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EarChord

EarChord

Get the chords out of an audio file, in your browser

hello946hello946·Published on Oct 26, 2026·0 reputationReputation invested into this product to boost its ranking. Anyone can spend the reputation they've earned here — recent investments count for more and lift the product higher on the leaderboard. This is separate from community upvotes.
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Categories
Video & Audio ToolsDeveloper Tools
Use cases
Video EditingAudio EditingInstrument Learning
Target audience
Audio EngineersArtistMusiciansLanguage Learners
Pricing model
Free
Platforms
Web

▤ Screenshots

About EarChord

EarChord is a chord finder for audio files that runs entirely inside the browser. Drop in a track you already have and it returns the chord progression along the timeline, the key of the song and the tempo in BPM. There is no account, no daily limit and no upload step: the browser decodes the file and the analysis runs on your own processor inside a Web Worker.

That is also why it can be free and unlimited. Most chord-finding sites fetch and analyse audio on their own servers, which costs bandwidth and compute per song, and daily limits follow from that arithmetic. Running the analysis on the visitor's machine removes it, and the privacy property people notice first - that recordings never leave the machine - is a consequence of the same decision.

The analysis is classical signal processing in about three hundred lines of TypeScript, with no machine learning and no third-party audio library: the audio becomes a chromagram, each frame is matched against twenty-four major and minor triad templates, the key comes from the Krumhansl-Schmuckler profiles and the tempo from the onset envelope. The chord vocabulary is twenty-four major and minor triads, so sevenths, suspensions and inversions are reported as the nearest triad - stated openly on the site.

A Chrome extension shows the chords under a YouTube video as it plays, reading audio the player is already producing through the Web Audio API.

✦ Good to know

  • Analyses uploaded MP3, WAV, M4A and AIFF files directly in the browser, with audio never uploaded.
  • Free and unlimited with no signup, unlike Chordify's two songs a day limit.
  • Outputs a timeline of chords with timestamps, a key with confidence, and BPM.
  • Chords are limited to major and minor triads, so sevenths and sus chords are not detected.
  • Distorted guitar and power chords can be misread, since they lack a clear major or minor third.

Taken from the product's own website and re-checked automatically.

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