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CoreCub - The Essential Developer Toolkit — 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 Email →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
cmdsend.com ↗	68 match 1 shared topics	CmdSend - The Email API Developers Love	en	email	robotsllmsaihumans	emailphone	none
themailbox.app ↗	65 match 1 shared topics	Mailbox — Local SMTP Server for Developers	en	email	robotsllmsaihumans	emailphone	full · 10
spamwatchers.com ↗	65 match 1 shared topics	How to Avoid Spam: Essential Tips for a Clean Inbox \| Temp-Mail.now	en	email	robotsllmsaihumans	emailphone	none
spamcalc.net ↗	65 match 1 shared topics	How to Avoid Spam: Essential Tips for a Clean Inbox \| Temp-Mail.now	en	email	robotsllmsaihumans	emailphone	none
1-email.com ↗	64 match 1 shared topics	1-Email.com — Email Verification API for Developers	en	email	robotsllmsaihumans	emailphone	none
helohub.com ↗	64 match 1 shared topics	HeloHub - Email & DNS Tools	en	email	robotsllmsaihumans	emailphone	none
herobounce.com ↗	64 match 1 shared topics	HeroBounce - The B2B Email Verifier That Resolves What Others Give Up On	en	email	robots llmsaihumans	emailphone	none
theinboxmd.com ↗	63 match 1 shared topics	The InboxMD™ by ESC Hub - Join the Waitlist	en	email	robotsllmsaihumans	emailphone	none
magicsmtp.com ↗	63 match 1 shared topics	Magic SMTP - The Ultimate Control Panel for Email Infrastructure	en	email	robotsllmsaihumans	emailphone	none
nobounceapi.com ↗	63 match 1 shared topics	NoBounce - The Best Email Validator	en	email	robotsllmsaihumans	emailphone	none
theinboxmasters.com ↗	63 match 1 shared topics	Home - theinboxmasters.com	en	email WordPress WooCommerce	robots llmsaihumans	emailphone	none
captchainbox.com ↗	63 match 1 shared topics	Captchainbox - The CAPTCHA for your inbox	en	email	robotsllmsaihumans	emailphone	none
spamtest.io ↗	62 match 1 shared topics	SpamTest.io - Free Email Spam Score Tester. Unlimited. No Signup.	en	email	robotsllmsaihumans	emailphone	none
spammail.org ↗	62 match 1 shared topics	SpamMail.org — Free Disposable Email, Ready in Seconds	en	email	robots llmsaihumans	emailphone	partial · 8
routemailbox.com ↗	62 match 1 shared topics	RouteMailbox - The simplest way to start a newsletter	en	email	robotsllmsaihumans	emailphone	none
avocadomail.site ↗	62 match 1 shared topics	AvocadoMail — Fresh Email Forwarding	en	email	robotsllmsaihumans	emailphone	none
ctrl-desk.com ↗	62 match 1 shared topics	Ctrl-Desk — The email client that knows your business.	en	email	robotsllmsaihumans	emailphone	none
123qwe.com ↗	62 match 1 shared topics	ISP Mail Tutorial (Caramel Edition)	en	email	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.