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Notification Dictionary vs Aard 2: catalog facts
Notification Dictionary	Aard 2
Free Free and open source under the MIT license.	Free Free and open source under the GPL-3.0.
Android	Android
Works in any app that supports text selection Definitions appear without leaving the current app	Offline Wikipedia and dictionary lookups Bookmarks and lookup history
Android only Depends on each app supporting text selection	Dictionary files must be downloaded separately Interface is plain
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
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.