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InboxDebug - Email API Testing & Debugging — 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
inboxical.com ↗	68 match 1 shared topics	Inboxical — Email Testing API for Developers	en	email	robots llmsaihumans	emailphone	partial · 9
inboxsim.com ↗	67 match 1 shared topics	InboxSim \| Email Testing Made Simple - InboxSim	en	email	robotsllmsaihumans	emailphone	none
tossend.com ↗	67 match 1 shared topics	TosSend - Email API for Developers	en	email	robotsllmsaihumans	emailphone	none
inboxpirates.com ↗	67 match 1 shared topics	Email Preview & Email Testing Tool \| Inbox Pirates	en	email Lightspeed	robotsllmsaihumans	emailphone	none
inbox-ninja.com ↗	67 match 1 shared topics	Inbox Ninja - Free Email Deliverability Testing Tool	en	email	robotsllmsaihumans	emailphone	none
inbox-ninjas.com ↗	67 match 1 shared topics	Inbox Ninja - Free Email Deliverability Testing Tool	en	email	robotsllmsaihumans	emailphone	none
inboxmonster.com ↗	66 match 1 shared topics	Inbox Monster \| Email Testing and Deliverability Platform	en	email	robotsllmsaihumans	emailphone	none
meiz.io ↗	66 match 1 shared topics	Meiz - Email Marketing Agency	en	email	robotsllmsaihumans	emailphone	none
backendtechapi.com ↗	66 match 1 shared topics	email API with resend	en	email	robotsllmsaihumans	emailphone	none
inboxplan.com ↗	66 match 1 shared topics	InboxPlan - Email Warm-up & Deliverability Platform	en	email	robotsllmsaihumans	emailphone	none
inboxdetect.com ↗	66 match 1 shared topics	InboxDetect — Email Intelligence	en	email	robotsllmsaihumans	emailphone	none
3drake.com ↗	66 match 1 shared topics	3Drake - Email Gateway API	en	email	robotsllmsaihumans	emailphone	none
inboxissue.com ↗	66 match 1 shared topics	Email Deliverability Testing for Corporate Inboxes \| InboxIssue	en	email	robots llmsaihumans	emailphone	full · 12
inboxpure.com ↗	65 match 1 shared topics	Inbox Pure \| Spam Filtering & Clean Email Client	en	email	robotsllmsaihumans	emailphone	none
inboxxpert.com ↗	65 match 1 shared topics	Inbox Xpert – Email Marketing Tactics	en	email WordPress	robotsllmsaihumans	emailphone	none
emailjet.be ↗	65 match 1 shared topics	Mailjet: Best Email Marketing Software & Email API for Teams	Belgium en	email WordPress WooCommerce	robotsllmsaihumans	emailphone	none
inboxsys.com ↗	65 match 1 shared topics	InboxSys - Email Matters - Deliverability	en	email WordPress	robots llmsaihumans	emailphone	none
0bounce.net ↗	65 match 1 shared topics	0Bounce - Email Checker	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.