Langfuse
Instrument your API calls, prompts, and evals or self-host the MIT-licensed repo; Langfuse captures traces, prompt versions, and evaluation metrics, offering cloud plans with unit quotas, retention windows, and overage rates. Teams can self-host or use Langfuse Cloud with documented free and paid monthly plan limits.
Langfuse Cloud offers four documented monthly plans: Hobby (Free), Core ($29 / month), Pro ($199 / month), and Enterprise ($2499 / month). Each plan lists included units, retention, throughput, and add-ons; per-unit overage is documented as $8/100k units for paid plans.Is Langfuse right for you?
Good for
- Developers and AI engineering teams who want an open-source observability and evaluation platform that can be self-hosted or run on Langfuse Cloud.
- Open-source MIT license enabling self-hosting and code inspection.
- Large integration surface to connect existing stacks and model providers.
Keep in mind
- Free Hobby plan limits historical data to 30 days.
- Hobby ingestion throughput and rate limits are low compared with paid tiers.
- Buyers who need unlimited historical retention on a low-cost starter plan; the free Hobby tier limits history to 30 days, so confirm retention needs before choosing a plan.
Pricing and plan limits
The pricing page lists monthly prices and detailed limits for Langfuse Cloud plans. The linked official pages do not list permanent self-hosted pricing for managed services; self-hosting technical options are documented but without matched costs.
More about capabilities and limits
Documented strengths
Open-source MIT license enabling self-hosting and code inspection.
Large integration surface to connect existing stacks and model providers.
Documented high scale capability for large event volumes.
Limitations to consider
Free Hobby plan limits historical data to 30 days.
Hobby ingestion throughput and rate limits are low compared with paid tiers.
Choosing a plan
Start on the Hobby cloud tier to validate instrumentation and retention needs, then compare unit usage and retention on Core/Pro plans to decide whether to self-host or upgrade.
Based on the linked product documentation.
Available on
Web.
Official sources
Alternatives to Langfuse
Choose around the work you need to do.