and Newsreader under the SIL Open Font License 1.1, and open-source software under the MIT License. The notices and license texts are in licenses.txt. The app lists its own under Settings → Support & legal → Type, sound & licenses.

Back to KeyFu

The app

  • Today’s practice
  • Routines
  • Play freely
  • Library
  • Ear training
  • Coach
  • How it adapts

Who it's for

  • For producers
  • For songwriters
  • For players

Legal

  • Legal Notice
  • Privacy
  • Terms

Support

  • Support & FAQ
  • App manual
  • Press
  • hi@keyfu.app

© 2026 KeyFu

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