A agentindex
Comparison

Lunary vs Comet Opik

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

Lunary

Open-source LLM observability and prompt management.

  • + Lightweight and self-hostable
  • + Clean prompt-management UI
  • − Smaller community
  • − Eval features basic

Comet Opik

Open-source eval and tracing from Comet.

  • + Open source with self-host option
  • + Backed by Comet's MLOps experience
  • − Smaller community than Langfuse
  • − UI less polished than paid rivals
Spec Lunary Comet Opik
Role Observability Observability
Tags observability, prompt-management, persona-platform-engineer observability, evaluation, persona-data-scientist, persona-platform-engineer
License Apache-2.0 Apache-2.0
Open source Yes Yes
Self-hostable Yes Yes
MCP support No No
Pricing freemium freemium
Price Free tier Free tier
Usage cost No model cost No model cost
Models multi multi
Languages typescript python, typescript
GitHub stars — 20.3k
Last activity — 2026-07-03