Harmonic.Audio

HARMONIC AUDIO TUNER

Pluck a string.

A focused guitar tuner that does one job and nothing more, so you can spend your time jamming. Built to be trusted, not to keep you in the app.

  • FREE — NO ADS, NO UPSELLS
  • NO ACCOUNTS, NO ANALYTICS
  • WORKS COMPLETELY OFFLINE
  • AUDIO STAYS ON YOUR DEVICE
  • STANDARD, DROP, OPEN & CUSTOM TUNINGS
Download on the App StoreGet it on Google Play
TUNINGSSTANDARDE A D G B EDROP DD A D G B EHALF-STEPE♭ A♭ D♭ G♭ B♭ E♭OPEN GD G D G B DDADGADD A D G A DCUSTOMANY STRING, ±7 ST

MEASURED, NOT CLAIMED

Every figure here is computed when this site is built, from the benchmark the Tuner commits with each change to its pitch estimator.

Synthetic fixtures
87
Median time to first reading
35 ms
Median steady-tone error
0.01 cents
Highest steady-tone inlier P95 error
0.15 cents
False positives
0
Dataset
synthetic-guitar-development-v1

These are synthetic-development results: generated guitar tones run through the Tuner's pitch estimator, not recordings of instruments. Real-guitar accuracy has not been measured, so none of these numbers is a claim about every instrument, room, or device.

WHAT THE STORE LISTINGS SAY

Harmonic Audio Tuner beside GuitarTuna and Fender Tune, as each official store listing described itself when it was read. The Harmonic column is this app's own privacy policy and the benchmark above.

ComparedHarmonic Audio TunerGuitarTunaFender Tune
Store price and purchasesFree, with no in-app purchases.
  • Free, with in-app purchases: subscriptions listed from $6.49 to $139.99 in the US store. The listing says prices vary by country.Apple App Store, US, reviewed
  • Free to install, labelled with in-app purchases; prices not shown.Google Play, US, reviewed
Google Play advertising labelNo ads. Its public Google Play listing is not live yet.
Tuning access the listing describesStandard, drop, open, and custom tunings, free with no account.
  • Describes a free guitar tuner and a subscription for unlimited access; which tunings each includes is not stated.Apple App Store, US, reviewed
  • Says the standard guitar tuner is free to use and lists 100+ tunings including custom; which need a purchase is not stated.Google Play, US, reviewed
  • Lists 26 tunings; custom tunings are saved to a Fender Connect profile, and a free Fender account unlocks more resources.Apple App Store, US, reviewed
  • Lists 26+ tuning presets and custom tuning profiles among tools it describes as included free.Google Play, US, reviewed
Google Play data-sharing disclosureIts privacy policy says no data is collected or shared. Its public Google Play listing is not live yet.
  • The developer discloses that the app may share personal info, financial info, and 3 other data types with third parties.Google Play, US, reviewed
  • The developer discloses no data shared with third parties; the app may collect location, personal info, and 3 other data types.Google Play, US, reviewed
Published numerical accuracy0.01 cents median steady-tone error on synthetic fixtures; real-guitar accuracy not yet measured.

Store disclosures are statements by each developer, not independently verified facts. Prices and listings can differ by country and change over time. A listing that does not state something is shown as not shown.