OpenLLMetry vs Phoenix: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for OpenLLMetry and Phoenix side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
OpenLLMetry
Open-source observability for LLMs using OpenTelemetry.
Best for you if:
- • You want leverages open standards (OpenTelemetry)
Phoenix
Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing.
Best for you if:
- • You want open-source and self-hostable, offering flexibility and no vendor lock-in
| At a Glance | OpenLLMetry | Phoenix |
|---|---|---|
Starts at | Free plan | Free plan, paid from $50/mo, billed monthly AX Pro plan |
Category | Monitoring DevOps | Developer Tools Analytics |
Rating | n/a | n/a |
Free plan | Yes | Yes |
Watch out for | No clear pricing for exceeding 50K spans/month on free tier. | Overage fees for exceeding trace spans/ingestion |
Choose OpenLLMetry or Phoenix?
Choose OpenLLMetry if
- You want leverages open standards (OpenTelemetry)
- You want easy integration with minimal code changes
- You work in monitoring, not developer tools
Choose Phoenix if
- You want open-source and self-hostable, offering flexibility and no vendor lock-in
- You want provides deep observability into LLM behavior and decision-making
- You work in developer tools, not monitoring
In-Depth Analysis
OpenLLMetry
Open-source observability for LLMs using OpenTelemetry.
OpenLLMetry offers a generous "Free Forever" tier with up to 50K spans/month, which is excellent for small projects and individual developers.
Watch out
No clear pricing for exceeding 50K spans/month on free tier.
Strengths
- Pro: Leverages open standards (OpenTelemetry)
- Pro: Easy integration with minimal code changes
- Pro: Supports both Python and TypeScript/Node.js
- Pro: Provides visibility into LLM application workflows
- Pro: Vendor-neutral for data export
Weaknesses
- Con: Requires an OpenTelemetry backend for full visualization
- Con: Limited information on advanced features or customization options from the provided content
Key features
Phoenix
Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing.
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
Strengths
- Pro: Open-source and self-hostable, offering flexibility and no vendor lock-in.
- Pro: Provides deep observability into LLM behavior and decision-making.
- Pro: Facilitates rapid experimentation and iteration with interactive playgrounds.
- Pro: Supports both automated and human feedback for comprehensive evaluations.
- Pro: Strong community support and integrations with popular LLM frameworks.
Weaknesses
- Con: Advanced features like dedicated support and custom data limits are only available in higher-tier paid plans.
- Con: The free SaaS tier has limited trace spans and ingestion volume.
- Con: Requires some technical expertise for self-hosting and full utilization.
Key features
Plans and prices: OpenLLMetry vs Phoenix
| Tool | Plans and prices | Source |
|---|---|---|
| OpenLLMetry |
| traceloop.com/pricing read Oct 2, 2026 |
| Phoenix |
| phoenix.arize.com/pricing read Oct 13, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on OpenLLMetry pricing and Phoenix pricing.
Key Takeaways
OpenLLMetry
- Choose if you want open-source observability for LLMs using OpenTelemetry
Phoenix
- Choose if you want evaluate, experiment, and optimize AI products in real time with open-source LLM tracing
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- Phoenix starts at $50/mo, billed monthly; OpenLLMetry has no public paid plan price on file.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do OpenLLMetry and Phoenix compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. Phoenix starts at $50/mo, billed monthly; OpenLLMetry has no public paid plan price on file. Both have a free plan.
What are OpenLLMetry and Phoenix used for?
OpenLLMetry: Open-source observability for LLMs using OpenTelemetry. Phoenix: Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing.
What does OpenLLMetry cost vs Phoenix?
OpenLLMetry has no public paid-plan price on file. Phoenix's cheapest paid plan is AX Pro at $50/mo, billed monthly; it also has a free plan. Prices read on the vendors' pricing pages, latest check Oct 13, 2026.
What's the main difference between OpenLLMetry and Phoenix?
OpenLLMetry's main strength: leverages open standards (OpenTelemetry). Phoenix's main strength: open-source and self-hostable, offering flexibility and no vendor lock-in.