kitio.aiLangfuse vs Ragas
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Ragas is completely free, while Langfuse is freemium.
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
- RAG quality metrics
- Agent evaluation
- Synthetic test generation
- Framework integrations
- CI-friendly runs
| Feature | Langfuse | Ragas |
|---|---|---|
| Best for | Open-source LLM observability, prompt management and evals | Open-source metrics and test data for evaluating RAG and agents |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Free |
| Starting price | $29/mo | Free |
| Free plan | Yes | Yes, fully free |
| Made by | ClickHouse | Vibrant Labs |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Ragas is completely free, while Langfuse is freemium.
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
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
Ragas
- Free and widely used
- Research-backed metrics
- Generates test data
- LLM-judge metrics cost tokens
- API changes between versions
- No hosted dashboard included
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 Ragas if you want:
- Free and widely used
- Research-backed metrics
- Generates test data
Watch out: llm-judge metrics cost tokens.
Langfuse vs Ragas FAQ
What is the difference between Langfuse and Ragas?
Langfuse: Open-source LLM observability, prompt management and evals. Ragas: Open-source metrics and test data for evaluating RAG and agents. Both are models & apis tools.
Is Langfuse or Ragas cheaper?
Ragas is completely free, while Langfuse is freemium.
Do Langfuse and Ragas have free plans?
Langfuse: Yes. Ragas: Yes, fully free.
Who makes Langfuse?
Langfuse is made by ClickHouse, based in United States.
Who makes Ragas?
Ragas is made by Vibrant Labs.
Which should I choose, Langfuse or Ragas?
Choose Langfuse if you value free to self-host and no seat-based fees. Choose Ragas if you value free and widely used and research-backed metrics.