Langfuse
langfuse.com
Open-source observability and analytics platform for LLM applications.
Quick Information
- Category:
- Coding
- Pricing:
- Freemium
- Platforms:
- Web
- Free Plan:
- Yes
- API Available:
- Yes
- Last Verified:
- September 2026
What Is Langfuse?
Langfuse is an open-source observability and analytics platform for LLM applications, acquired by ClickHouse on January 16, 2026 alongside ClickHouse's own $400M Series D funding round at a $15B valuation. Pricing runs Hobby (free, all platform features with limits, 50k units/month, 30-day data access, 2 users), Core at $29/month, Pro at $199/month, and Enterprise at $2,499/month, with overage on paid plans costing $8 per 100k additional units (a billable unit being traces + observations + scores combined).
Self-hosting remains genuinely free and unlimited under the MIT license — a real alternative to any paid Langfuse Cloud tier for teams wanting full control over their observability infrastructure, with a paid self-hosted Enterprise option available specifically for SSO, RBAC, and audit logs if those enterprise features are needed on top of self-hosted infrastructure.
It's aimed at teams building LLM applications who need tracing, evaluation, and monitoring, with the ClickHouse acquisition being a significant recent ownership change worth knowing about even though pricing and the open-source self-hosting option have remained stable through 2026. See our Developer Tools directory for related tools like LangSmith.
What Can You Use Langfuse For?
LLM application tracing
Traces LLM application calls for debugging and monitoring.
LLM evaluation
Evaluates LLM application outputs for quality and correctness.
Self-hosted observability
Runs observability infrastructure fully self-hosted under an MIT license.
Langfuse Features
- Tracing — Traces LLM application calls including traces, observations, and scores.
- Self-hosting — Provides genuinely free and unlimited self-hosting under the MIT license.
- Usage-based overage — Charges $8 per 100k additional units beyond a plan’s included allocation.
Who Is Langfuse For?
- LLM application developers — Traces, evaluates, and monitors LLM application behavior in production.
- Self-hosting teams — Runs Langfuse infrastructure fully in-house under the free, unlimited MIT license.
Langfuse Pros & Limitations
What We Like
- Genuinely free and unlimited self-hosting option under an open MIT license
- Hobby tier’s 50k units/month is a generous free allocation for smaller projects
- Backed by ClickHouse following its January 2026 acquisition and $400M Series D
Limitations
- Paid Cloud tiers scale meaningfully (Core $29 to Enterprise $2,499/month) based on usage volume
- Overage billing ($8 per 100k units) requires monitoring usage to avoid unexpected costs
- Recent acquisition by ClickHouse introduces some uncertainty around long-term product direction
Langfuse Pricing
| Plan | Price | Main Features |
|---|---|---|
| Hobby | Free | 50k units/month, 30-day data access, 2 users |
| Core | $29/month | Expanded units and features |
| Pro | $199/month | Higher usage allocation |
| Enterprise | $2,499/month | Full enterprise feature set |
Pricing was last verified September 2026. Check the official website for the latest pricing.
AI Listing Jungle Ranking
- Global Rank:
- #516
- Overall Score:
- 37.9/100
- Monthly Users:
- –
- Rank Change:
- ▲ 29
This ranking reflects AI Listing Jungle's own independent scoring methodology and is not an endorsement by Langfuse or its company. How Our Rankings Work
Frequently Asked Questions
Is Langfuse free?
Yes, the Hobby tier is free (50k units/month), and self-hosting is free and unlimited under the MIT license.
Who owns Langfuse now?
ClickHouse, which acquired Langfuse on January 16, 2026.
How much does Langfuse Pro cost?
$199/month, with Enterprise at $2,499/month for the full feature set.
What counts as a billable unit?
Traces, observations, and scores combined.
Our Take
Langfuse's genuinely free, unlimited self-hosting option under MIT remains a strong alternative to paid Cloud tiers for teams comfortable managing their own infrastructure.
The January 2026 ClickHouse acquisition is a significant ownership change worth tracking, even though pricing has stayed stable through the transition.
Langfuse Alternatives
Langfuse Comparisons
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