kitio.aiLangfuse vs Arthur
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 $60 for Arthur.
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
- Agent discovery
- Step-level tracing
- Runtime guardrails
- Audit logs and lineage
- Custom metrics and alerts
| Feature | Langfuse | Arthur |
|---|---|---|
| Best for | Open-source LLM observability, prompt management and evals | Discovery, monitoring and governance for enterprise AI agents |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $29/mo | $60/mo |
| Free plan | Yes | Yes |
| Made by | ClickHouse | Arthur AI |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Langfuse has the lower starting price: about $29 a month, against $60 for Arthur.
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
Free
Free
- Up to 4 monitored use cases
- Unlimited seats
- Cloud data connectors
Premium
$60/mo
- Up to 100 use cases
- Custom metrics and dashboards
- Custom alerts and webhooks
Enterprise
Contact sales
- Dedicated infrastructure
- Governance and support
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
Arthur
- Finds shadow agents across environments
- Free tier with unlimited seats
- Covers security and evaluation together
- Free tier monitors only 4 use cases
- Enterprise features need a sales call
- Broad platform takes time to set up
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 Arthur if you want:
- Finds shadow agents across environments
- Free tier with unlimited seats
- Covers security and evaluation together
Watch out: free tier monitors only 4 use cases.
Langfuse vs Arthur FAQ
What is the difference between Langfuse and Arthur?
Langfuse: Open-source LLM observability, prompt management and evals. Arthur: Discovery, monitoring and governance for enterprise AI agents. Both are models & apis tools.
Is Langfuse or Arthur cheaper?
Langfuse has the lower starting price: about $29 a month, against $60 for Arthur.
Do Langfuse and Arthur have free plans?
Langfuse: Yes. Arthur: Yes.
Who makes Langfuse?
Langfuse is made by ClickHouse, based in United States.
Who makes Arthur?
Arthur is made by Arthur AI, based in United States.
Which should I choose, Langfuse or Arthur?
Choose Langfuse if you value free to self-host and no seat-based fees. Choose Arthur if you value finds shadow agents across environments and free tier with unlimited seats.