Phoenix vs Weights & Biases: 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 Phoenix and Weights & Biases side by side. This page compares data; it is not a hands-on review.
On the data: On the data below, Phoenix leads on lower entry price. 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:
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
Weights & Biases
Track, compare, and share ML experiments and models
Best for you if:
- • You want great visualizations
| At a Glance | Phoenix | Weights & Biases |
|---|---|---|
Starts at | Free plan, paid from $50/mo, billed monthly AX Pro plan | Free plan, paid from $60/mo, billed monthly Pro plan |
Category | Developer Tools Analytics | Developer Tools Analytics |
Rating | n/a | 4.6/5 G2 4.6 57 reviews |
Free plan | Yes | Yes |
Watch out for | Overage fees for exceeding trace spans/ingestion | Overage fees for storage/Weave data on Free tier |
Choose Phoenix or Weights & Biases?
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
- Budget matters ($50/mo, billed monthly vs $60/mo, billed monthly)
Choose Weights & Biases if
- You want great visualizations
- You want team collaboration
In-Depth Analysis
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
Weights & Biases
Track, compare, and share ML experiments and models
The pricing for Weights & Biases is fair, offering a generous Free tier and a competitive Pro tier at $60/month.
Watch out
Overage fees for storage/Weave data on Free tier
Strengths
- Pro: Great visualizations
- Pro: Team collaboration
- Pro: Free tier
Weaknesses
- Con: Learning curve
- Con: Can be slow
Key features
Plans and prices: Phoenix vs Weights & Biases
| Tool | Plans and prices | Source |
|---|---|---|
| Phoenix |
| phoenix.arize.com/pricing read Oct 13, 2026 |
| Weights & Biases |
| wandb.ai/pricing read Oct 16, 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 Phoenix pricing and Weights & Biases pricing.
Key Takeaways
Phoenix
- Lower entry price: $50/mo, billed monthly vs $60/mo, billed monthly
Weights & Biases
- Choose if you want track, compare, and share ML experiments and models
What the data shows
On the data below, Phoenix leads on lower entry price. We do not name an overall winner for this pair.
- Only Weights & Biases has a published user rating (4.6/5 from 57 reviews); Phoenix has none we can show.
- Phoenix has the lower entry price: $50/mo, billed monthly (AX Pro) against $60/mo, billed monthly (Pro) for Weights & Biases.
- 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 Phoenix and Weights & Biases compare in 2026?
On the data below, Phoenix leads on lower entry price. We do not name an overall winner for this pair. Only Weights & Biases has a published user rating (4.6/5 from 57 reviews); Phoenix has none we can show. Phoenix has the lower entry price: $50/mo, billed monthly (AX Pro) against $60/mo, billed monthly (Pro) for Weights & Biases. Both have a free plan.
What are Phoenix and Weights & Biases used for?
Phoenix: Evaluate, experiment, and optimize AI products in real time with open-source LLM tracing. Weights & Biases: Track, compare, and share ML experiments and models.
What does Phoenix cost vs Weights & Biases?
Phoenix's cheapest paid plan is AX Pro at $50/mo, billed monthly; it also has a free plan. Weights & Biases's cheapest paid plan is Pro at $60/mo, billed monthly; it also has a free plan. Prices read on the vendors' pricing pages, latest check Oct 16, 2026.
What's the main difference between Phoenix and Weights & Biases?
Phoenix's main strength: open-source and self-hostable, offering flexibility and no vendor lock-in. Weights & Biases's main strength: great visualizations.