What do you need to do to the web today?

⌘K
SEO + AEO Audit
Audit any URL in 5 seconds
Open ↵
AA
Contrast Checker
WCAG AA + AAA in two colors
KB
Webflow Embed Sizer
Will it fit the cap?
3 of 13 tools match
Everything runs locally — nothing uploaded
Browse all thirteen

Thirteen tools. One place you actually come back to.

Each one does a single job well, and most run entirely in your browser — nothing uploaded, nothing tracked.

Open the tools
Kitlumen promotional banner showing the tool set on a light background
The toolkit

Pick up where you left off.

A focused catalog, not a junk drawer. Every tool does one job well and gets out of your way.

SEO & AEO

SEO + AEO Audit

Grade any URL in 5 seconds.

Open tool →SEO & AEO

Open Graph Preview

See the link before you ship it.

Open tool →Accessibility

Contrast Checker

WCAG AA + AAA from two colors.

Open tool →Webflow

Webflow Embed Sizer

Will it fit the embed cap?

Open tool →

Browse all tools

See the full catalog, sorted by category.

View catalog →
78
Overall
Kitlumen Site Analyzer report with an overall score, Core Web Vitals and fixes ranked by impact
Site Analyzer

A graded report, with the exact fixes.

Crawl any URL and get performance, semantics, metadata and accessibility scored — then a list of fixes ranked by the impact each one actually has.

61
Performance
84
Accessibility
92
Semantics
75
Metadata

Web tools for developers · Thirteen tools, all live

Every web tool you reach for, in one place.

SEO & AEO audits, speed and accessibility testing, Open Graph previews, schema tooling and security checks — most run right in your browser. Built for developers who ship.

Launch app →Browse tools

9

focused tools

Browser-first

no upload, no telemetry

Live

updated weekly

Kitlumen tools catalog showing thirteen focused web tools with search and category filters
Runs locally
Score 78
Pricing

Simple, honest pricing.

Start with the tools you need. Upgrade for higher limits, saved history, and API access.

Starter
$4.99/mo

For occasional checks — the whole toolkit, capped at 10 runs a month.

  • Saved reports & history
  • Email support
Get started
ProMost popular
$19.99/mo

Unlimited everything — for people who ship every day.

  • Everything in Basic
  • Priority + early-access tools
  • Saved history & exports
  • Higher limits & bulk runs
  • Priority support
Get started
Contrast Grid

Check the whole palette at once.

Every pair graded against WCAG AA and AAA, at both text sizes, with a suggested fix the moment a combination fails.

#0A0A0A
#0075FF
#7FB0FF
#F2F3F6
#FFFFFF
18 of 20 pairs pass AA
Kitlumen Contrast Grid checking a colour palette against WCAG AA and AAA at every pairing
Get started

Open a tool. Solve the problem.

No install, no credit card to browse. Create a free account to save your reports and stay on the changelog.

Browse the tools →See the roadmap