AI Chord Analyzer

How accurate is AI chord analysis?

Updated: Nov 3, 2026

Drop a song here, or click to choose

An audio or video file. A full band recording gives truer chords than a vocals-only file. Drop a data file (.json) you saved earlier to reopen it.

Processing method

moiMoisesListens to the whole track and detects the chord on every beat with Moises AI, with the key and the tempo.

No chord sheet exists, and the machine keeps guessing wrong?

Detection works on pop and ballads with an open arrangement. Jazz harmony, a mid-song modulation or a dense production is where it misreads constantly. Our team transcribes chords by ear for tracks like those.

The chord analyzer listens to the song in your audio or video file and returns a chord chart in bars, one cell per beat, with the key and the tempo. Send the whole chart to your band with one link: anyone who opens it sees the chords run along with the click, with no account and no Energy spent; the chart shows first and the song audio follows. Play the song on the page to watch the chords move with the music, switch the chord style, transpose, then copy or download the chart.

How do I send the chords to my band?

Press Share on the chart you just analyzed to get a private link, then drop it in the band chat. Anyone who opens it sees the chart with the click running along, can transpose or switch the chord style to suit their voice, with no account and no Energy spent.

The chart shows first and the song audio follows. The chart stays in the link until you revoke it, while the audio plays for as long as our server keeps the file.
To send it without a link, send the .json file you downloaded: dropped on the page, it opens the chart and runs the click, even when the other person has no copy of the song.
The link is not listed on Google, so only people who hold it can look, and you can revoke it at any time.

How does the chord analyzer work?

The AI listens to the whole track, finds its beats and bars, then pins the sounding chord to every beat. It also estimates the key and the tempo. The chart reads the way players write chords down: the chord name on the beat it starts, a slash on beats that keep the same chord, one box per bar.

How do the three chord styles differ?

Basic always writes a three-note chord, major or minor, the easiest to play for a beginner. Standard and Full keep the same beats as Basic but may add extended notes depending on the song, plus the bass note when it differs from the root, such as C/E. Switching style costs no extra run, the whole chart changes on the page.

Does transposing change how chords are spelled?

Yes. When you move up or down a semitone at a time, every chord is respelled for the new key: in E flat minor the chart reads Eb and Bb, not D# and A#. That makes it read like a player's handwritten chart. To keep the shapes of the original key instead, use a capo to compensate.

How accurate is automatic chord analysis?

Fine for major and minor chords in a clear arrangement. Extended chords and jazz harmony tend to get read as the nearest simpler chord. The more layered the mix, the more passages of drums or voice alone, or a mid-song modulation, the higher the error rate. Treat the chart as a draft to check by ear and correct at the instrument.

Should I separate the vocal before analyzing chords?

Usually not: chord detection reads the backing instruments, and a full band recording gives the best result. Only when a thick, heavily processed vocal buries the accompaniment is it worth trying to split the vocal from the instrumental and running the instrumental for comparison.

How does this compare to working it out by ear or looking up a chord sheet?

The three approaches complement each other. A published chord sheet is handy, but only popular songs have one and many are user-submitted and wrong. Working it out by ear is the most trustworthy and trains your hearing, at the cost of time. Machine detection is the fastest and works on any file, including your own recordings. The sensible use is to let the machine map out the harmony, then verify the changes that matter at the instrument.

How is the price worked out?

By the length of the track: 4 Energy per minute of audio, tracks up to 20 minutes. The amount for your track shows on the run button as soon as you pick the file, before you press it. The tool needs you to sign in and has no free runs. A failed run gets its Energy back.

Who needs automatic chord analysis?

Bands and live players who need to get the chords to everyone before a show: one link and each person sees the chart and hears the click
Producers and session musicians sending the harmony outline to an arranger, a singer or a session player
Self-taught guitar or piano players who want to accompany a favourite song
Musicians who need a quick chord reference for a song with no sheet available
Music teachers preparing practice material for students
Cover artists who need the original progression before rearranging it
Anyone double-checking chords they picked out by ear

The steps below are the tool's real flow.

Upload the song
Pick or drop an audio or video file. The tool reads its length and shows the Energy amount on the run button.
Press Analyze chords
The file goes up to our server, where the AI finds the beats and bars of the song and pins a chord to every beat, with the key and the tempo.
Play along with the chart
Press play and the sounding beat lights up as the song goes, with the current and next chord shown right above the waveform. Click a cell to jump to that beat. Switch on the metronome to hear a click along with the song.
Pick a chord style and a key
Switch between Basic, Standard and Full to suit your level. Transpose up or down a semitone at a time when the original key is awkward to play.
Send the link to your band
Press Share to get a private link and drop it in the band chat. Anyone who opens it sees the chart and hears the click run along, with no account. You can revoke the link at any time. To send it without a link, send the .json file: dropped on the page, it reopens the chart.
Copy or download
Press Copy chords to paste them elsewhere, or download a .txt file in the chord style and key you picked. The metronome (.wav) and the data (.json) download too. Dropping the .json on the page later reopens the chart at no Energy cost.

