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