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Aard 2 vs Notification Dictionary: catalog facts
Aard 2	Notification Dictionary
Free Free and open source under the GPL-3.0.	Free Free and open source under the MIT license.
Android	Android
Offline Wikipedia and dictionary lookups Bookmarks and lookup history	Works in any app that supports text selection Definitions appear without leaving the current app
Dictionary files must be downloaded separately Interface is plain	Android only Depends on each app supporting text selection
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
No account needed	Not stated if an account is needed
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 October 2, 2026

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