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Emerald Dialer vs Phone (cz.mts): catalog facts
Emerald Dialer	Phone (cz.mts)
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0 license.
Android	Android
T9 contact search from the number pad Speed dial	Includes a dialer and contact management Can allow calls only from saved contacts
Deliberately minimal feature set Android only	Android 9 or later Optional spam checking sends unknown caller numbers to third-party databases
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
Not stated if an account is needed	Not stated if an account is 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 8, 2026

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