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'
I don't know how to get it to work :(
It works great for what it is. Nothing much else to say. However, here's a suggestion: Allow the protractor to be moved via arrow keys, it would allow for more precise positioning of it.
Awesome worked fine on a .pdf file
Perfect for me. Works just fine with Google maps. I'm using it to find out the wind direction at any given windsurfing spot.
this is awesome! i was doing my geo homework on like and this made my life so much easier! keep up the good work.
This extension works really well, and prevents me from having to get out a physical protractor to place on my screen. Awesome.
Very nice tool. it does what I need.
Nice extension, works well. I usually do measures on map, where 0 is north. So will be nice to add offset angle for 0 in configuration page for freaks like me :-)
Perfect for what i needed
Great little extension, perfect for measuring angles in your browser.