Proprietary freemium
In these stacks
LicenseProprietary
PriceFree
UsageNo model cost
Price detailFree developer tier
Model supportmulti
Languagespython, typescript
GitHub stars—
Last activity—
VerifiedThu Jun 25 2026 00:00:00 GMT+0000 (Coordinated Universal Time)
Verified byseed
A platform for tracing, evaluating, and monitoring LLM applications, with the tightest fit for LangChain and LangGraph stacks.
Strengths
- Best-in-class when you already use LangChain
- Strong tracing UX
Tradeoffs
- Proprietary and cloud-only
- Vendor lock-in to LangChain