| What it does | Open Source Agent Evals & Observability
| Your voice and skills in every AI tool you use
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| Stage | Established
| Startup
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| Founded | Not given
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| Based in | DE
| US
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| Pricing model | Freemium
| Freemium
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| Pricing | Not given
| Free: 1 Profile, 10 Skills, 50 Documents, 10 Artifacts, 1 Style Guide from Starter Pack, 100 Hosted Chat AI credits/month. Pro: $24/mo or $20/mo billed annually, 5 Profiles, 75 Skills, 500 Documents, 75 Artifacts, 1 Style Guide, 1,000 Hosted Chat AI credits/month. Max: $49/mo or $40/mo billed annual
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| Key features | - Hierarchical traces capture every LLM call, tool invocation, and retrieval step
- LLM-as-a-judge, heuristic functions, or human review evaluations
- Prompt management with one-click deployments and rollbacks
- Playground to test prompts on real production inputs and compare models
- Experiments with test cases and side-by-side comparison
- Human annotation and collaborative human-in-the-loop workflows
- Cost and latency monitoring with dashboards and alerts
- REST APIs and Query SDK for data access
- Langfuse Assistant to automate the AI engineering loop
| - Profiles to define voice, tone, and judgment
- Style Guides to enforce writing rules
- Knowledgebases to store trusted documents and notes
- Skills to package repeatable workflows
- Artifacts for versioned, shareable outputs
- Hosted Chat with custom runtime
- MCP integration with external tools
- Team workspaces with shared knowledge
- Skill Catalog for discovery and import
- Collections to group and present artifacts
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| What makes it different | - MIT licensed open source platform with no data lock-in
- Enterprise scale architecture handling billions of monthly events
- Works with any language and framework with no framework lock-in
- Async by default so tracing never blocks your application
| - Output sounds like you, not generic AI, because every tool reads the same profiles and style guides
- Stop re-uploading docs and rewriting instructions for each new tool
- Individual voice, shared standards on teams
- Built-in changelogs instead of Git for managing skills
- Works with any MCP-compatible AI client without vendor lock-in
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 80 ▲ +1 (up) since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 35 | 4 |
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| Citation Flow (Majestic) | 54 | 25 |
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| Referring domains (Majestic) | 6114 | 27 |
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