The gap
Checking one page properly means a performance tool, an SEO checker, a social preview tester and the developer tools open side by side, and the results still have to be rewritten before they go into a ticket.
Developer tools
Plumbline
A Chrome and Edge extension that checks the open page in one click: Core Web Vitals measured in your browser, search basics, images, Open Graph and page weight, as plain sentences you can copy.
- Chrome (Manifest V3)
- Microsoft Edge
- JavaScript
- Web Performance APIs
- Coming soon
Coming soon
Not published on its store yet, so there is no buy or download link. PN Scripts does not take payment for it here.
What it solves
What it is
Plumbline reads the open page and the browser's own performance data in one click and lists every finding as one plain sentence, with a Markdown report ready to paste.
How you use it
One click on any page gives the vitals, the search basics, the image problems and the share preview, in English or Bulgarian, without sending the page anywhere.
For developers, SEO specialists and agencies who check pages every day, Plumbline is a private, permission-light page check that combines Core Web Vitals, SEO, content and sharing in one popup.
Who it is for
Use it when
- Checking a page before and after a release or a theme change
- Writing a clear SEO or performance ticket for a developer or a client
- Reviewing landing pages for alt texts, Open Graph and structured data
Built for
- Web developers and front-end engineers
- SEO specialists, content editors and web agencies
What is inside
Vitals from your own browser
LCP with the element and image that set it, CLS from the largest window of layout shifts, INP from your interactions so far, FCP and TTFB, each with a good, needs work or poor rating. They are lab values for this visit; the popup says so.
Search basics without guesswork
noindex is found in meta robots, googlebot and the X-Robots-Tag header. Title and description lengths, canonical problems such as relative or conflicting links, a missing lang, a viewport that blocks zoom, invalid hreflang codes and uncompressed HTML each get one clear sentence.
Images, headings and sharing
Images without alt, without width and height or lazy-loaded in the first screen are listed and can be outlined on the page. The heading outline shows skipped levels, and the link preview shows what a shared link will look like from the Open Graph tags.
Private by design
Plumbline runs only when you click it, reads only that tab and makes one extra HEAD request for the page's own headers. There is no account, no analytics and no server. The report copies as Markdown or saves as JSON, in English or Bulgarian.
Gallery
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Specs
- Availability
- Coming soon
- Vendor
- PN Scripts
- Type
- Extension
- Platforms
- JavaScript
- Pricing
- One-time purchase Price to be announced.
- License
- Proprietary
- Deployment
- Download (ZIP with the unpacked extension for Chromium browsers)
- Maturity
- v1.0.0
Compatibility
| Platform or runtime | Supported versions | Tested up to |
|---|---|---|
| Google Chrome | 116 or newer | 155 (Linux) |
| Microsoft Edge and other Chromium browsers | 116 or newer | not tested |
Stack
- Chrome (Manifest V3)
- Microsoft Edge
- JavaScript
- Web Performance APIs
Plumbline is coming soon
It is finished and tested. It is not on sale yet; this page will say where to get it when it is.
Coming soon
Not published on its store yet, so there is no buy or download link. PN Scripts does not take payment for it here.
Questions
A browser extension for Chrome, Edge and other Chromium browsers that checks the open page in one click for Core Web Vitals, SEO basics, headings and images, Open Graph and structured data, and page weight, with Markdown and JSON export.
Chrome, Edge, Brave, Opera or another Chromium browser 116 or newer; you load the unzipped folder in developer mode. It was tested in Google Chrome 155 on Linux. Firefox and Safari are not supported.
It checks one page at a time and is not a crawler or a monitoring service. Values are measured once in your browser, not collected from real users, and pages the browser protects, such as chrome:// pages, cannot be checked.
It is plain JavaScript on Manifest V3 and the browser's performance APIs. The rules, thresholds and the English and Bulgarian texts are covered by a Node test suite, and the extension was loaded into Google Chrome 155 and run against a local demo shop with typical problems. Created with AI assistance; the rules and texts were checked by PN Scripts with the automated tests and in a real Chrome, which produced the screenshots.
It is not on sale yet. When it is, this page will link to the store; PN Scripts does not take payment on this site.
