1. Magic (21st.dev)
Generate modern React UI components from natural language inside your editor.
Why: Generates modern React components from a description so there is something real to look at quickly.
Let your agent see and drive a browser
For frontend iteration and web testing: a real browser your agent controls, plus generated UI components.
You end up with: Your agent can build a component and then verify it against the live page.
2. Browserbase
Cloud browsers your agent can control for web interaction and data extraction.
Why: Cloud browser sessions let the agent open the page, click through the flow and read the result.
Setup instructions and compatibility are compiled from publisher docs and community reports, not hands-on testing, unless a step is marked Tested. Check the source before relying on a setup.