Annotate UI elements for AI agents - no code integration required
Users
351
−10 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
2
0 in 30 days
Store rank
#50K
#42K among extensions
Version
2.2.3
updated 22 Mar 2026
Users
monthly, 8 months
Latest, 15 Oct 2026:351 usersMove the mouse over the chart for any month
Ratings count
monthly, 8 months
Latest, 15 Oct 2026:2 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About onUI
onUI adds a lightweight visual annotation layer to Chrome so you can mark UI issues directly on live pages and generate structured context for AI-assisted fixes.
What you can do:
Annotate single or multiple elements on any webpage without modifying app code
Add intent and severity metadata to each annotation
Export reports in compact, standard, detailed, or forensic formats
Keep annotations tab-scoped with per-tab on/off control
Sync with a local MCP bridge (onui-local) for agent workflows in Claude Code/Codex
Clear on copy
Why onUI:
No backend required for core workflow
Local-first annotation + reporting
Built for iterative UI debugging and AI pair-programming loops
Notes:
Chrome stable support
Some pages (like chrome:// URLs) are restricted by browser policy
Local MCP setup is optional and requires separate local configuration
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