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openScale vs Hacker's Diet Offline: catalog facts
openScale	Hacker's Diet Offline
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-2.0-or-later license.
Android	Android
Supports many Bluetooth smart scales without vendor apps No account required	Tracks weight and exercise Uses a weighted moving average to show weight trends
Android only Google Play version is offered as an open beta	Android only Online synchronization is optional and uses Hacker's Diet Online
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0-or-later
No account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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