Lexem is the version control and testing platform for AI prompts. Commit, diff, branch, rollback, run evals, and deploy LLM prompts safely with eval-gated promotions, regression detection, and a TypeScript/Python SDK.
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Maker
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Built Lexem because prompt engineering deserved the same discipline we already expect from code.
Lexem gives AI prompts:
* Version control with commits, diffs, branching, merges, and one-click rollback
* Eval + regression testing with exact match, regex, and LLM-as-judge scoring
* AI-generated test cases for happy paths, edge cases, and refusals
* AI diff analysis that explains prompt changes and potential risks in plain English
* Eval-gated deploys across dev, staging, and prod
* Token analytics per version and across prompts
* SDKs for TypeScript + Python to ship prompt updates without app redeploys
* Fully open-source + self-hostable on your own Postgres
The goal was simple: make prompt iteration safer, testable, and production-ready.