Free Online C Trumpet Tuner
Play a note, see exactly how in tune you are.
A simplified preview of what the Tunable app does. Get the full app
Allow microphone access to begin
How to use this tuner
Click Start Tuning and allow microphone access. Play a note, the tuner detects pitch in real time and shows how sharp or flat you are in cents.
The bar spans −50 to +50 cents. Zero is perfectly in tune. The history line shows where you’ve been, useful for catching pitch drift as embouchure tires on long orchestral phrases.
Concert Pitch (C) is selected, no transposition. Every note the C trumpet plays is shown exactly as the ensemble hears it. If you need Bb trumpet transposition, select Trumpet (B♭) from the dropdown.
Default is A440. Tap + / − to match your ensemble, A441–442 is common in orchestras, A415 for historical pitch.
The C trumpet is the standard in American orchestras and plays at concert pitch, no transposition offset. When you play a C, the tuner shows C, and the rest of the ensemble hears C. This is a meaningful practical difference from the Bb trumpet: a C trumpet player reading the same orchestral passage as a Bb player sees different note names on the page, because C trumpet parts are written at concert pitch while Bb parts are written a whole step higher. C trumpets tend to have a brighter, more penetrating tone in the upper registers, which is why they’re preferred for orchestral work where projection matters. Intonation tendencies are similar to the Bb: valve combinations involving all three valves (1+2+3) run flat on most instruments, and the open C tends sharp on many horns. The main tuning slide handles overall pitch; individual valve slides address specific problem notes. The pitch history display lets you monitor whether sustained orchestral notes drift across a long phrase, a common issue as air support fluctuates through a demanding passage.
Want the complete experience?
The Tunable app adds 15+ tuning temperaments, metronome, tone generator, recording, ear training, and more, all on your phone.