29 dev tools.
One extension.
Inspect CSS, audit accessibility, check WCAG contrast, measure Core Web Vitals, pick colours, capture screenshots and preview responsive layouts — without leaving your browser.
- Works on localhost, staging and pages behind a login
- Page content never reaches our servers
- One-time payment, no subscription
Everything you need in one Chrome extension
No more tab-hopping between a dozen different tools.
CSS Inspector
Edit any element's styles live with sliders, color pickers, and alignment controls. See changes instantly.
Screenshot Tool
Capture the visible area, full page scroll-stitch, or drag-to-select any region. One-click copy or download.
Responsive Preview
Test your site on iPhone SE, iPhone 14, iPad, laptop, and desktop viewports without resizing your browser.
Web Scraper
Hover and click any element to extract structured data from the whole page. Export as JSON or CSV.
Color Picker & Palette
Grab any color on the page with a precision eyedropper. Build and export palettes in one click.
Website Critique
Get a full UX audit across accessibility, SEO, performance, and design — with actionable fixes.
Why bother with another extension?
Because the alternative is a dozen of them, plus three online tools that can't see your staging site.
It works where online tools can't
Contrast checkers, SEO analysers and page-speed sites need a public URL. UltraDevKit runs inside the tab you already have open, so it works on localhost, staging, and anything behind a login — exactly where you do the work.
Nothing leaves your browser
Every tool runs locally on the page you're viewing. Page content, screenshots and scraped data stay on your machine — the only thing our servers ever receive is the email address you use to start a trial or buy a license. Safe for client work and internal dashboards.
Fewer clicks than DevTools
DevTools can do a lot of this, eventually. Hovering text to read its contrast ratio, dragging to measure a gap, or grabbing every colour on a page takes one action here instead of five panels and a computed-styles hunt.
One popup instead of twelve extensions
A colour picker, a ruler, a screenshot tool, a scraper, an SEO checker — normally five installs, five UIs, five updates. Here it's one popup and one shortcut: Ctrl+Shift+K.
Catch problems before review does
Run the accessibility audit and contrast checker before you open the PR, not after a client's compliance team files a ticket. Findings are scored by severity and link straight to the offending element.
Output you can hand to a client
Export a UX critique as PDF, broken links as CSV, accessibility findings as JSON, scraped data as JSON or CSV. The audit is evidence, not just something you saw on your screen.
A few things people use it for
- Front-end developers — check a build against the design spec, measure spacing, and fix contrast failures before they reach QA.
- Designers — pull the exact colours and fonts off any site, preview copy changes live, and screenshot the result.
- SEO consultants & agencies — audit meta tags, find broken links, measure Core Web Vitals, and export a client-ready report.
- QA and accessibility testers — scan for WCAG issues on staging, capture evidence, and attach it to the ticket.
What's included
- All 29 developer tools
- All future updates & new tools
- Priority email support
- Use on unlimited devices
- Lifetime access — no subscriptions
- 7-day free trial (no card required)
- Export data in JSON, CSV, PNG
- Works on Chrome, Edge, Brave, Opera
Frequently asked questions
Everything people ask before installing.
What is UltraDevKit?
UltraDevKit is a Chrome extension that bundles 29 web developer tools — a CSS inspector, accessibility audit, contrast checker, Core Web Vitals monitor, colour picker, screenshot capture, responsive preview and more — into a single popup that works on any website.
Is there a free trial?
Yes. Every feature is unlocked for a 7-day free trial and no credit card is required to start. After the trial you can buy lifetime access as a one-time payment.
Is UltraDevKit a subscription?
No. UltraDevKit is a one-time payment of $20 for lifetime access, including all future updates and new tools. There are no recurring fees.
Which browsers does it work in?
UltraDevKit works in any Chromium-based browser, including Google Chrome, Microsoft Edge, Brave, Arc and Opera.
Does UltraDevKit send my browsing data anywhere?
No. Every tool runs locally in your browser and page content is never uploaded to a server. The only data collected is the email address used to start a trial or buy a license.
How do I check colour contrast for WCAG compliance?
Open the Contrast Checker and hover any text. It shows the live contrast ratio with AA and AAA pass or fail badges, accounting for semi-transparent colours and text sitting over gradients, so you can fix accessibility issues before an audit does.
Can I measure Core Web Vitals with UltraDevKit?
Yes. The Performance tool reports LCP, CLS and INP alongside TTFB, first paint, request count, page weight broken down by resource type, and your slowest requests — on any page you visit, including staging sites behind a login.
Do I need to use Chrome DevTools as well?
For deep JavaScript debugging, yes. UltraDevKit covers the everyday visual and audit work — inspecting and tweaking CSS, measuring spacing, checking contrast and accessibility, capturing screenshots, and auditing SEO — in far fewer clicks than DevTools takes.
Can I use my license on more than one computer?
Yes. A lifetime license can be activated on unlimited devices you own.