Langfuse vs Comet
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Langfuse compared with Comet
| Detail | Langfuse | Comet |
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| What it does | Open Source Agent Evals & Observability
| The AI Developer Platform
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| Stage | Established
| Not given
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| Founded | Not given
| 2017
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| Based in | DE
| US
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| Pricing model | freemium
| Not given
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| Pricing | Not given
| Not given
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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
| - LLM trace logging with 40+ integrations
- Automatic error detection and diagnostics
- Ollie agent for code fix recommendations
- Test Suites and 40+ LLM-as-a-judge evaluation metrics
- Production dashboards and alerts for agents
- Prompt playground and optimization
- Agent Playground for local agent development
- Cost intelligence for Claude Code and Codex tracking
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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
| - Truly open-source platform with enterprise-grade infrastructure
- Traces appear almost instantly even at high volumes
- Flexible hosting options including self-hosted, cloud, and custom deployments
- Easy integration with just a few lines of code
- Opik automatically turns trace data and eval results into code fixes
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| Free plan | Not given
| Not given
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| Open source | Not given
| Not given
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| Platforms | Not given
| Not given
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| Public API | Not given
| Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 79 ● no change since last check | 73 ● no change since last check |
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| Trust Flow (Majestic) | 35 | 28 |
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| Citation Flow (Majestic) | 54 | 51 |
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| Referring domains (Majestic) | 6114 | 4448 |
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4 details filled in for both companies.
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