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Hidroly vs FillMeUp!: catalog facts
Hidroly	FillMeUp!
Free Free and open source under the GPL 3.0 license.	Free Free and open source under AGPL-3.0-only.
Android	Android
Simple water intake tracking with reminders Clean Material 3 design	One-tap water intake logging Customizable reminders that survive reboots
In maintenance mode, with few new features expected Android only	Android app
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: AGPL-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.