Langfuse
Observability & Evals · Free
Open-source LLM engineering platform for tracing and evals
At a glance
- Made by
- Langfuse
- Korean
- None (English and a few others only)
- API
- Yes
- Available on
- Web, CLI, API
- Open source
- MIT
- GitHub
- 35,799 stars · NOASSERTION
What is Langfuse?
Langfuse is an open-source AI engineering platform that helps teams debug, analyze, and improve AI agent applications together. It connects tracing, monitoring, datasets, experiments, and evaluation into one iterative loop. It records LLM calls, tool calls, and retrieval steps as hierarchical traces, and monitors cost, latency, and quality with dashboards and alerts. It can be self-hosted with Docker Compose, Kubernetes (Helm), and Terraform.
- Record LLM·tool·retrieval steps as hierarchical traces (observability)
- LLM-as-a-judge·heuristic·human review evaluation
- Prompt management (one-click deployment·rollback)
- Playground for testing prompts with real production inputs
- Dataset-based experiments and result comparison
- Human Annotation collaboration
- Cost·latency dashboards and automatic alerts
- REST API·CLI·MCP server
Who uses Langfuse and for what
- Tracing and evaluation of chat agents·coding agents·workflow automation
- Debugging failed and high-latency traces in production
- Optimizing spend through token cost·latency analysis
Pricing
What you get for free — Yes (Hobby: 50k units/month, 30 days of data, 2 users) / self-hosted open source
| Plan | Price | Main limits |
|---|---|---|
| Hobby | $0/mo | 50k units/month, 30-day data access, 2 users |
| Core | $29/mo | Includes 100k units/month, additional $8/100k units, 90-day data, unlimited users |
| Pro | $199/mo | Includes 100k units/month, additional $8/100k units, 3-year data, high request limits |
| Teams Add-on | $300/mo | Pro add-on options: enterprise SSO, fine-grained RBAC |
| Enterprise | $2,499/mo | Everything in Pro + Teams, audit logs, SCIM API, uptime SLA |
Checked on the official pages on 2026-10-14. Prices and features can change, so check the official site again before paying. · Official pricing page
AI tools similar to Langfuse (alternatives)
Langfuse vs. alternatives at a glance
| AI | Pricing | Combos on the map | Connected tools | Free | Cheapest monthly | Korean |
|---|---|---|---|---|---|---|
| Langfuse | Free | 0 | 5 | Yes | $29/mo | No |
| AgentOps | Free + paid | 0 | 5 | Yes | $40/mo | No |
| Helicone | Free | 0 | 5 | Yes | $79/mo | No |
| Opik | Free | 0 | 5 | Yes | $19/mo | No |
| Phoenix (Arize) | Free | 0 | 5 | Yes | $50/mo | No |
5 of these 5 tools have a free plan. Cheapest paid plan: Opik ($19/mo).
Combo and connection counts are based on the relationships recorded on AI Galaxy Map (2026-10-26); they are not a quality ranking.
Langfuse on AI Galaxy Map
- One of 27 AI tools in the Observability & Evals field.
- Connected to 5 other tools — #6 in its field.
Frequently asked questions
Can I use Langfuse for free?
Yes (Hobby: 50k units/month, 30 days of data, 2 users) / self-hosted open source. Prices can change, so check the official site before paying.
What AI can I use instead of Langfuse?
Tools that do the same job, such as AgentOps, Helicone, Opik, Phoenix (Arize), are connected to it on the map.
Can I use Langfuse in Korean?
None (English and a few others only)
Sources (official pages)
- https://github.com/langfuse/langfuse
- https://langfuse.com
- https://langfuse.com/docs
- https://langfuse.com/pricing
Checked on the official pages on 2026-10-14. Prices and features can change, so check the official site again before paying.