Langfuse review

Langfuse ranks first because it pairs a full tracing, prompt and evaluation stack with the lowest paid entry price in this list among tools that include unlimited users. Its documentation describes it as an open-source AI engineering platform that is self-hostable, and the docs include setup guides for Docker Compose, Kubernetes with Helm and Terraform on the three big clouds. On Langfuse Cloud, the Hobby plan is free with 50k units a month and 30 days of data access for 2 users. Core costs $29 a month, includes 100k units and 90 days of data, and has no seat cap, which matters for teams where product managers and reviewers need access too. Pro at $199 adds 3 years of data access, unlimited annotation queues and SOC2 and ISO27001 reports. The trade-off is that enterprise identity features sit in a $300 a month Teams add-on, and heavy tracing volumes are billed at $8 per 100k units beyond the allowance.

Who it is for

engineering teams that want open-source tracing with a cheap cloud plan

Price

Free Hobby plan; Core from $29 a month with unlimited users; Pro $199 a month.

For production projects. Longer data access and unlimited users. $29 / month
Quoted from the vendor pricing page on November 12, 2026.

Key features

• Traces and agent graphs, session tracking for chats and threads, and user tracking
• Token and cost tracking across LLM calls
• Prompt management with version control and deployment
• Evaluations and annotation queues, unlimited on the Pro plan
• Self-hosting guides for Docker Compose, Kubernetes (Helm) and Terraform on AWS, GCP and Azure

Strengths and weaknesses

• Strength: Hobby plan is free with 50k units a month and no credit card
• Strength: Core at $29 a month already includes unlimited users and 100k units
• Strength: The open-source code can run in your own infrastructure
• Weakness: Hobby keeps only 30 days of data and allows 2 users
• Weakness: Enterprise SSO and fine-grained RBAC need the $300 a month Teams add-on on Pro
• Weakness: Usage beyond the included 100k units costs $8 per 100k units

Key facts

• Free plan: Hobby, 50k units a month, 30 days of data, 2 users
• Cheapest paid plan: Core, $29 a month, 100k units, 90 days of data
• Overage: $8 per 100k units, lower with volume
• Hosting: Langfuse Cloud or self-hosted

Where it ranks

Langfuse is No. 1 in our Best LLM Observability Tools verdict.