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Langfuse vs Scribbler
Short answer: Pick Langfuse if you want LLM observability & analytics; pick Scribbler if you want client-side AI notebooks. Langfuse has a free plan, paid from $29/month; Scribbler is free.
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LangfuseOpen Source Observability & Analytics for LLM Apps 🕵️♂️
ScribblerUnleash JavaScript's Power: Experiment with Ease Using Notebooks!Which to pick
Pick Langfuse if you want…
- LLM observability & analytics
- Integrations with Python, TypeScript or Go (on Langfuse's list, not Scribbler's)
Pick Scribbler if you want…
- Client-side AI notebooks
- A free, open-source tool
- Integrations with TensorFlow.js, ONNX Runtime Web or Transformers.js (on Scribbler'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.
- Scribbler:Scribbler is an in-browser, no-backend notebook for running JavaScript AI, data science, and visualization.
- Best for
- Langfuse:LLM observability & analytics
- Scribbler:Client-side AI notebooks
- Who it’s for
- Langfuse:Developers building, debugging and scaling LLM-based apps and agents.
- Scribbler:Developers and data scientists who want client-side AI without servers.
- Pricing
- Langfuse:Freemium
- Scribbler:Free
- Starting price
- Langfuse:$29/month (Core)
- Scribbler:Free
- Free plan or trial
- Langfuse:Free plan (Hobby)
- Scribbler:Free to use
- Plans
- Langfuse:Hobby Free · Core $29 per month · Pro $199 per month · Enterprise $2499 per month
- Scribbler:—
- Open source
- Langfuse:Yes, 35,097 GitHub stars
- Scribbler:Yes, 378 GitHub stars
- Works with
- Langfuse:Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift
- Scribbler:TensorFlow.js, ONNX Runtime Web, Transformers.js, Plotly, D3, WebLLM, WebGPU
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.
Scribbler features
- Zero-setup. Runs entirely in the browser; no install, login, or backend required.
- WebGPU acceleration. Uses WebGPU for near-native performance on LLMs, image generation and ML inference.
- Dynamic library loading. Import TensorFlow.js, ONNX Runtime, Transformers.js, Plotly, D3 and more from CDNs on demand.
- Interactive notebooks. Mix JavaScript, HTML, CSS and Markdown in live cells with inline output.
- Privacy-first. All computation stays on the device; no data leaves the browser.
- Share & collaborate. Export notebooks as .jsnb files, share via URL, or push/pull directly to GitHub.
- Self-hostable. Pure static files can be hosted on any web server, S3 bucket or GitHub Pages.
- Built-in AI models. Run Stable Diffusion, LLM chat, and TTS via WebNN and ONNX Runtime in the browser.
Langfuse vs Scribbler FAQ
What is the difference between Langfuse and Scribbler?+
Langfuse focuses on observability for LLM apps, not on in-browser notebooks.
Should I use Langfuse or Scribbler?+
Pick Langfuse if you want LLM observability & analytics or integrations with Python, TypeScript or Go (on Langfuse's list, not Scribbler's). Pick Scribbler if you want client-side AI notebooks, a free, open-source tool or integrations with TensorFlow.js, ONNX Runtime Web or Transformers.js (on Scribbler's list, not Langfuse's).
Is Langfuse or Scribbler free?+
Langfuse has a free plan (Hobby); paid plans start at $29/month (Core). Scribbler is free.
Which is cheaper, Langfuse or Scribbler?+
Scribbler is free, so it costs less. Langfuse starts at $29/month (Core).
Is Langfuse or Scribbler open source?+
Yes, both are open source: Langfuse (langfuse/langfuse on GitHub) and Scribbler (gopi-suvanam/scribbler on GitHub, MIT license).
Do Langfuse and Scribbler integrate with the same tools?+
Their integration lists don't overlap: Langfuse lists Python, TypeScript, Go, Java and 10 more; Scribbler lists TensorFlow.js, ONNX Runtime Web, Transformers.js, Plotly and 3 more.
On DevHunt
Scribbler
13 upvotes · Launched on DevHunt on Jan 31, 2023
Based on each tool's website and DevHunt data. Details may change; check the official sites.