Arize AI vs Langfuse: 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 Arize AI and Langfuse 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:
Arize AI
The AI & Agent Engineering Platform for LLM observability, evaluation, and development.
Best for you if:
- • You want a tool that provides a comprehensive, unified platform for the entire AI lifecycle from development to production
Langfuse
Open Source LLM Engineering Platform for debugging and improving your LLM application.
| At a Glance | Arize AI | Langfuse |
|---|---|---|
Starts at | Free plan, paid from $50/mo, billed monthly AX Pro plan | Free plan, paid from $29/mo flat, billed monthly Core plan |
Category | AI Observability AI Agents | Developer Tools AI Observability |
Rating | 4.3/5 G2 4.3 48 reviews | n/a |
Free plan | Yes | Yes |
Watch out for | Self-hosting is an Enterprise add-on | Usage beyond included units at $8/100k units (graduated, lower with volume) |
Choose Arize AI or Langfuse?
Choose Arize AI if
- You want a tool that provides a comprehensive, unified platform for the entire AI lifecycle from development to production
- You want a tool that offers advanced evaluation capabilities like LLM-as-a-Judge and human annotation for robust AI
Choose Langfuse if
- You need developer tools features specifically.
In-Depth Analysis
Arize AI
The AI & Agent Engineering Platform for LLM observability, evaluation, and development.
Arize AI offers a generous free tier (AX Free) and an open-source option (Phoenix), making it highly accessible for individual developers and small teams.
Watch out
Self-hosting is an Enterprise add-on
Strengths
- Pro: Provides a comprehensive, unified platform for the entire AI lifecycle from development to production.
- Pro: Offers advanced evaluation capabilities like LLM-as-a-Judge and human annotation for robust AI.
- Pro: Built on open standards and open-source components, promoting transparency and flexibility.
- Pro: Includes an AI assistant (Alyx) to aid in debugging and accelerate development.
- Pro: Scalable for enterprise use with features like custom data limits, SOC2, and HIPAA compliance.
Weaknesses
- Con: The complexity of features might have a learning curve for new users.
- Con: Pricing for higher tiers is custom, which may require direct engagement with sales.
- Con: Specific limitations on trace spans and ingestion volume for free and lower-paid tiers.
Key features
Langfuse
Open Source LLM Engineering Platform for debugging and improving your LLM application.
Langfuse's pricing is quite generous, with a free Hobby tier offering 50k units per month, 30 days of data access and 2 users.
Watch out
Usage beyond included units at $8/100k units (graduated, lower with volume)
Strengths
- Pro: Open source LLM observability
- Pro: Self-hostable
- Pro: Good tracing
- Pro: Prompt management
- Pro: Active development
Weaknesses
- Con: Newer platform
- Con: Documentation improving
- Con: Cloud features limited
- Con: Smaller community
- Con: Enterprise features developing
Key features
Plans and prices: Arize AI vs Langfuse
| Tool | Plans and prices | Source |
|---|---|---|
| Arize AI |
| arize.com/pricing read Nov 9, 2026 |
| Langfuse |
| langfuse.com/pricing read Nov 9, 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 Arize AI pricing and Langfuse pricing.
Key Takeaways
Arize AI
- Worth considering for AI observability
Langfuse
- Worth considering for developer tools
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.
- Only Arize AI has a published user rating (4.3/5 from 48 reviews); Langfuse has none we can show.
- Entry prices are not ranked, they are charged on different bases: Arize AI $50/mo, billed monthly; Langfuse $29/mo flat, billed monthly.
- 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 Arize AI and Langfuse 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. Only Arize AI has a published user rating (4.3/5 from 48 reviews); Langfuse has none we can show. Entry prices are not ranked, they are charged on different bases: Arize AI $50/mo, billed monthly; Langfuse $29/mo flat, billed monthly. Both have a free plan.
What are Arize AI and Langfuse used for?
Arize AI: The AI & Agent Engineering Platform for LLM observability, evaluation, and development. Langfuse: Open Source LLM Engineering Platform for debugging and improving your LLM application.
What does Arize AI cost vs Langfuse?
Arize AI's cheapest paid plan is AX Pro at $50/mo, billed monthly; it also has a free plan. Langfuse's cheapest paid plan is Core at $29/mo flat, billed monthly; it also has a free plan. Prices read on the vendors' pricing pages, latest check Nov 9, 2026.
What's the main difference between Arize AI and Langfuse?
Arize AI's main strength: provides a comprehensive, unified platform for the entire AI lifecycle from development to production. Langfuse's main strength: open source LLM observability.
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