Your Free Professional
Instrument Tuner
Real-time pitch detection for Guitar, Bass & Ukulele — right in your browser. No download. No account. Always free.
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Built for serious players
Real-Time Pitch Detection
Web Audio API autocorrelation analyzes your microphone input instantly. The needle responds in real time — no lag, no guessing.
KCM Chromatic Color System
C=Yellow, F#=Blue, A=Cobalt — every note carries its signature color from our visual theory framework, reinforcing what you hear with what you see.
Reference Tone Playback
Tap any string to hear its target pitch with harmonic synthesis. Perfect for tuning by ear or confirming your pitch before playing.
25+ Tuning Presets
Standard, Drop D, Open G, DADGAD, Open D/E/A for guitar. Standard 4/5/6-string and drop tunings for bass. Multiple ukulele voicings.
Mobile-First Design
Prop up your phone on a music stand and tune hands-free. Fully responsive — crisp and readable at any screen size.
Private by Design
All audio processing happens locally in your browser. Nothing is recorded, transmitted, or stored. Your microphone data never leaves your device.
Always Free. No Strings Attached.
The KCM Tuner is our gift to every musician. Use it forever, share it freely — it's the door into the Keys, Codes & Modes universe.
Get Instant Access →Zero cost. Zero compromise.
- Guitar tuner — standard & 8 alternate tunings
- Bass tuner — 4, 5 & 6 string + drop tunings
- Ukulele tuner — soprano, tenor, baritone
- Chromatic mode — detect any of the 12 pitches
- Visual needle meter — flat / in-tune / sharp
- KCM color-coded notes — 12-color chromatic system
- Reference tone playback — hear target pitch
- Play All Strings sequencer
- Works offline — no internet needed once loaded
- No login required — open and play immediately
- No ads — clean, distraction-free experience
- Audio stays local — mic data never transmitted
The Tuner Is Just the Beginning
Keys, Codes & Modes is a complete visual music theory platform. Sign up free and pick 3 apps, or unlock everything with a Student or Professional membership.
See All Plans & Pricing
Free forever · Student from $15/mo · Founder's Circle $697 lifetime
Frequently Asked Questions
Is the KCM instrument tuner really free?
Yes. The KCM Tuner is completely free, forever. No account, no download, and no credit card required.
Does the tuner work on mobile?
Yes. The KCM Tuner is fully responsive and works on phones, tablets, and desktop browsers. Just allow microphone access when prompted.
Is my microphone audio stored or transmitted?
No. All audio processing happens locally in your browser using the Web Audio API. Your microphone data never leaves your device and is never recorded or stored.
What instruments does the tuner support?
Guitar (standard and 8+ alternate tunings including Drop D, Open G, DADGAD), Bass (4, 5, 6-string and drop tunings), Ukulele (soprano, tenor, baritone), and a fully chromatic mode for any instrument.