Arize AI vs WhyLabs: Which Should You Choose in 2026?
Choosing between Arize AI and WhyLabs 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:
Arize AI
The AI & Agent Engineering Platform for LLM observability, evaluation, and development.
Best for you if:
- • You need ai agents features specifically
- • Unified platform for LLM observability, evaluation, and development.
- • Provides tools for prompt optimization, LLM-as-a-Judge, and real-time monitoring.
WhyLabs
Open-source tools for responsible AI observability and monitoring.
Best for you if:
- • You need something completely free
- • You need log management features specifically
- • WhyLabs, Inc. has ceased operations.
- • The entire WhyLabs platform has been open-sourced for AI observability research.
| At a Glance |  Arize AI | |
|---|---|---|
Price | Free + Paid | Free |
Best For | AI Agents | Log Management |
Rating | —/100 | —/100 |
| Feature | Arize AI | WhyLabs |
|---|---|---|
| Pricing Model | Freemium | Free |
| Editorial Score | — | — |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | AI AgentsAI Model Deployment | Log ManagementData Quality |
How Arize AI and WhyLabs Compare
Arize AI
The AI & Agent Engineering Platform for LLM observability, evaluation, and development.
Free tier available
WhyLabs
Open-source tools for responsible AI observability and monitoring.
Free
Arize AI is a ai agents tool. WhyLabs is in log management.
Who Should Use What?
On a budget?
WhyLabs is free. Arize AI is freemium.
Go with: WhyLabs
Want the highest-rated option?
Neither has been rated yet.
Go with: Arize AI
Value user reviews?
Neither has user reviews yet.
Go with: Arize AI
3 Questions to Help You Decide
What's your budget?
Arize AI is freemium. WhyLabs is free. Go with WhyLabs if free matters most.
What's your use case?
Arize AI is a ai agents tool. WhyLabs is in log management. Pick the category that matches your needs.
How important are ratings?
Not all tools have been rated yet.
Key Takeaways
Arize AI
- Free tier available
- Our pick for this comparison
WhyLabs
- Completely free
- Better fit for log management
The Bottom Line
Arize AI is our pick. That said, WhyLabs is free — hard to beat on price.
Frequently Asked Questions
Is Arize AI or WhyLabs better?
Arize AI scores high/100 in our evaluation. Arize AI is freemium and WhyLabs is free.
What are Arize AI and WhyLabs used for?
Arize AI: The AI & Agent Engineering Platform for LLM observability, evaluation, and development.. WhyLabs: Open-source tools for responsible AI observability and monitoring..
What does Arize AI cost vs WhyLabs?
Arize AI is freemium (free tier + paid plans). WhyLabs is completely free. Visit their websites for detailed pricing.