# langfuse

> 🪢 Open source LLM engineering platform: LLM Observability, metrics, evals, prompt management, playground, datasets. Integrates with OpenTelemetry, Langchain, OpenAI SDK, LiteLLM, and more. 🍊YC W23 

- **URL**: https://www.freshcrate.ai/projects/langfuse
- **Author**: langfuse
- **Category**: Prompt Engineering
- **Latest version**: `v3.178.0` (2026-06-02)
- **License**: NOASSERTION
- **Source**: https://github.com/langfuse/langfuse
- **Homepage**: https://langfuse.com/docs
- **Language**: TypeScript
- **GitHub**: 25,291 stars, 2,568 forks
- **Registry**: github
- **Tags**: `analytics`, `autogen`, `evaluation`, `langchain`, `large-language-models`, `llama-index`, `llm`, `llm-evaluation`, `prompt-engineering`, `typescript`

## Description

🪢 Open source LLM engineering platform: LLM Observability, metrics, evals, prompt management, playground, datasets. Integrates with OpenTelemetry, Langchain, OpenAI SDK, LiteLLM, and more. 🍊YC W23

## Recent releases

| Version | Date | Urgency | Changes |
| --- | --- | --- | --- |
| `v3.178.0` | 2026-06-02 | High | ## What's Changed  ### Features * feat(agent): Connect in-app agent to langfuse MCP by @bezbac in https://github.com/langfuse/langfuse/pull/13747 * feat(web): derive code eval support from dispatcher by @wochinge in https://github.com/langfuse/langfuse/pull/13979 * feat(mcp): Add optional id to upsertDataset by @bezbac in https://github.com/langfuse/langfuse/pull/13946  ### Fixes / Improvements * fix(security): enforce auditLogs:read and audit-logs entitlement for audit_logs batch export |
| `v3.176.0` | 2026-05-28 | High | ## What's Changed ### Features  * feat(auth): In-app agent API keys * feat(dashboards): import/export widget configs * feat(agent): Update bedrock auth strategy * feat(automations): narrow getAutomations by event source and event * feat(mcp): Make metrics available via MCP * feat(mcp): Make scores available via MCP * feat: initial FTS implementation * feat(email): support AWS SES transport via default credential chain * feat(mcp): add health, comments, datasets, annotationqueues model |
| `v3.175.0` | 2026-05-21 | High | ## What's Changed  ### Features * feat(widgets): add observation type filter by @marksalpeter in https://github.com/langfuse/langfuse/pull/13639 * feat(observations-v2): expose trace_context field group in public API by @niklassemmler in https://github.com/langfuse/langfuse/pull/13620 * feat(onboarding): remove invite team members from org creation flow by @annabellscha in https://github.com/langfuse/langfuse/pull/13640 * feat(blob-export): gate legacy export sources for post-cutoff Cloud |
| `v3.174.1` | 2026-05-13 | High | ## What's Changed  ### Chores * chore: add CODEOWNERS for GitHub config by @wochinge in https://github.com/langfuse/langfuse/pull/13616 * chore(deps): bump otel to 0.218.0 by @nimarb in https://github.com/langfuse/langfuse/pull/13624 * chore(deps): bump langsmith to 0.6.0 by @nimarb in https://github.com/langfuse/langfuse/pull/13625   **Full Changelog**: https://github.com/langfuse/langfuse/compare/v3.174.0...v3.174.1 |
| `v3.173.0` | 2026-05-08 | High | ## What's Changed  ### Features * feat(experiments): show metadata in overview by @wochinge in https://github.com/langfuse/langfuse/pull/13456 * feat(worker): add secondary otel ingestion queue by @Steffen911 in https://github.com/langfuse/langfuse/pull/13490 * feat(sso): self-service SSO config with DNS-verified domains by @marksalpeter in https://github.com/langfuse/langfuse/pull/13507  ### Fixes / Improvements * fix(evals): do not drop langfuseObject on config on template upgrades by |
| `v3.172.1` | 2026-05-01 | High | ## What's Changed  ### Fixes * fix(traces): refresh scores in trace detail by @wochinge in https://github.com/langfuse/langfuse/pull/13427  ### Chores * chore(eslint): Disallow use of `overflow-scroll` classes by @bezbac in https://github.com/langfuse/langfuse/pull/13403 * chore(ci): disable test sharding + speed up test suite by @wochinge in https://github.com/langfuse/langfuse/pull/13383 * test: deflake DNS-dependent CI tests by @wochinge in https://github.com/langfuse/langfuse/pull/13 |
| `v3.172.0` | 2026-04-29 | High | ## What's Changed  ### Features * feat(traces): Add none filter mode for tags in the sidebar by @bezbac in https://github.com/langfuse/langfuse/pull/13339  ### Fixes / Improvements * fix(server): ingest flattened experiment metadata by @hassiebp in https://github.com/langfuse/langfuse/pull/13368 * perf(clickhouse): emit has(metadata_names) conjunct for events filters by @sumerman in https://github.com/langfuse/langfuse/pull/13369 * fix(internal-tracing): remove output parser spans by @ha |
| `v3.170.0` | 2026-04-23 | High | ## What's Changed  ### Features  * feat(web): warn about unencoded special characters in DATABASE_URL on migration failure by @Steffen911 in https://github.com/langfuse/langfuse/pull/13186 * feat: emit .rate and .time metrics with shard tags for DataDog aggregation by @sumerman in https://github.com/langfuse/langfuse/pull/13249 * feat(auth): allow configuration of ID Token signed response alg by @ICZAD769 in https://github.com/langfuse/langfuse/pull/12333 * feat: detect SDK version from l |
| `v3.169.0` | 2026-04-17 | High | ## What's Changed  ### Features * feat: QueueMetricsRunner collects queue metrics on a fixed schedule and aggegates sharded queue metrics by @sumerman in https://github.com/langfuse/langfuse/pull/13231  ### Fixes / Improvments * fix: update managed ragas-faithfulness-evaluator with proper scoring and prompt details by @marliessophie in https://github.com/langfuse/langfuse/pull/13226 * fix(ci): use exact release tags in action version comments by @wochinge in https://github.com/langfuse/la |
| `v3.168.0` | 2026-04-17 | High | ## What's Changed  ### Features * feat(web): add support for AWS Bedrock API Keys (Bearer Tokens) by @wochinge in https://github.com/langfuse/langfuse/pull/13098 * feat(experiments): direct-write prompt experiment root events by @hassiebp in https://github.com/langfuse/langfuse/pull/13044 * feat: add OCI Object Storage Native SDK integration with IAM auth options by @sanjeev260191 in https://github.com/langfuse/langfuse/pull/12379 * feat(ui): remove tier from pylon issue field and change w |

## Citation

- HTML: https://www.freshcrate.ai/projects/langfuse
- Markdown: https://www.freshcrate.ai/projects/langfuse.md
- Dependencies JSON: https://www.freshcrate.ai/api/projects/langfuse/deps

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