Open Core
CertainLogic is Open Core
Our hallucination guard and fact pipeline are open source. Free CLI includes 100 verified facts. Upgrade to the Coder Pack for 158 facts + unlimited API access.
Free / Open Core
No CC Required$0/mo
- 100 essential verified facts in CLI (offline, forever)
- Open source hallucination guard
- Community support
Coder Pack
Available Now$69 one-time
+$9.99/mo optional updates
- 333 verified developer facts
- Unlimited Brain API queries
- Pre-warmed cache (no cold starts)
Our Open Source Repositories
Built in public. Audit the code, contribute, or fork for your own use.
hallucination-guard
Standalone hallucination detection library. Pip installable, runs anywhere.
Python Apache 2.0
certainlogic-mcp
MCP server integration for Claude, Cursor, and other AI agents.
Python MIT
gbrain-integration
GBrain skill file — verified facts for the GBrain agent runtime.
JSON MIT
All integrations ship with full documentation, test suites, and setup guides.
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Quick Start
Validate an AI response in seconds:
Or install the Python package:
pip install certainlogic-validator