onUI vs Ptah
A side-by-side comparison of two IDE Extensions AI agents - to help you pick the right one.
onUI
onUI is an open-source browser extension and MCP server that enables annotation-first UI pair programming with AI agents. It allows users to annotate webpages and bridge UI context to AI coding tools like Claude Code, Cursor, Windsurf, or Copilot, facilitating collaborative development.
Ptah
Ptah is a multi-provider AI coding orchestra for VS Code that connects to various models from one interface. It features CLI agent orchestration, a built-in MCP server, plugin ecosystem, and workspace intelligence. Ptah supports models like OpenRouter, Kimi, GLM, Copilot, Gemini, and Codex.
Feature comparison
| onUI | Ptah | |
|---|---|---|
| Category | IDE Extensions | IDE Extensions |
| Open source | ||
| Self-hostable | Not publicly specified | |
| Skill level | Intermediate | Intermediate |
| Pricing | Open Source | Open Source |
onUI: what it solves
It streamlines the process of integrating UI context into AI-assisted coding workflows, eliminating manual context switching between browsers and IDEs.
Ptah: what it solves
Streamlining AI model integration for coding in VS Code