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Signal Generator vs Tuning fork: catalog facts
Signal Generator	Tuning fork
Free Free and open source under the GPL.	Free Free and open source under the MIT licence.
Android	Android
Wide range from 0.1 Hz to 25 kHz Fine sliders for frequency and level	Plays a reference tone on demand Simple and focused on tuning by ear
Documentation is a short wiki page Output quality depends on the phone's audio hardware	No visual pitch detection like a chromatic tuner
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: MIT
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.