Phoenix vs OpenLLMetry: Which is Better in 2026?
Choosing between Phoenix and OpenLLMetry 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.
Bottom line: Phoenix is our overall pick for AI & automation workflows. Pick OpenLLMetry if you need DevOps.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Phoenix
Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing.
Best for you if:
- • You need AI & automation features specifically
- • Open-source LLM tracing and evaluation platform.
- • Provides real-time visibility, debugging, and optimization for AI products.
OpenLLMetry
Open-source observability for LLMs using OpenTelemetry.
Best for you if:
- • You need DevOps features specifically
- • Open-source observability for LLMs.
- • Uses OpenTelemetry for standardized data.
| At a Glance |  Phoenix |  OpenLLMetry |
|---|---|---|
Starts at | FreeFree tier available | FreeFree tier available |
Best For | AI & Automation | DevOps |
Rating | - | - |
Free plan | Yes | Yes |
Choose Phoenix or OpenLLMetry?
Choose Phoenix if
Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing.
- Open-source and self-hostable, offering flexibility and no vendor lock-in.
- Provides deep observability into LLM behavior and decision-making.
- Facilitates rapid experimentation and iteration with interactive playgrounds.
- Your work is AI & automation-shaped, not DevOps-shaped
Choose OpenLLMetry if
Open-source observability for LLMs using OpenTelemetry.
- Leverages open standards (OpenTelemetry)
- Easy integration with minimal code changes
- Supports both Python and TypeScript/Node.js
- Your work is DevOps-shaped, not AI & automation-shaped
| Feature | Phoenix | OpenLLMetry |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| User Rating | No ratings yet | No ratings yet |
| Categories | AI & AutomationDeveloper Tools | DevOpsAnalytics |
In-Depth Analysis
Phoenix
Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing.
Strengths
- +Open-source and self-hostable, offering flexibility and no vendor lock-in.
- +Provides deep observability into LLM behavior and decision-making.
- +Facilitates rapid experimentation and iteration with interactive playgrounds.
- +Supports both automated and human feedback for comprehensive evaluations.
- +Strong community support and integrations with popular LLM frameworks.
Weaknesses
- -Advanced features like dedicated support and custom data limits are only available in higher-tier paid plans.
- -The free SaaS tier has limited trace spans and ingestion volume.
- -Requires some technical expertise for self-hosting and full utilization.
Key features
Value 85/100. Phoenix offers a very generous free tier with its open-source solution and a substantial free tier for AX, making it highly accessible.
Watch out: Overage fees for exceeding trace spans/ingestion
OpenLLMetry
Open-source observability for LLMs using OpenTelemetry.
Strengths
- +Leverages open standards (OpenTelemetry)
- +Easy integration with minimal code changes
- +Supports both Python and TypeScript/Node.js
- +Provides visibility into LLM application workflows
- +Vendor-neutral for data export
Weaknesses
- -Requires an OpenTelemetry backend for full visualization
- -Limited information on advanced features or customization options from the provided content
Key features
Value 85/100. OpenLLMetry offers a generous "Free Forever" tier with up to 50K spans/month, which is excellent for small projects and individual developers.
Watch out: Enterprise pricing is opaque, requiring direct contact.
Pricing: Phoenix vs OpenLLMetry
| Plan | Phoenix | OpenLLMetry |
|---|---|---|
| Tier 1 | Free & open source Phoenix Small teams and smaller data | $0 / mo Free Forever |
| Tier 2 | Free AX Free | Contact us Enterprise |
| Tier 3 | $50 per month AX Pro | N/A |
| Tier 4 | Custom AX Enterprise | N/A |
Pricing verified from each vendor's public pricing page. Compare in detail on Phoenix pricing and OpenLLMetry pricing.
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: Phoenix
Want the highest-rated option?
Neither has ratings yet.
Too early to call on ratings — compare on features and pricing.
Value user reviews?
Neither has ratings yet.
Too early to call — neither has ratings yet.
3 Questions to Help You Decide
What's your budget?
Both are freemium. Pricing won't help you decide here.
What's your use case?
Phoenix is a AI & automation tool. OpenLLMetry is in DevOps. Pick the category that matches your needs.
How important are ratings?
Neither has ratings yet.
Key Takeaways
Phoenix
- Free tier available
- Our pick for this comparison
OpenLLMetry
- Better fit for DevOps
The Bottom Line
Phoenix is our pick.
Frequently Asked Questions
Is Phoenix or OpenLLMetry better?
Phoenix is rated in our evaluation. Both are freemium.
What are Phoenix and OpenLLMetry used for?
Phoenix: Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing.. OpenLLMetry: Open-source observability for LLMs using OpenTelemetry..
What does Phoenix cost vs OpenLLMetry?
Phoenix is freemium (free tier + paid plans). OpenLLMetry is freemium (free tier + paid plans). Visit their websites for detailed pricing.