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Zapauth alternatives & similar sites

ZapAuth – Secure SMS Authentication & OTP Verification API — 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 Information And Network Security →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
trueauth.io ↗	73 match 2 shared topics	TrueAuth - Secure Authentication Solutions	en	software-and-applications	robotsllmsaihumans	emailphone	none
id-able.com ↗	72 match 2 shared topics	IDABLE - Biometric Authentication API	United States~ en	software-and-applications	robotsllmsaihumans	email phone	none
idanchor.com ↗	70 match 2 shared topics	IDAnchor - Secure Identity Verification Platform	en	software-and-applications	robotsllmsaihumans	emailphone	none
1kosmos.com ↗	70 match 2 shared topics	Identity Verification & Passwordless Solutions \| 1Kosmos	en	information-and-network-security	robotsllmsaihumans	emailphone	none
owomario.com ↗	70 match 2 shared topics	VerifyHub - Verification Tools Hub	en	information-and-network-security	robotsllmsaihumans	emailphone	partial · 8
kyseen.com ↗	69 match 2 shared topics	Kyseen - Identity Verification Engine \| KYC, OCR, AML	en	information-and-network-security	robotsllmsaihumans	emailphone	none
fyduspay.com ↗	69 match 2 shared topics	UPI Pay Orange - Authentication System	en	software-and-applications	robotsllmsaihumans	emailphone	none
2auth.com ↗	69 match 2 shared topics	2Auth — Authenticator & Password Manager	en	software-and-applications	robotsllmsaihumans	emailphone	partial · 8
idmission.com ↗	69 match 2 shared topics	IDmission \| Identity Management System \| Biometric Security and Authentication Software	en	information-and-network-security	robotsllmsaihumans	emailphone	none
idanalyze.com ↗	68 match 2 shared topics	DESKO ID\|Analyze® – Authentication software \| DESKO GmbH	Germany~ en	software-and-applications ProcessWire	robotsllmsaihumans	email phone	none
1verif.com ↗	68 match 2 shared topics	1verif. Verification-as-a-Service	en	information-and-network-security	robotsllmsaihumans	emailphone	none
4jvo.com ↗	68 match 2 shared topics	P4 Authentication Service	en	software-and-applications	robotsllmsaihumans	emailphone	none
rkapply.com ↗	68 match 2 shared topics	P4 Authentication Service	en	software-and-applications	robotsllmsaihumans	emailphone	none
kycaid.com ↗	68 match 2 shared topics	KYC Verification & Compliance Service - KYCAID.com	en	information-and-network-security	robots llmsaihumans	emailphone	none
agechecked.org ↗	67 match 2 shared topics	Online Age Verification Software \| UK Gov Approved – AgeChecked	en	information-and-network-security WordPress WooCommerce	robotsllmsaihumans	emailphone	none
6otp.com ↗	67 match 2 shared topics	6OTP - Auto-Sync 2FA Authenticator \| Secure TOTP Codes Everywhere	en	software-and-applications	robotsllmsaihumans	emailphone	none
2faa.app ↗	67 match 2 shared topics	2FAA - Free Online 2FA Authenticator & Tools	en	information-and-network-security	robots llmsaihumans	emailphone	none
desktop-2fa.org ↗	67 match 2 shared topics	desktop‑2fa — Offline TOTP Authenticator	en	information-and-network-security	robotsllmsaihumans	emailphone	partial · 8

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.