About this app
Retro Tuner is a musical instrument tuner for the iPhone, iPad, and iPod Touch. It features a user interface in the style of an analog panel meter and Nixie tube note display, but below this retro surface are all-new digital signal processing algorithms that determine the pitch of your instrument quickly and accurately. Retro Tuner was written by the owner of several crappy guitars and a 1920s player piano that is constantly going out of tune, with the idea that if it can tune those, it can tune anything. Retro Tuner tunes in equal temperament and can handle the full 88-key piano range. The reference pitch defaults to A=440 Hz and can be adjusted via Settings either as a frequency in Hz or as a detune factor in cents.
Latest release
What’s New
Fixed a bug that could cause a failure to resume operation after an audio interruption such as an alarm or incoming call.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Sep 4, 2026 · 4:26 AM $2.99
Screenshots
