Langfuse vs Fulcra
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 Fulcra
| Detail | Langfuse | Fulcra |
|---|
| What it does | Open Source Agent Evals & Observability
| The user-owned context backend for AI agents
|
|---|
| Stage | Established
| Growing
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| Founded | Not given
| Not given
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| Based in | DE
| US
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| Pricing model | freemium
| freemium
|
|---|
| 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
| - One user-owned context for every agent
- Agents wake up to what changed since their last loop
- Readable, traceable context with every change logged
- End-to-end encryption with AES-256
- Granular sharing controls with revocable access
- Right to export, delete, and transparency
- Context that travels across AI products and models
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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
| - User-owned context that travels with you across AI products
- Traceable agent activity with full visibility and control
- Agents coordinate through shared context without learning being trapped in silos
- End-to-end encryption with no data selling
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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 | 26 ● no change since last check |
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| Trust Flow (Majestic) | 35 | 20 |
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| Citation Flow (Majestic) | 54 | 40 |
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| Referring domains (Majestic) | 6114 | 593 |
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6 details filled in for both companies.
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