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Perfai Security vs three.dev
Short answer: Pick Perfai Security if you want continuous autonomous access-control testing; pick three.dev if you want live failure detection & automated fixes for AI agents. Perfai Security has a free plan, paid from $49/month; three.dev has a free plan, paid from $79/month.
Perfai Security1-prompt to find your app's live vulnerabilities in minutes.
three.devFind out how your AI agent fails. Before your users do.Which to pick
Pick Perfai Security if you want…
- Continuous autonomous access-control testing
- Live vulnerability detection
- The lower starting price: $49/month against $79/month
- Integrations with Bolt, v0 or Replit (on Perfai Security's list, not three.dev's)
Pick three.dev if you want…
- Live failure detection & automated fixes for AI agents
- Open-source code (round3ai/skills on GitHub, MIT license)
- Integrations with OpenAI, Anthropic or Gemini (on three.dev's list, not Perfai Security's)
Side by side
- What it is
- Perfai Security:Perfai Security automatically finds and fixes broken access controls in live apps.
- three.dev:three.dev scores live AI agent traffic, groups failures into modes, and helps coding agents fix them.
- Best for
- Perfai Security:Continuous autonomous access-control testing
- three.dev:Live failure detection & automated fixes for AI agents
- Who it’s for
- Perfai Security:Developers and security teams building AI-coded or vibe-coded applications.
- three.dev:Teams building production AI agents who need to detect and remediate failures.
- Pricing
- Perfai Security:Freemium
- three.dev:Freemium
- Starting price
- Perfai Security:$49/month (Pro)
- three.dev:$79/month (Starter)
- Free plan or trial
- Perfai Security:Free plan (Free) · Free trial
- three.dev:Free plan (Free)
- Plans
- Perfai Security:Free $0 · Pro $49/mo per month · Startup $299/mo per month
- three.dev:Free $0 per month · Starter $79 per month · Pro $249 per month
- Open source
- Perfai Security:—
- three.dev:Yes, 1 GitHub stars
- Works with
- Perfai Security:Cursor, Bolt, v0, Replit, Windsurf, Claude Code, GitHub Copilot, Devin
- three.dev:OpenAI, Anthropic, Gemini, Azure OpenAI, Claude Code, Cursor, Codex, MCP server
Perfai Security features
- Autonomous App Mapping. Maps workflows, endpoints and roles without source code access.
- 20,000+ Tests. Runs thousands of tests across 90+ categories with near-zero false positives.
- Auto-Fix Pull Requests. Generates vetted code patches for vulnerabilities and opens PRs or pushes to AI coding tools.
- Compliance Reports. Creates instant security and compliance reports for auditors.
- Continuous Testing. Provides monthly, bi-weekly, weekly or continuous testing based on plan.
- AI Platform Integrations. Supports Cursor, Replit, Claude Code, GitHub Copilot, and many other AI coding platforms.
three.dev features
- Live traffic scoring. Scores every production request in real-time with no added latency.
- Failure mode grouping. Aggregates similar issues into named failure modes ranked by severity.
- Evidence-backed issues. Each failure includes the exact line or prompt that caused it.
- Coding-agent integration (MCP). Your coding agent can query failure modes and apply fixes automatically.
- Before/after comparison. Compare metrics across two traffic slices to see impact of a fix.
- Chat interface. Ask natural-language questions about traffic and get links to underlying requests.
- Replay & experiment. Test new versions on recorded traffic before releasing to users.
Perfai Security vs three.dev FAQ
What is the difference between Perfai Security and three.dev?+
Perfai Security finds live vulnerabilities, whereas three.dev focuses on agent response failures.
Should I use Perfai Security or three.dev?+
Pick Perfai Security if you want continuous autonomous access-control testing, live vulnerability detection or the lower starting price: $49/month against $79/month. Pick three.dev if you want live failure detection & automated fixes for AI agents, open-source code (round3ai/skills on GitHub, MIT license) or integrations with OpenAI, Anthropic or Gemini (on three.dev's list, not Perfai Security's).
Is Perfai Security or three.dev free?+
Perfai Security has a free plan; paid plans start at $49/month (Pro). three.dev has a free plan; paid plans start at $79/month (Starter).
Which is cheaper, Perfai Security or three.dev?+
Perfai Security is cheaper to start with: Perfai Security's Pro plan ($49/month) against three.dev's Starter plan ($79/month).
Is Perfai Security or three.dev open source?+
three.dev is open source (round3ai/skills on GitHub, MIT license). DevHunt has no public source repository on record for Perfai Security.
Do Perfai Security and three.dev integrate with the same tools?+
Partly. Both list Cursor and Claude Code. Perfai Security also lists Bolt, v0, Replit, Windsurf and 6 more; three.dev also lists OpenAI, Anthropic, Gemini, Azure OpenAI and 2 more.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.