Langfuse pricing
How Langfuse charges, what to know before you commit, and what you'd pay at your usage — next to what the alternatives would cost for the same thing.
How it charges
Checked 2026-10-03 on langfuse.com ↗ · USD, list pricesFree for 50k units a month; Core is $29 and Pro $199 per month, each with 100k units, then $8 per 100k units, cheaper at volume.
- Free plan
- Yes
- Cheapest paid plan
- $29/mo
- Side project
- $0/mo Hobby
- Growing
- $29/mo Core
- Scaling
- $421/mo Core
What the model leaves out
Langfuse bills "units" — every trace, observation (span, event, generation) and score counts as one — so a trace with several steps uses several units; the model treats units as traces. Overage is graduated ($8 per 100k up to 1M, $7 to 10M, $6.50 to 50M, $6 above); the first tier is modeled. Hobby has 2 users and 30 days of data; Pro adds 3-year retention. Self-hosting the open-source version is free (hosting costs are yours).
- A unit is any trace, observation (span, event, generation) or score, so one multi-step trace counts as several units.
- Units created by Langfuse features such as LLM-as-a-Judge, annotation queues and experiments count toward billing too.
- Hobby keeps 30 days of data and allows 2 users.
- The plan fee is charged at the start of the month and usage at the end.
| Plan | Monthly fee | Traces per month |
|---|---|---|
| Hobby | Free | 50k traces includedup to 50k traces |
| Core | $29/mo | 100k traces includedthen $0.08 per 1,000 traces |
| Pro | $199/mo | 100k traces includedthen $0.08 per 1,000 traces |
What you'd pay
Core$29 plan$29/mo
Cost as you grow
All LLM observability & evals pricing, compared →Which one fits your situation →