kitio.aiLangfuse vs Arize AI
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Langfuse has the lower starting price: about $29 a month, against $50 for Arize AI.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- LLM tracing
- OpenTelemetry support
- Prompt management
- Evaluations and datasets
- Self-hosting
- Arize Phoenix open source
- Agent tracing
- Online evaluations
- Drift monitoring
- Debugging copilot
| Feature | Langfuse | Arize AI |
|---|---|---|
| Best for | Open-source LLM observability, prompt management and evals | AI observability and evaluation, plus the open-source Phoenix |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $29/mo | $50/mo |
| Free plan | Yes | Yes |
| Made by | ClickHouse | Arize AI |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
Langfuse has the lower starting price: about $29 a month, against $50 for Arize AI.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Hobby
Free
- Free cloud plan
- Limited usage and history
Core
$29/mo
- 100k units included, $8/100k extra
- 90 days data access
- Unlimited users
Pro
$199/mo
- 3 years data access
- High rate limits
- SOC2 and ISO27001 reports
Enterprise
$2499/mo
- Audit logs and SCIM API
- Uptime and support SLA
- Named support engineer
3 plans
AX Free
Free
- 25k spans/month
- 1 GB ingestion/month
- 15 days retention
- Unlimited users
AX Pro
$50/mo
- 50k spans/month
- 10 GB ingestion/month
- 30 days retention
AX Enterprise
Contact sales
- Custom plans
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Langfuse
- Free to self-host
- No seat-based fees
- Works with any framework
- Self-hosting needs ops work
- Advanced features on paid tiers
- UI can feel dense
Arize AI
- Free open-source Phoenix
- Covers classic ML and LLMs
- Strong enterprise features
- AX costs rise with volume
- Two products can confuse
- Steeper setup than simple tools
Which one should you choose?
Choose Langfuse if you want:
- Free to self-host
- No seat-based fees
- Works with any framework
Watch out: self-hosting needs ops work.
Choose Arize AI if you want:
- Free open-source Phoenix
- Covers classic ML and LLMs
- Strong enterprise features
Watch out: ax costs rise with volume.
Langfuse vs Arize AI FAQ
What is the difference between Langfuse and Arize AI?
Langfuse: Open-source LLM observability, prompt management and evals. Arize AI: AI observability and evaluation, plus the open-source Phoenix. Both are models & apis tools.
Is Langfuse or Arize AI cheaper?
Langfuse has the lower starting price: about $29 a month, against $50 for Arize AI.
Do Langfuse and Arize AI have free plans?
Langfuse: Yes. Arize AI: Yes.
Who makes Langfuse?
Langfuse is made by ClickHouse, based in United States.
Who makes Arize AI?
Arize AI is made by Arize AI, based in United States.
Which should I choose, Langfuse or Arize AI?
Choose Langfuse if you value free to self-host and no seat-based fees. Choose Arize AI if you value free open-source phoenix and covers classic ml and llms.