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G-Shock Smart Sync vs Gadgetbridge: catalog facts
G-Shock Smart Sync	Gadgetbridge
Free Free and open source.	Free Free and open source, funded by donations.
Android	Android
No Casio ID needed Supports G-Shock, Edifice and Pro Trek models	Replaces proprietary companion apps for many wearables Supports a very wide range of device types
Unofficial and not supported by Casio Android only	Android only Some devices need extra pairing steps or vendor keys
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License not stated
No account needed	No account needed
Not stated if it 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 September 23, 2026

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