| What it does | Open source code review inside your coding agent before you push
| Test and guard AI agents with outcome verification, not reply verification
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| Stage | Startup
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| Founded | 2024
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| Based in | US
| IT
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| Pricing model | Open source
| Freemium
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| Pricing | Free. Open source under Apache 2.0 license.
| Free: €0/month with 100 test runs per month; Test: €19/month with 2,000 runs per month; Guard: €99/month with unlimited runs plus live guard features. AI usage is metered separately at cost.
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| Key features | - 22 built-in scanners for secrets, security, dependencies and lint errors
- Code graph showing callers and importers of changed code
- Separate reviewer process using Claude Code or Codex
- Script-based validation of review completeness
- Works with Claude Code, Cursor, Codex and Cline
- Terminal, agent and CI integration
- GitHub Action for pull request reviews
- Pre-commit and pre-push hooks
- Custom scanner configuration from GitHub
- No telemetry or data collection
| - Isolated sandbox with fresh fake accounts for testing
- 88 scenario templates for refunds, cancellations, pauses and plan changes
- CI gate and CLI with dependency-free deployment
- Policy gate with ALLOW/REVIEW/HOLD/DENY decisions
- Human approval for risky actions
- Independent verification of outcome against ground-truth state
- Guardrails with prompt injection and PII detection
- Per-end-user spending caps in rolling windows
- Append-only evidence log with JSON, CSV and PDF export
- GitHub Action integration for automated testing
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| What makes it different | - No API key, account or server required - runs entirely on your local machine
- Separate reviewer process with no memory of the coding session that produced the code
- Open source Apache 2.0 license with full transparency
- Integrated directly into coding agents without additional configuration
- Findings only on changed lines, not whole repository
| - Deterministic verdicts from explicit state checks, not language model decisions
- No-cost deterministic testing; AI features are optional and separately metered
- Integrated sandbox testing and production guarding in one platform
- Idempotent and exactly-once action execution with retry safety
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 42 ▲ +1 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 17 | 0 |
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| Citation Flow (Majestic) | 22 | 0 |
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| Referring domains (Majestic) | 316 | 0 |
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COLVO