How much does onUI cost?

onUI's pricing model is Open Source. Pricing not publicly listed.

What are the best alternatives to onUI?

onUI is a IDE Extensions AI agent. Compare it with the best alternatives — ranked by features, pricing, and use case — on our onUI alternatives page.

What skill level is required to use onUI?

onUI is designed for intermediate users.

onUI

Open source

IDE Extensions Updated Sep 16, 2026

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Compared with 6 other IDE Extensions agents Open source Self-hostable Updated Sep 2026

Open Source Updated Sep 2026 Self-hostable

Pricing

Open Source

Pricing not publicly listed.

Use cases

Annotating webpages to provide UI context for AI-assisted code generation Collaborative debugging by sharing UI annotations with team members Rapid prototyping by linking UI elements directly to code implementations Enhancing AI coding tools with visual context for more accurate suggestions

Pros & cons

Pros

Open-source and self-hostable for full control
Supports multiple popular AI coding tools
Annotation-first approach provides clear UI context

Cons

Requires setup of MCP server for full functionality
Limited to web-based UI contexts
Dependent on integration with other AI coding tools

Overview

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.

Problem it solves

It streamlines the process of integrating UI context into AI-assisted coding workflows, eliminating manual context switching between browsers and IDEs.

Target audience: Developers and teams working with ide extensions automation.

Inputs

User configuration
API credentials (if required)
Task parameters

Outputs

Automated task results
Status reports
Generated content or actions

Example workflow

1 User configures the agent with required parameters
2 Agent receives input data or trigger
3 Agent processes the request using its core logic
4 Agent interacts with external services if needed
5 Results are returned to the user

Sample system prompt


              You are onUI, an AI assistant. Help the user accomplish their task efficiently.

Tools & technologies

LLM APIs Python

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FAQs

What is 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.
How much does onUI cost?: onUI's pricing model is Open Source. Pricing not publicly listed.
What is onUI used for?: onUI is used for: Annotating webpages to provide UI context for AI-assisted code generation; Collaborative debugging by sharing UI annotations with team members; Rapid prototyping by linking UI elements directly to code implementations; Enhancing AI coding tools with visual context for more accurate suggestions.
What are the best alternatives to onUI?: onUI is a IDE Extensions AI agent. Compare it with the best alternatives — ranked by features, pricing, and use case — on our onUI alternatives page.
Is onUI open source?: Yes, onUI is open source.
Can onUI be self-hosted?: Yes, onUI can be self-hosted.
What skill level is required to use onUI?: onUI is designed for intermediate users.

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