The output is a machine estimate, not an authoritative transcription. Dense harmony and passing notes make neighbouring chords easy to confuse.
Songs that modulate mid-way are where errors cluster. Always check by ear.

Input and output

Input: An audio or video file: MP3, WAV, FLAC, M4A, MP4 and other common formats. A full band recording gives better results than a vocals-only file
Output: A chord chart in bars, one cell per beat, with the key and the tempo (BPM). Copy it on the page, or download a .txt file, the metronome as .wav and the data as .json The output is a machine estimate, not an authoritative transcription
Chord style: Three styles: Basic, Standard and Full. Transpose the whole chart, with every chord respelled for the new key

Sharing with your band

Share link: Press Share on the chart to get a private link. Anyone with it sees the chart and hears the click run along, can transpose and switch the chord style, with no account and no Energy spent. The chart shows first, the song audio follows The chart stays in the link until you revoke it. The song audio plays for as long as our server keeps the file
Send the .json: Send the .json file you downloaded. Dropped on the page, it opens the chart and runs the click, even when the other person has no copy of the song
Control: The link is not listed on Google. Revoke it any time and it stops opening at once

Processing

Where it runs: On our server, with Moises AI chord analysis. Not in the browser
Play along: Play the song on the page and the sounding beat lights up as it goes, with the current and next chord shown right above the waveform. Click a cell to jump to that beat
Metronome: Switch on a click on every beat of the song, with the first beat of each bar higher and louder. Download it as a .wav file
Reopen a result: Drop a saved .json file on the page, or open it from Activity history. Reopening costs no Energy
Accurate on: Major and minor chords in a clear arrangement: pop, ballads, acoustic material
Unreliable on: Jazz harmony, dense layered production, songs that modulate mid-way and passages of drums or voice alone

Limits

Longest track: 20 minutes per track

Price and account

Price: 4 Energy per minute of audio The amount for your track shows on the run button before you press it
Account: Sign-in required to analyze. This tool has no free runs Anyone you send a share link to needs no account
On failure: A failed run gets its Energy back

Processing method

Description: Listens to the whole track and detects the chord on every beat with Moises AI, with the key and the tempo.
Runtime: On our server
Paid: 4E per minute · Up to 20 min/file

Nov 3, 2026
Metronome, chords above the waveform, reopen a result
The current and next chord now show right above the waveform. A switch turns on a click on every beat, downloadable as a .wav file, next to a button for the .json data. Drop the .json on the page, or press Open chord chart in Activity history, to see a chart again at no Energy cost. The progress bar now says whether it is uploading, sending or fetching the result, and says so plainly when it takes longer than expected.
Nov 1, 2026
New name: Chord Analyzer
The tool is renamed from Chord Detector to Chord Analyzer, after what it does: listen to a song and write the chord on every beat. Features, price and URL are unchanged.
Oct 31, 2026
Tool is live: a chord on every beat, transposing, play along
Upload a song and get a chord chart in bars, detected by Moises AI, with the key and the tempo. Pick one of three chord styles, transpose, play the song on the page with the sounding beat lit up, then copy the chart or download a .txt file. 4 Energy per minute, tracks up to 20 minutes, sign-in required.
Aug 24, 2026
Plainer wording in the specifications table
The limits row in the Specifications tab now reads as a plain maximum instead of a finance-flavoured word. The figures and their meaning are unchanged.
Jul 26, 2026
Specifications tab added
The page gained a Specifications tab, lifting the three stages of detection and where it is accurate or unreliable out of the article. The ceiling and price rows say plainly that nothing is published yet, because the tool is not open and no figure is real. The transcription offer moved above the tab strip.
Jul 25, 2026
Rebuilt on the shared tool frame
The page moved onto the frame shared by every tool page and gained an Instruction tab describing the planned steps. The Intro tab gained a definition section and a comparison between machine detection, working it out by ear and published chord sheets. The tool itself is still not open.
Jul 22, 2026
URL shortened to /chord-analyzer/
The former /tim-hop-am/, /chord-finder/ and /en/chord-detector/ paths 301'd to the new address.
Jul 19, 2026
Page published with full content
The page got real written content about chord detection and was opened to search indexing, replacing an empty coming-soon placeholder.

AI Chord Analyzer

How accurate is AI chord analysis?

No chord sheet exists, and the machine keeps guessing wrong?

How do I send the chords to my band?

How does the chord analyzer work?

How do the three chord styles differ?

Does transposing change how chords are spelled?

How accurate is automatic chord analysis?

Should I separate the vocal before analyzing chords?

How does this compare to working it out by ear or looking up a chord sheet?

How is the price worked out?

Who needs automatic chord analysis?

Upload the song

Press Analyze chords

Play along with the chart

Pick a chord style and a key

Send the link to your band

Copy or download

Input and output

Sharing with your band

Processing

Limits

Price and account

Processing method

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