e Ed Caspersen
Centimental app icon

iPhone · iPad · Apple Watch

Centimental

A chromatic tuner for guitar, bass, and ukulele

Real-time pitch detection with 40+ hand-designed visual themes, custom tunings, capo support, and a free Apple Watch app. One-time Pro unlock, no subscription.

Download on the App Store User Guide Contact support

Welcome

This is the home for everything around Centimental: a chromatic tuner for guitar, bass, and ukulele with 40+ visual themes, custom tunings, capo support, and an Apple Watch app.

  • User Guide: a full walkthrough: getting started, gestures, string indicators, themes, Apple Watch, and Pro features.
  • Troubleshooting: quick answers to the most common questions.
  • Changelog: what’s new in each release.
  • Privacy Policy: no data collection, no tracking, audio processed on-device.

Support

Found a bug, have a question, or want to suggest a feature? Email nospam@edcaspersen.com. I read every message. Including your device model, iOS version, and the app version (Settings → About → Version) makes reports much easier to act on.

  • Privacy Policy: Centimental collects nothing. Audio is processed entirely on your device and never recorded or transmitted.
  • Terms of use: Centimental is licensed under Apple’s Standard End User License Agreement, which applies to every app downloaded from the App Store unless the developer provides custom terms.

About

Centimental is an independent app by Ed Caspersen. The tuner engine is built on AudioKit with a custom YIN-based pitch-detection pipeline tuned for guitar and bass. It listens through the built-in microphone or a connected USB-C audio interface, including multi-channel interfaces where you can pick which input channel your instrument is on. Themes are hand-designed SwiftUI views.