User presses Alt+P or clicks the extension icon to activate. A ruler overlay appears on the page. User can draw a rectangle to measure arbitrary areas (free selection mode) or toggle element mode to hover over and click HTML elements to see their dimensions. The toolbar displays width, height, left, right, top, bottom measurements in pixels. Users can dock the toolbar, show guides, and search element borders.

Target users: Web developers / Web designers / UI/UX designers / Front-end engineers

Source code is heavily minified (content.js is 256KB minified bundle) making deeper code analysis difficult but not needed for the three decisions
The extension appears to be based on 'Page Ruler Redux' open source project (referenced in CSS comments)

Monetization

No paid features detected

No paid features, subscription flows, payment APIs, upgrade prompts, or feature gating found. The 'pro' keyword matches are false positives from minified bundle code. The 'license' matches reference the CSS software license URI, not a paid license. Store description explicitly states 'Free & Efficient!'. No Stripe, PayPal, or other payment platform integrations detected.

Confidence: 95
Payment platform: --
Source: AI / High
Login required: No
Reason: The extension operates entirely locally using Chrome APIs (storage, alarms, scripting). No login UI, authentication flows, account creation, or session management code was found. The keyword hits for 'auth' are false positives from CSS author comments ('Author: Esteban Rocha'). The extension can be used immediately after installation without any account.

Permission risk

High-risk permissions

This estimate uses declared permissions and host permissions to assess access scope and sensitivity.

扩展能力较强：storage、scripting
主机权限覆盖范围较宽

Publisher

Scope Master

Independent publisher

Email: [email protected]
Phone: --
Address: --

Public contact fields are shown above. Developer portfolio pages are available on paid accounts.

View developer portfolio

Permissions

Host access