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Recoll vs dnGrep: catalog facts
Recoll	dnGrep
Free Free and open source under the GPL.	Free The open-source application is available without a license fee.
Windows, macOS, Linux, Browser extension	Windows
Handles an unusually wide range of formats, including mail folders Powerful query language with stemming, fields and proximity	Searches both ordinary text and supported document formats
Format support depends on external helper programs being installed The Qt interface is functional rather than polished	Available for Windows only.
Downloadable app, Browser extension	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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