BlockBlock review
A focused, free monitor for macOS persistence changes—not a complete antivirus suite.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
BlockBlock is a free, open-source macOS security utility from Objective-See Foundation. It monitors common persistence locations, including items configured to launch at login or restart, then alerts when a new persistent component is added. Users can allow or block each change, making it a focused option for Mac users who want visibility into software that attempts to remain active after login or restart.
The published product details show a free tool with no paid tiers to compare. Its protection is real time within its defined scope, and optional controls can block non-notarized programs, downloaded scripts, and terminal pastes. Alerts include process and persistence details, along with code-signing, VirusTotal, and ancestry information. Users can also create rules to remember responses, while alert decisions are logged locally. Initial setup includes macOS 10.15 or later and Full Disk Access, so it suits users comfortable granting the required system permission.
BlockBlock’s main strength is focus: it concentrates on persistence changes rather than presenting itself as a complete antivirus suite. That narrow scope can make its alerts easier to interpret when the concern is new login items, launch agents, or other persistent components, while the optional protections extend monitoring into several related behaviors. Choose BlockBlock if free, open-source persistence monitoring is the priority. Choose a broader antivirus product instead if you need protection beyond macOS persistence locations or a wider security feature set.
BlockBlock pros and cons
- Where it wins
- Monitors common macOS persistence locations in real time
- Lets users block or allow changes and save response rules
- Shows process, signing, VirusTotal, and ancestry details
- Where it doesn't
- Covers macOS only
- Requires macOS 10.15 or later and Full Disk Access
- Focused on persistence rather than full antivirus coverage
BlockBlock fact sheet, pricing and score →
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