THE COMPARISON / A CLOSER LOOK
Opik by Comet vs Helicone
Compare the listed plans, useful capabilities, and practical tradeoffs.
Prices and features reflect editorial records. Check vendor terms before you buy; documentary checks do not imply hands-on testing.
Opik by Comet
🔴DeveloperLLM Observability & Evals
Open-source LLM evaluation and observability framework: trace, evaluate, monitor, and improve LLM applications.
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Starting Price
FreeHelicone
🔴DeveloperAI Monitoring
Open-source LLM observability and gateway platform offering one-line integration, request logging, prompt management, evals, and a multi-provider proxy.
SOURCE-CHECK COVERAGE
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Starting Price
FreeFeature Comparison
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Opik by Comet - Pros & Cons
Pros
- ✓True Apache 2.0 open source with a self-hostable backend — no source-available rug pull risk
- ✓SDKs for Python, TypeScript, and Ruby (Ruby support is uncommon among competitors)
- ✓Wide framework coverage: LangChain, LlamaIndex, LiteLLM, CrewAI, AutoGen, DSPy
- ✓Free hosted cloud is genuinely usable for individuals and small teams
- ✓Backed by Comet's mature ML observability lineage, not a brand-new startup
Cons
- ✗Self-hosting Opik requires real DevOps work — not a Docker-and-forget situation at scale
- ✗Some evaluators are still maturing compared to specialist eval tools like Braintrust
- ✗Team-tier pricing is gated behind sales contact
- ✗Ecosystem is smaller than LangSmith for LangChain-specific workflows
Helicone - Pros & Cons
Pros
- ✓Truly one-line integration — fastest path to LLM logging in the market
- ✓Open source under Apache 2.0 with viable self-host story (not just open-core marketing)
- ✓Generous 10,000-request free tier covers most prototypes and small side projects
- ✓Gateway + observability in one tool reduces vendor count for small teams
- ✓Vault feature lets you put provider keys server-side without rewriting the client
Cons
- ✗Proxy adds 50–200ms latency in some regions versus calling the provider directly
- ✗Async/log-only mode exists but loses many gateway features (caching, fallback)
- ✗Trace/session UI is less polished than LangSmith for deeply nested agent runs
- ✗$79 → $799 jump from Pro to Team is steep if you only need SSO
- ✗Self-host docs assume Kubernetes/Postgres comfort; not push-button
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