Compare
Langfuse vs ModelsLab
Short answer: Pick Langfuse if you want LLM observability & analytics; pick ModelsLab if you want unified API for 100K+ AI models. Langfuse has a free plan, paid from $29/month; ModelsLab starts at $21/month.
.png?width=96)
LangfuseOpen Source Observability & Analytics for LLM Apps 🕵️♂️
ModelsLabAI API Platform to access 100K+ AI modelsWhich to pick
Pick Langfuse if you want…
- LLM observability & analytics
- LLM app monitoring
- A free plan to start with (Hobby)
- Open-source code (langfuse/langfuse on GitHub)
- Integrations with TypeScript, Java or .NET (on Langfuse's list, not ModelsLab's)
Pick ModelsLab if you want…
- Unified API for 100K+ AI models
- The lower starting price: $21/month against $29/month
- Integrations with Node.js, REST or WebSocket (on ModelsLab's list, not Langfuse's)
Side by side
- What it is
- Langfuse:Langfuse is an open-source platform for tracing, evaluating and monitoring LLM applications and AI agents.
- ModelsLab:ModelsLab offers a unified API platform to access and run over 100K AI models across image, video, audio, 3D, and LLM tasks without managing GPU infrastructure.
- Best for
- Langfuse:LLM observability & analytics
- ModelsLab:Unified API for 100K+ AI models
- Who it’s for
- Langfuse:Developers building, debugging and scaling LLM-based apps and agents.
- ModelsLab:Developers and teams building AI features who want a single API for many models.
- Pricing
- Langfuse:Freemium
- ModelsLab:Paid
- Starting price
- Langfuse:$29/month (Core)
- ModelsLab:$21/month (Basic)
- Free plan or trial
- Langfuse:Free plan (Hobby)
- ModelsLab:No
- Plans
- Langfuse:Hobby Free · Core $29 per month · Pro $199 per month · Enterprise $2499 per month
- ModelsLab:Basic $21 per month · Standard $47 per month · Open Source Unlimited $149 per month
- Open source
- Langfuse:Yes, 35,097 GitHub stars
- ModelsLab:—
- Works with
- Langfuse:Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift
- ModelsLab:Python, Node.js, Go, PHP, REST, WebSocket
Langfuse features
- Hierarchical Traces. Capture every LLM call, tool invocation and retrieval step with filters for user, session, cost and latency.
- Prompt Management. Version, fetch, release and cache prompts separately from code with one-click deployments.
- Evaluation Engine. Run LLM-as-judge, heuristic or human-review evaluations on production data or experiments.
- Experiments & Datasets. Define test cases, run experiments and create golden datasets for continuous improvement.
- Dashboards & Alerts. Monitor cost, latency and quality via custom dashboards and automated alerts.
- Human Annotation. Collaborative human-in-the-loop workflows with annotation queues.
- Extensive Integrations. Supports Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift and 100+ agent frameworks and model providers.
- Self-hosted & Cloud Options. Available as hosted SaaS or self-hosted under MIT license.
ModelsLab features
- Single API Key for All Modalities. Access image, video, audio, 3D, and LLM endpoints with one key and wallet.
- Unlimited Open-Source Generations. Open-source models (Flux, SDXL, Qwen, WAN, etc.) generate without per-call charges on the $149/mo plan.
- Concurrent Request Limits. Plans provide 5, 10, or 15 parallel API requests to handle multiple generations.
- REST & WebSocket Support. Integrate via standard REST calls or real-time WebSocket streams.
- SDKs for Major Languages. Ready-to-use SDKs for Python, Node.js, Go, PHP and Postman collections.
- Enterprise SLA & Support. 99.9% uptime guarantee, dedicated manager, priority technical support.
Langfuse vs ModelsLab FAQ
What is the difference between Langfuse and ModelsLab?+
Langfuse: Observability for LLM apps, not an API marketplace.
Should I use Langfuse or ModelsLab?+
Pick Langfuse if you want LLM observability & analytics, LLM app monitoring or a free plan to start with (Hobby). Pick ModelsLab if you want unified API for 100K+ AI models, the lower starting price: $21/month against $29/month or integrations with Node.js, REST or WebSocket (on ModelsLab's list, not Langfuse's).
Is Langfuse or ModelsLab free?+
Langfuse has a free plan (Hobby); paid plans start at $29/month (Core). ModelsLab is paid, from $21/month (Basic).
Which is cheaper, Langfuse or ModelsLab?+
ModelsLab is cheaper to start with: ModelsLab's Basic plan ($21/month) against Langfuse's Core plan ($29/month).
Is Langfuse or ModelsLab open source?+
Langfuse is open source (langfuse/langfuse on GitHub). DevHunt has no public source repository on record for ModelsLab.
Do Langfuse and ModelsLab integrate with the same tools?+
Partly. Both list Python, Go and PHP. Langfuse also lists TypeScript, Java, .NET, Ruby and 7 more; ModelsLab also lists Node.js, REST and WebSocket.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.