Arize Phoenix
coding
Open-source LLM and agent observability built on OpenTelemetry.
Pricing
Free plan
Rating
—
Votes
0
Head-to-head comparison
Arize Phoenix vs Langfuse
Compare Arize Phoenix and Langfuse side by side across pricing, features, ratings, pros, cons, best-fit use cases, and alternatives.
Langfuse
coding
Open-source LLM observability and evaluation
Pricing
Free plan
Rating
—
Votes
0
Feature comparison
Feature
Arize Phoenix
Langfuse
Category
coding
coding
Pricing
Free plan
Free plan
Free plan
API access
Mobile app
Browser extension
Team collaboration
Custom training
Self-hosted option
Offline mode
Multi-language support
Arize Phoenix pros and cons
Free and source-available, self-hosts in one command
Built on open OpenTelemetry standards
Strong tracing and evaluation for agents and RAG
Works locally, good for private/dev-time debugging
Production-scale features require paid Arize AX
Self-hosting means you run the infrastructure
Dynatrace acquisition may change roadmap/governance
Langfuse pros and cons
Open source with nearly all features MIT-licensed
Self-host the full product free, no seat or usage caps
Framework-agnostic (works with or without LangChain)
Strong tracing, prompt management, and evaluation
Self-hosting still requires running infrastructure
Enterprise compliance features are commercial
Cloud Pro tier jumps significantly in price
Which one should you choose?
Best overall signal
Arize Phoenix
Selected using Toolglade popularity signals such as views and votes.
Best value signal
Arize Phoenix
Selected using free-plan availability and engagement signals.
Best for
Arize Phoenix
- LLM and agent tracing
- RAG debugging
- eval-driven development
- hallucination detection
- Engineers debugging LLM and agent apps
Langfuse
- LLM tracing
- Prompt management
- Evaluations
- Self-hosted observability
- Teams wanting open-source LLM observability
FAQ
Is Arize Phoenix better than Langfuse?
It depends on your use case. Compare category fit, pricing, feature availability, and ratings before choosing.
Which tool has a free plan?
Arize Phoenix and Langfuse offer a free plan based on current Toolglade data.
Where can I find alternatives?
View Arize Phoenix alternatives or view Langfuse alternatives.