Keywords AI vs Opik by Comet: Which Should You Choose in 2026?
Choosing between Keywords AI and Opik by Comet comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
By Toolradar Team · Last updated February 28, 2026 · Methodology
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Keywords AI
The AI gateway with built-in observability for LLM applications.
Best for you if:
- • Unified platform for building, testing, and monitoring LLM applications.
- • Integrates with existing codebases using an OpenAI-compatible API.
Opik by Comet
Track, evaluate, and optimize your LLM applications, RAG systems, and agentic workflows.
Best for you if:
- • You need something completely free
- • Open-source platform for LLM application evaluation and monitoring.
- • Automates prompt and agent optimization with multiple powerful optimizers.
| At a Glance |  Keywords AI |  Opik by Comet |
|---|---|---|
Price | Free + Paid | Free |
Best For | Debugging | Debugging |
Rating | —/100 | —/100 |
| Feature | Keywords AI | Opik by Comet |
|---|---|---|
| Pricing Model | Freemium | Free |
| Editorial Score | — | — |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | DebuggingMonitoring | DebuggingMonitoring |
How Keywords AI and Opik by Comet Compare
Keywords AI
The AI gateway with built-in observability for LLM applications.
Free tier available
Opik by Comet
Track, evaluate, and optimize your LLM applications, RAG systems, and agentic workflows.
Free
Who Should Use What?
On a budget?
Opik by Comet is free. Keywords AI is freemium.
Go with: Opik by Comet
Want the highest-rated option?
Neither has been rated yet.
Go with: Keywords AI
Value user reviews?
Neither has user reviews yet.
Go with: Keywords AI
3 Questions to Help You Decide
What's your budget?
Keywords AI is freemium. Opik by Comet is free. Go with Opik by Comet if free matters most.
What's your use case?
Both are debugging tools. Compare their specific features to decide.
How important are ratings?
Not all tools have been rated yet.
Key Takeaways
Keywords AI
- Free tier available
- Our pick for this comparison
Opik by Comet
- Completely free
The Bottom Line
Keywords AI is our pick. That said, Opik by Comet is free — hard to beat on price.
Frequently Asked Questions
Is Keywords AI or Opik by Comet better?
Keywords AI scores high/100 in our evaluation. Keywords AI is freemium and Opik by Comet is free.
What are Keywords AI and Opik by Comet used for?
Keywords AI: The AI gateway with built-in observability for LLM applications.. Opik by Comet: Track, evaluate, and optimize your LLM applications, RAG systems, and agentic workflows..
What does Keywords AI cost vs Opik by Comet?
Keywords AI is freemium (free tier + paid plans). Opik by Comet is completely free. Visit their websites for detailed pricing.