Nullgen AI Blocker vs HeimWall

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Nullgen AI Blocker compared with HeimWall
Detail	Nullgen AI Blocker	HeimWall
What it does	Block AI on every device, from the prompt box to the app	Security monitoring for AI coding tools that detects secrets and PII before they're sent
Stage	Not given	Startup
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Not given
Pricing	Free extension forever with no account required. Family plan: 14 day trial, then $5.99/month for up to 4 children and 2 parents with dashboard and mobile apps. Enterprise plan: 30 day trial, then $10/seat/month for organizations.	Free individual app, forever. Team plans start at 10 seats with annual contracts; pricing quoted in writing per deployment. Enterprise plans available for large fleets.
Key features	Blocks AI prompts in browser Blocks 100+ known AI apps and websites On-device processing with no data collection Works across Chrome, Edge, Firefox, and Safari Mobile app for iOS and Android Centralized admin dashboard Access request approvals Real-time policy synchronization Force-install and pinning enforcement Zero-touch deployment via Intune, Jamf, Google Workspace, and Group Policy	Real-time warning as you type Supports Cursor, Claude Desktop, VS Code with Copilot, ChatGPT Desktop, and Windsurf Deterministic detection with no AI model Local detection with no network call Manager dashboard with category, severity, tool, and engineer information End-to-end encryption with manager-held keypair Per-organization hash chain audit trail macOS 13+ on Apple Silicon
What makes it different	Blocks prompts before they are sent, not just at the destination Single account manages browser, mobile, and desktop across the whole family or organization Free extension stays free forever with no account required No network changes, proxy, certificates, or DNS rules needed	Secrets are masked on the device before any record is created, so live secrets never reach company servers Deterministic regex rules instead of AI models, making detection explainable and consistent offline Contractual guarantee that detection data cannot be used for performance reviews
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	5 +3 (up) since last check
Trust Flow (Majestic)	1	3
Citation Flow (Majestic)	25	24
Referring domains (Majestic)	30	70

4 details filled in for both companies.

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