Langfuse
8.1#1 in ai agent observability toolsFrom $29 a monthFree planWebAPILinuxSelf-hosted
VisitLangfuse vs PromptLens
PromptLens
6.7#10 in ai prompt management softwareFrom $99 a monthFree planWeb
VisitWhat both publish
| Fact | Langfuse | PromptLens |
|---|---|---|
| Observability | Hierarchical traces capture LLM calls, tool invocations, and retrieval steps, with filtering by user, session, cost, latency, and metadata. | The site says its observability product traces production model calls, tools, and retrieval, including timing, errors, usage, and cost. |
| Prompt management | Prompt Management provides versioning, one-click deployments, rollbacks, prompt labels, and per-version performance metrics. | PromptLens lets users version prompts and publish the version their application needs through a retrieval API. |
| Security | Langfuse reports annual SOC 2 Type II and ISO 27001 audits, external penetration tests, encryption, access controls, GDPR compliance, and a HIPAA-ready region. | The privacy policy says sensitive data is encrypted at rest, data is transmitted over HTTPS, and access to user data is restricted to authorized personnel. |
Langfuse plans
- HobbyFree
- HobbyFree
- Core$29 a month
- Core$29 a month
- Pro$199 a month
- Pro$199 a month
PromptLens plans
- FreeFree
- Pro$99 a month
- TeamsPriced on request
Pick Langfuse if…
Langfuse suits teams building AI agent applications that need tracing, prompt management, and evaluation tools. It also supports teams that want to self-host the core on their own infrastructure.
Pick PromptLens if…
PromptLens suits teams shipping production LLM workflows that need prompt versioning, evaluation, or observability. It may also fit teams that want to share reports with people who do not have an account or paid seat.