kitio.aiLangfuse vs Promptfoo
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Langfuse starts at $29/mo and Promptfoo starts at See pricing page. Check both pricing pages for current plans.
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
- Config-based test cases
- Model comparison
- Red-team scans
- CI integration
- Web results viewer
| Feature | Langfuse | Promptfoo |
|---|---|---|
| Best for | Open-source LLM observability, prompt management and evals | Open-source CLI for testing prompts and red-teaming AI apps |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $29/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | ClickHouse | OpenAI |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Langfuse starts at $29/mo and Promptfoo starts at See pricing page. Check both pricing pages for current plans.
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
2 plans
Community
Free
- Open source
- All LLM evaluation features
- Red teaming (10k probes/month)
- Run locally or self-host
Enterprise
Contact sales
- Reports and continuous monitoring
- Issue tracking and remediation
- Dedicated runner
- Assigned deployment 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
Promptfoo
- Free and works with any provider
- Strong security testing
- Fits developer workflows
- Owned by a model vendor now
- CLI-first may not suit everyone
- Enterprise pricing not public
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 Promptfoo if you want:
- Free and works with any provider
- Strong security testing
- Fits developer workflows
Watch out: owned by a model vendor now.
Langfuse vs Promptfoo FAQ
What is the difference between Langfuse and Promptfoo?
Langfuse: Open-source LLM observability, prompt management and evals. Promptfoo: Open-source CLI for testing prompts and red-teaming AI apps. Both are models & apis tools.
Is Langfuse or Promptfoo cheaper?
Langfuse starts at $29/mo and Promptfoo starts at See pricing page. Check both pricing pages for current plans.
Do Langfuse and Promptfoo have free plans?
Langfuse: Yes. Promptfoo: Yes.
Who makes Langfuse?
Langfuse is made by ClickHouse, based in United States.
Who makes Promptfoo?
Promptfoo is made by OpenAI, based in United States.
Which should I choose, Langfuse or Promptfoo?
Choose Langfuse if you value free to self-host and no seat-based fees. Choose Promptfoo if you value free and works with any provider and strong security testing.