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Auth51 alternatives & similar sites

Auth51 — Identity, authorization, and audit for AI agents — 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 Artificial Intelligence →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
intentgate.app ↗	74 match 2 shared topics	IntentGate — Authorization for AI agents	Netherlands~ en	information-and-network-security	robotsllmsaihumans	emailphone	none
siteenforceauth.com ↗	72 match 2 shared topics	EnforceAuth — Authorization for the AI agent era	en	artificial-intelligence Sanity	robotsllmsaihumans	emailphone	none
astracipher.com ↗	70 match 2 shared topics	AstraCipher — Identity for the Age of AI Agents	en	information-and-network-security	robots llmsaihumans	emailphone	partial · 8
provenlog.com ↗	70 match 2 shared topics	ProvenLog — Tamper-evident audit trails for AI agents	en	information-and-network-security	robotsllmsaihumans	emailphone	none
vorim.ai ↗	70 match 2 shared topics	Vorim AI — Agent Identity and Trust Layer for AI Systems	en	information-and-network-security	robots llmsaihumans	emailphone	none
astrix.security ↗	69 match 2 shared topics	Identity Security for AI Agents & NHIs \| Astrix Security	en	information-and-network-security WordPress	robots llmsaihumans	emailphone	none
vouch-protocol.com ↗	69 match 2 shared topics	Vouch Protocol - Identity & Accountability for AI Agents	en	artificial-intelligence	robots llmsaihumans	emailphone	partial · 8
proxy0.dev ↗	69 match 2 shared topics	proxy0 - Guardrails for AI Agents	en	artificial-intelligence Spree Commerce	robotsllmsaihumans	emailphone	none
1id.com ↗	69 match 2 shared topics	1id.com — Hardware-Backed Identity for AI Agents & Relying Parties	en	information-and-network-security	robots llmsaihumans	emailphone	none
atellagent.com ↗	69 match 2 shared topics	Atellagent \| Policy-Driven Authorization For AI Execution	en	artificial-intelligence	robotsllmsaihumans	emailphone	none
provenanceone.ai ↗	69 match 2 shared topics	ProvenanceOne — Scale Agentic AI Safely	en	artificial-intelligence	robotsllmsaihumans	emailphone	none
vuneum.com ↗	69 match 2 shared topics	Vuneum — Trust and Payment Layer for AI Agents	en	artificial-intelligence	robotsllmsaihumans	emailphone	none
protegolayers.com ↗	68 match 2 shared topics	Agent Safety Layer — On-chain Policy Enforcement for AI Agents	en	information-and-network-security	robotsllmsaihumans	emailphone	none
athenyx.ai ↗	68 match 2 shared topics	Athenyx — The Safety Layer for Autonomous AI Agents	en	artificial-intelligence	robotsllmsaihumans	emailphone	none
lithtrix.com ↗	68 match 2 shared topics	Lithtrix — The agent harness. Identity, memory, trust.	en	artificial-intelligence	robotsllmsaihumans	emailphone	none
atlasprotocol.ai ↗	68 match 2 shared topics	Atlas Protocol — bounded authority for autonomous agents	en	information-and-network-security	robotsllmsaihumans	emailphone	none
vpnsource.com ↗	68 match 2 shared topics	TopAgentHub — AI Agent Audit & Control Platform	en	artificial-intelligence	robotsllmsaihumans	emailphone	none
asymptotelabs.ai ↗	68 match 2 shared topics	Asymptote: The Security Harness for AI Agents	en	artificial-intelligence	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.