Proprietary freemium
In these stacks
LicenseProprietary
PriceFree tier
UsageNo model cost
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 pre-production evaluation and simulation of prompts and agents before they ship.
Strengths
- Simulation and prompt-testing focus
- Good pre-production workflows
Tradeoffs
- Proprietary
- Narrower than full observability suites