Guitar, bass, violin, viola, cello, ukulele, and mandolin presets with standard tunings ready to go.
Free online tuner
A free online tuner that respects your ears
Fiume is a browser tuner for guitar, bass, violin, viola, cello, ukulele, and mandolin. Pick your instrument, play a string, and get precise real-time feedback with cent-level accuracy. No install, no account, no audio sent to a server.
Free. In-browser. Microphone permission only when you press start.
Real-time pitch detection built on a pitch engine, not a toy frequency picker. See how close each string really is to target.
Audio is analyzed locally in the browser. Fiume never uploads or records your playing unless you explicitly choose to.
One click, one microphone permission, and the tuner is listening. No signup wall, no paywall for the core experience.
Why Fiume over a basic tuner
A free tuner with serious DSP under the hood
Most free online tuners are lightweight scripts that lose track of the note the moment the sustain fades. Fiume runs the same real-time engine that powers the pitch monitor — it stays locked on the string so you can trust the reading while it decays.
Built for real strings
Tuned for the attack-and-decay shape of plucked and bowed instruments. Each string lights up individually so you know exactly which one you are tuning.
Cents, not guesses
See the signed cent offset as you approach the target. The color of the needle confirms when you are within five cents of center.
Works everywhere you practice
Desktop, laptop, phone, or tablet — as long as the browser can access a microphone, the tuner works. No app store involved.
When you reach for it
Moments when a free online tuner saves the day
Fiume is not only for the first minute of a rehearsal. Players keep it open whenever a string might drift.
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Before a session Check every string in under a minute before you start practicing, recording, or jamming.
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Between takes Catch the string that slipped after an hour of heavy bending or bowing, then get back to the part.
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New strings break-in Fresh strings stretch and go flat fast. Check them as you play them in, without switching tools.
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Alternate tunings Drop a cent or a whole step and confirm each string is right where you want it before tracking.
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Teaching a student Share a screen and let the learner see the needle move as they adjust — no separate hardware tuner needed.
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Travel and backup Pedal tuner at home? Bookmark this page as a free backup you can open on any device.
How to use it
From zero to tuned in three steps
01
Pick your instrument
Open the tuner, choose guitar, bass, violin, viola, cello, ukulele, or mandolin. Standard tuning is loaded by default.
02
Allow microphone once
Press start, grant the microphone permission. The signal analysis runs locally — nothing is uploaded.
03
Play each string
Fiume highlights the target string, shows the cent offset, and turns green when you are within five cents of center.
FAQ
Everything people ask before they try it
Is Fiume really free?
Yes. The tuner is free to use in the browser with no account, no trial, and no install. Premium features may come later for advanced workflows, but the core tuner stays free.
Which instruments does the tuner support?
Guitar, bass, violin, viola, cello, ukulele, and mandolin. Each one comes with its standard tuning preset and a per-string visual indicator.
Do I need to install anything?
No. Fiume runs fully in the browser. You only grant microphone access when you press start — nothing else.
How accurate is the tuner?
Fiume uses a real-time pitch detection engine that returns cent-level precision on clean, monophonic input. A quiet room and a clear signal from your instrument matter more than the hardware.
Does audio leave my device?
No. The audio is analyzed locally. Fiume does not upload or record what you play unless you explicitly choose to capture something in another mode.
Can I use it on my phone?
Yes. Fiume works on modern mobile browsers that can request microphone access. Holding the phone close to the instrument usually gives a cleaner signal.
Tune your instrument now — no signup, no install
Pick your instrument, play a string, and watch Fiume lock onto the pitch. All for free, directly in your browser.
Open the tunerFree to try. Microphone permission only when you start.