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Endyinboxes alternatives & similar sites

Endy Inboxes | Automated Cold Email Infrastructure — 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
slicey.ai ↗	75 match shared topic	Slicey: Cold Email Infrastructure \| High deliverability Inboxes	en	email	robotsllmsaihumans	emailphone	none
doyoumail.com ↗	70 match shared topic	DoYouMail - Unlimited Cold Email Infrastructure for Less Than $1	en	email	robotsllmsaihumans	emailphone	none
inboxautomation.ai ↗	70 match shared topic	Cold Email Infrastructure & Mailbox Setup \| Inbox Automation	United States~ en	email	robotsllmsaihumans	emailphone	partial · 8
mailin.ai ↗	70 match shared topic	Best Price to Deliverability Cold Email Inboxes	en	email	robotsllmsaihumans	emailphone	none
inboxkit.com ↗	70 match shared topic	InboxKit: US-IP Google & Microsoft Cold Email Infrastructure	en	email	robotsllmsaihumans	emailphone	none
inboxnavigator.com ↗	70 match shared topic	InboxNavigator - Cold Email Infrastructure, Built For You	United States~ en	email	robotsllmsaihumans	emailphone	partial · 7
wizmail.io ↗	70 match shared topic	WizMail \| Cold Email Inboxes – Google & Microsoft	en	email	robotsllmsaihumans	emailphone	none
frostmailer.com ↗	65 match shared topic	Cold Email Mailboxes from €0.30 \| Frostmailer	en	email	robotsllmsaihumans	emailphone	none
zapmail.ai ↗	65 match shared topic	Zapmail: Boost Email Deliverability with Affordable Google Workspace & Automated Setup	en	email	robotsllmsaihumans	emailphone	none
duocircle.com ↗	65 match shared topic	DuoCircle: Email infrastructure for organizations the incumbents won't engage with	en	email	robots llmsaihumans	emailphone	full · 12
hover.com ↗	60 match shared topic	Domain Names \| Buy Domains & Email At Hover.com	en	email	robotsllmsaihumans	emailphone	none
benchmarkemail.com ↗	60 match shared topic	Email Marketing Software - Benchmark Email	en	email WordPress WooCommerce	robotsllmsaihumans	emailphone	none
authsmtp.com ↗	60 match shared topic	Outgoing authenticated SMTP server and email relay service (solves most SMTP and email relay errors).	en	email	robotsllmsaihumans	emailphone	none
absolute-email.net ↗	60 match shared topic	Get a custom business email address, website or domain today!	UK~ en	email	robotsllmsaihumans	emailphone	none
fastmail.com ↗	60 match shared topic	Email and calendar made better \| Fastmail	en	email	robotsllmsaihumans	emailphone	none
istmp.email ↗	60 match shared topic	istmp.email \| Stop fake signups and disposable emails in real time	en	email	robotsllmsaihumans	emailphone	partial · 8
mutantmail.com ↗	60 match shared topic	Manage Multiple Email Addresses Like a Pro - Mutant Mail	en	email	robotsllmsaihumans	emailphone	none
ymlp.com ↗	60 match shared topic	Email Marketing Software - YMLP	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.