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BlockBlock vs OverSight: catalog facts
BlockBlock	OverSight
Free Free, with source code published on GitHub.	Free The open-source software is available without a license fee. Hosting, hardware and…
macOS	macOS
Real-time alerts for new launch items and other persistence Built on Apple's Endpoint Security Framework	Makes supported capture-device access visible to the user.
macOS only, version 10.15 or later Requires Full Disk Access and admin authorization	It monitors access rather than deciding whether a recording is appropriate.
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
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 September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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