CordOS Free on iPhone
The operating system for guitarists.

Write songs. Tune up.
Dial in your gear.

CordOS puts a songwriter, your everyday guitar tools and your gear's real knobs in one app. Everything guitar, on your iPhone.

Soon on theApp Store

Android is coming later.

FreeNo adsNo trackingNo AILight & dark
Songwriter‹
Morning Light
KeyG
Tempo92
Time4/4
LoopON
Verse GCoffee's getting Emcold again CWindow full of Drain Chorus CSing it Gout, Dsing it Emloud
IdeasPlay
Progression
GEmCD
Tuner‹
Chromatic
-50 ¢Zero notch+50 ¢
E2FREQ 82.41 Hz✓ +0.3 ¢ IN TUNE
Standard · E A D G B E
Reference
A4440.0 HzStandard
Metronome‹
Tempo
BPM120
−Tap tempo+
Settings
4/4Quarter
1234
Stop
Chords‹
Choose a chord
CMajorOpen
C major
Previous shapeNext shape
Formula1 - 3 - 5
NotesC - E - G
Scales‹
Choose a scale
AMinor pentatonic
Fretboard
1 b3 4 5 b7Frets 5–8
Jam‹
Groove
Blues — Texas Shuffle›
Player
Texas Shuffle122 BPM · E
Now playing
A7
Next
E7
Bar 30 / 144
❚❚■
Tone‹
Current gear
Rig 1 of 10
My Strat rigClean with chorus
ChainSquier Strat › ID:Core 20
Guitar›Pedals›Amp
Amp · Blackstar ID:Core 20
Voice
Clean BClean WCrunch
Gain
20%
ISF
35%
Chorus
30%
Saved in My TonesSave tone
ToolsToneSettings
GEmCD
Songwriter
Chords over your lyrics, ideas for the next chord.
Tuner
Fast, clear, with alternate tunings.
Metronome
Steady and simple.
Jam
Backing tracks with real guitar and keys.
Chords
Real guitar sound. Save your favorites.
Scales
Every scale, position by position.
IiiIVV
Keys
All the chords in any key.
?Am7
Finder
Name a chord, a key or a scale.
GTR›FX›AMP
Tone
Your rig, with its real knobs.
No ads. No tracking. No AI. Your songs and tones are backed up to your account. Delete it any time from Settings.

Questions

Is CordOS free?

Yes. CordOS is free to download and use.

Do I need an account?

No. The tools work without one. Make a free account to back up your songs, saved chords, rigs and tones.

Is it on Android?

Not yet. CordOS starts on iPhone. Android is planned.

Does Tone change how my guitar sounds?

No. CordOS doesn't process your sound. It shows your gear's real knobs so you can set a sound, save it and find it again.

Is my gear in there?

There are more than 2,500 electric guitars, amps, pedals and multi-effects, and more are coming. Missing something? Email support@cordos.app.

Does CordOS use AI?

No.

Does the tuner record me?

No. The tuner listens only while it's open. Sound stays on your iPhone and is never recorded or uploaded.

Who made the backing tracks?

They were recorded for CordOS with real guitar and keys, with bass and drums played by hand.

How do I delete my data?

In the app, go to Settings, then Account, then Delete account. Your account and everything saved in it are removed.

Can I get CordOS in my country?

CordOS is in most countries at launch. It isn't in EU countries yet.