Gradio vs Vellum
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Gradio is an open source Python package for building web interfaces for ML models, APIs, or any Python function, letting you launch an app locally, generate share links with share=True, and deploy on your own server or on hosting like Hugging Face Spaces.
Vellum is an AI agent building platform that combines a prompt playground, evaluation tools, and hosted agent apps so teams can iterate on LLM workflows with debugging and knowledge base support, starting with a free tier and upgrading for more credits.
Feature Tags Comparison
Key Features
- Interface builder: Wrap a Python function with inputs and outputs to create a working web demo that is easy to share and reuse
- Blocks framework: Use Blocks for flexible layouts and multi step flows when Interface does not cover your interaction needs
- Launch server: launch() starts a local web server for your app so you can test and iterate without extra infrastructure setup
- Public share links: Set share=True in launch() to create a public link anyone can open in a browser for quick reviews and demos
- Hosting paths: Guides cover deploying on Hugging Face Spaces or your own server and embedding hosted spaces inside websites
- FastAPI mounting: The sharing guide includes mounting within FastAPI so apps can live inside an existing Python API service
- Free and Pro plans: Pricing starts at $0 with 50 credits and Pro at $25 with 200 builder credits so solo builders can scale testing
- Prompt playground: Compare models side by side and iterate prompts systematically instead of relying on subjective testing
- Evaluations framework: Run repeatable quality tests at scale to detect regressions and track improvements across prompt versions
- Hosted agent apps: Share working agents with teammates through hosted apps for demos
- reviews
- and stakeholder feedback cycles
Use Cases
- Model demo: Build a quick browser UI for a text classifier or image model so teammates can test behavior without notebooks
- API wrapper: Put a web front end on top of an existing inference API so users can send inputs and view outputs interactively
- Shareable prototype: Launch with share=True to generate a public link for stakeholder review during early product discovery
- Internal tools: Create a small dashboard for analysts to run a Python workflow on demand and export results for reporting
- Website embed: Host on Hugging Face Spaces then embed the app into documentation or a landing page for guided trials and feedback
- FastAPI app: Mount a Gradio UI inside FastAPI so the same service provides both a web interface and a programmatic API endpoint
- Agent prototyping: Build an agent by chatting with AI then refine logic with low code steps and controlled prompt versions
- Prompt iteration: Compare LLM outputs side by side and select prompts that improve accuracy and reduce unwanted variation
- Regression testing: Run evaluations on a saved dataset before release to catch quality drops after model or prompt changes
- RAG apps: Attach a knowledge base and test retrieval behavior with representative questions and strict document scope rules
- Stakeholder demos: Publish hosted agent apps so product and compliance reviewers can test behavior without local setup steps
- Model selection: Evaluate providers and self hosted options with the same tasks to choose the best cost and latency mix for production
Perfect For
ML engineers, data scientists, research teams, product engineers, MLOps practitioners, founders validating prototypes, educators teaching ML, developers exposing Python workflows to non coders
product managers, ML engineers, software engineers, data scientists, AI platform teams, prompt engineers, QA and reliability teams, startups building LLM features, teams shipping agent workflows
Capabilities
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