devkit

Every dev tool you keep installing, in one side panel.

devkit clears a site's cache, checks its JSON-LD, grades its headers, rewrites its requests and asks your own model about the page. One Chrome extension instead of a toolbar full of them.

Add to Chrome Download the latest build
$ git clone https://github.com/maxgfr/devkit && cd devkit && pnpm install && pnpm build
Demo product page: Stoneware Mug, 350 ml, priced €24,90, with a description and an Add to cart button. devkit side panel, Inspect › Structured data: Product block with findings, including the price €24,90 that must be a plain number and a missing description.
Fig. 1 Structured data analyzer on a demo product page (synthetic, made for this figure).
  1. 1 offers.price "€24,90" must be a plain number: Google drops the price snippet.
  2. 2 The page has a description, its Product JSON-LD has none.
  3. 3 The BreadcrumbList block is invalid JSON (a trailing comma, line 1, column 217), so Google sees no breadcrumb. It is listed further down the panel.

Type what you need.

Alt Shift D opens the palette on any tab. Every tool is one search away: actions run on the spot, panels open in the side panel. This is the extension's real command list. Try it.

Seven tabs. The tools you open forty times a day.

The same tab bar as the extension. Pick one.

devkit Inspect tab: the page report, one row per area with its status.

Inspect

What the page ships, read from the page itself: a page report, stack, SEO, structured data, Web Vitals, errors, links.

    Your model reads the page devkit just read.

    Every analysis sends the same data the inspectors show: the JSON-LD findings, the security checks, the Web Vitals, the captured errors, the page's main text. So the answer quotes the page, not a guess about it.

    Run
    Review structured data, on the demo page of Fig. 1
    Model
    claude-sonnet-5-5 through Anthropic's API
    Tokens
    1,100 in · 2,031 out
    Cost
    $0.023, shown before and after the call
    Found
    the trailing comma, the price format, the relative image URL
    • Any provider. The catalog comes live from models.dev and OpenRouter through llm-models; the offline fallback lists 209 providers and 6,343 models.
    • Or no provider. Point it at Ollama, LM Studio or Jan on localhost.
    • No devkit server. Calls go from your browser to your provider through llm-connect. The key is encrypted on your device (AES-GCM under a non-extractable key).
    • Thirteen analyses. Summarize, explain the stack, SEO audit, fix JSON-LD, security headers, performance, accessibility, console errors, explain selected code, write a Playwright test, extract data as JSON, meta tags, UI critique from a screenshot.
    devkit AI tab: Claude's structured data review of the demo page, ranked by impact.

    It asks before it touches anything.

    PermissionWhenWhy
    activeTab, scripting, storage, sidePanel, contextMenusinstallread the tab you are on, keep your settings, show the panel and menus
    declarativeNetRequest, debuggerinstallrequest rules, emulation and API mocks; Chrome does not let these two be optional
    browsingData, cookies, contentSettingsfirst useclear site data, edit cookies, block JavaScript on a site
    this site, or all sitesfirst usefollow you across tabs, check links, capture errors, rewrite requests

    The options page lists every permission devkit holds and revokes any of them. The accessibility audit runs axe-core in the page and says what automated checks cannot catch.

    Install in a minute.

    1. Add it to Chrome

      Install devkit from the Chrome Web Store. Chrome keeps it up to date on its own.

    2. Press Alt Shift D

      Type json-ld on any page. For AI, open the AI tab, pick a provider or a local server, paste a key, test, save.

    3. Or load a build yourself

      Download the zip from the latest release, or build it. Then open chrome://extensions, turn on Developer mode, click Load unpacked and pick the folder (.output/chrome-mv3 when you built it).

      $ pnpm install && pnpm build

    Chrome 116 or later. Each fix or feature merged on main ships as a new release, built and tested automatically, then submitted to the Chrome Web Store.