AI 产品解读An in-browser protractor overlay that lets users measure angles on any webpage
Users need to quickly measure angles on screen content (designs, images, diagrams, etc.) without switching to external measurement tools
User clicks the extension icon → protractor overlay appears centered on the current page → user drags two guide arms to align with a vertex → angle is displayed in real-time → user can resize, rotate, lock, nudge, and customize appearance via options page → click extension icon again to hide
Overlay a resizable protractor on any webpageTwo draggable guide arms to match any vertex for angle measurementDisplay angle in configurable units (degrees or radians) with adjustable precisionCustomize colors for arc, display, circle, guides, and markersRotate, resize, lock, and nudge the protractor positionConfigurable marker interval, length, snapping, and label display
- 目标用户
- Students and educators measuring angles for geometry/math / Designers verifying angles in web layouts or images / Engineers and architects inspecting visual diagrams / Government agencies and schools (mentioned in FAQ)
付费分析未识别到付费功能
Extension is fully free and open source under MIT license. No premium/upgrade/billing/subscription/plan keywords found anywhere. The 'subscribe' hits are from the PubSub (publish-subscribe) messaging pattern used internally, not payment subscriptions. The only monetization is a voluntary 'Buy Me a Coffee' donation link on welcome.html. No features are gated behind payment.
- 置信度
- 100
- 支付平台
- --
- 来源
- AI / 高
- 需要登录
- 否
- 登录理由
- The extension is a purely local overlay tool. It uses chrome.storage.sync for saving user preferences and chrome.scripting to inject CSS/JS into the active tab. There is no authentication flow, no account creation, no API keys, and no destination service requiring login. The 'account' hit in guide.js:132 is a code comment about math: 'Must account for global rotation'
Awesome tool, wish I could double click on a number/angle to copy it.
just what i needed
but it is not visible over some colors ,NEED IN BLACK COLOR
Doesn't ever open. Totally unusable.
Great tool for measure joint angles for patients virtually! Thanks!
Simple, stylish and perfect for what I needed.
It works :D
Exactly what I wanted. Thank you!
Really helpful for me. From my window I can see a church spire on the horizon, about 4 miles away. I took a reading with my compass (297°) then, using the protractor, I centred it on my location in Google Maps and set the line to that reading. Lo and behold the line went very close to a church marked on the map that was actually 4.14 miles away! (The church was St. Jude's in Hampstead, London. Download the protractor and you should be able to work out which street I live in!)
It is perfect. It is accurate and no bugs or unworking things on it. Perfect for geo homework.