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Nullgen AI Blocker vs Preflight

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 Preflight
DetailNullgen AI Blocker logo Nullgen AI BlockerPreflight logo Preflight
What it doesBlock AI on every device, from the prompt box to the app Security scan for Supabase apps built with AI tools
StageNot given Not given
FoundedNot given Not given
Based inNot given CR
Pricing modelFreemium Not given
PricingFree 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 scan included with every app. Proof Report $29 one-time for Supabase apps. Monitor $12/mo (founding price until November 20, 2026, then $19/mo) for weekly outside checks on up to 3 apps. Launch Pack $79 one-time for Proof Reports on up to 3 apps with 90 days of re-scans.
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
  • Read-only security scan checking for exposed tables, API keys, and files
  • Two-user cross-account access testing as signed-in users
  • Automated privilege escalation testing
  • Dated evidence report for customers and compliance
  • Rerunnable curl requests for each finding
  • Weekly monitoring of outside security checks
  • Support for apps without Supabase
  • No service role key required
  • Test data marked and removed automatically
  • 14-day refund guarantee
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
  • Tests live apps as two real users, not just configuration linting
  • Built-in checks mostly read setup; Preflight signs in as two users and tries to read across them
  • No code upload or service role key needed
  • Automated checks with human-readable fix prompts and SQL
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)Not checked yet no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)10
Citation Flow (Majestic)250
Referring domains (Majestic)300

4 details filled in for both companies.

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