Comet ML 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 Comet ML and Phoenix side by side. This page compares data; it is not a hands-on review.
On the data: On the data below, Comet ML leads on lower entry price; Phoenix leads on a free plan. We do not name an overall 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:
Comet ML
Machine learning experiment tracking platform
Best for you if:
- • You want experiment tracking
Phoenix
Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing.
Best for you if:
- • You want a free tier before you commit
| At a Glance | Comet ML | Phoenix |
|---|---|---|
Starts at | From $19/user/mo, billed monthly Pro plan | Free plan, paid from $50/mo, billed monthly AX Pro plan |
Category | Analytics Developer Tools | Developer Tools Analytics |
Rating | 4.3/5 G2 4.3 26 reviews | n/a |
Free plan | No | Yes |
Watch out for | Overage fees for training hours on Pro tier | Overage fees for exceeding trace spans/ingestion |
Choose Comet ML or Phoenix?
Choose Comet ML if
- You want experiment tracking
- You want model production monitoring
- Budget matters ($19/user/mo, billed monthly vs $50/mo, billed monthly)
- You work in analytics, not developer tools
Choose Phoenix if
- You want a free tier before you commit
- 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 analytics
In-Depth Analysis
Comet ML
Machine learning experiment tracking platform
Comet ML's pricing is quite generous, especially with a robust Free tier offering 100GB storage and core tracking.
Watch out
Overage fees for training hours on Pro tier
Strengths
- Pro: Experiment tracking
- Pro: Model production monitoring
- Pro: Good visualizations
- Pro: Fair pricing
- Pro: LLM support
Weaknesses
- Con: Less known
- Con: Smaller community
- Con: Some features basic
- Con: Documentation gaps
- Con: Integration limitations
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: Comet ML vs Phoenix
| Tool | Plans and prices | Source |
|---|---|---|
| Comet ML |
| comet.com/pricing read Oct 4, 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 Comet ML pricing and Phoenix pricing.
Key Takeaways
Comet ML
- Lower entry price: $19/user/mo, billed monthly vs $50/mo, billed monthly
Phoenix
- Has a free plan
What the data shows
On the data below, Comet ML leads on lower entry price; Phoenix leads on a free plan. We do not name an overall winner for this pair.
- Only Comet ML has a published user rating (4.3/5 from 26 reviews); Phoenix has none we can show.
- Comet ML has the lower entry price: $19/user/mo, billed monthly (Pro) against $50/mo, billed monthly (AX Pro) for Phoenix.
- Only Phoenix has 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 Comet ML and Phoenix compare in 2026?
On the data below, Comet ML leads on lower entry price; Phoenix leads on a free plan. We do not name an overall winner for this pair. Only Comet ML has a published user rating (4.3/5 from 26 reviews); Phoenix has none we can show. Comet ML has the lower entry price: $19/user/mo, billed monthly (Pro) against $50/mo, billed monthly (AX Pro) for Phoenix. Only Phoenix has a free plan.
What are Comet ML and Phoenix used for?
Comet ML: Machine learning experiment tracking platform. Phoenix: Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing.
What does Comet ML cost vs Phoenix?
Comet ML's cheapest paid plan is Pro at $19/user/mo, billed monthly. 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 Comet ML and Phoenix?
Comet ML's main strength: experiment tracking. Phoenix's main strength: open-source and self-hostable, offering flexibility and no vendor lock-in.