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Extensiontest alternatives & similar sites

Extension Compatibility Tester — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Web Development →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
dartsuite.com ↗	68 match 1 shared topics	DARTSuite - Accessibility Testing & Compliance Platform \| DARTSuite	en	web-development	robotsllmsaihumans	emailphone	none
a11yscanner.com ↗	68 match 1 shared topics	A11yScanner - Website Accessibility Testing Tool \| WCAG 2.2 Compliance	en	web-development	robotsllmsaihumans	emailphone	none
customtagwizard.com ↗	67 match 1 shared topics	CustomTag Wizard - VSCode Extension	en	web-development	robotsllmsaihumans	emailphone	none
data2site.com ↗	67 match 1 shared topics	Joomla Extensions	en	web-development Joomla	robotsllmsaihumans	emailphone	none
hemantpawar.com ↗	67 match 1 shared topics	Hemant Pawar - Firefox & Chrome extension developer	en	web-development	robotsllmsaihumans	emailphone	none
data-dumper.com ↗	66 match 1 shared topics	Data Dumper - Browser Extension for Web Scraping and OSINT	en	web-development	robotsllmsaihumans	emailphone	none
httpcompression.com ↗	66 match 1 shared topics	HTTP Compression Check \| Test gzip, Brotli, zstd, deflate	en	web-development	robotsllmsaihumans	emailphone	none
http.app ↗	65 match 1 shared topics	HTTP Status Tester	en	web-development Wix	robotsllmsaihumans	emailphone	none
aphiria.com ↗	65 match 1 shared topics	Aphiria - A simple, extensible REST API framework	en	web-development	robotsllmsaihumans	emailphone	none
britishit.com ↗	65 match 1 shared topics	British IT 360° Global IT Solution Company	en	web-development WordPress	robots llmsaihumans	emailphone	partial · 8
vintsolution.com ↗	65 match 1 shared topics	Vint Solution - Complete Tech-Solution Company	en	web-development	robotsllmsaihumans	emailphone	none
stainscode.com ↗	65 match 1 shared topics	stainscode — Builder of web products, extensions & full stack tools	en	web-development Spree Commerce	robotsllmsaihumans	emailphone	none
a11yagent.ai ↗	65 match 1 shared topics	a11y agent — Real-time accessibility auditing	en	web-development	robotsllmsaihumans	emailphone	none
bangaaru.digital ↗	65 match 1 shared topics	Bangaaru.digital - React Native Accessibility Experts	en	web-development	robotsllmsaihumans	emailphone	none
btabaku.com ↗	65 match 1 shared topics	BTABAKU – Site Reliability Engineer & Integration Developer	AL~ en	web-development	robotsllmsaihumans	emailphone	none
ankuardata.com ↗	64 match 1 shared topics	HOME - AnkuarData - Documentation \| Visibility \| DataCollection	en	web-development WordPress WooCommerce	robotsllmsaihumans	email phone	none
customwp.net ↗	64 match 1 shared topics	Custom WordPress Plugin Development & Feature Extensions	en	web-development	robotsllmsaihumans	emailphone	partial · 3
a11yup.com ↗	64 match 1 shared topics	A11y Up: Level up your digital accessibility	en	web-development	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.