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Free tools
for working musicians.
Single-shot audio tools that solve one problem fast, with no account at all. Use them once, or graduate to the full stempo app — where every song you upload is prepared in standard and E♭ tuning, and you can take the guitar out of the mix and play that part yourself.
Tool / 01
Key Changer
Pitch-shift supported audio up or down by semitones — without changing the tempo. Match your tuning, transpose for a different singer, or just find a more comfortable key.
Open tool →Tool / 02
Song Slowdown
Slow down a track to whatever speed you can follow — without changing the pitch. Best friend of every musician learning a fast solo by ear.
Open tool →More than one song?
Keep your whole library
in one place.
The full stempo app combines every one of these tools into a single library for working musicians. Process every song you play, organize them into playlists, and play from a cockpit designed to be used while you're holding an instrument.
Try stempo free →