SilentAuth
Privacy-First · No Tracking Cookies · GDPR Compliant

Human Presence
Infrastructure
for the Modern Web

Zero-cookie CAPTCHA, API protection, and execution authorization gates. Privacy-first verification for the modern web.

Start FreeRead Docs
No setup fee
Free tier available
GDPR ready
silentauth verify
const sa = new SilentAuth({
clientId: "proj_abc123"
});
const result = await sa.verify({
action: "log
23ms
Avg latency
99.97%
Uptime
0 cookies
Tracking
Our Products

Two Products, One Platform

Whether you're protecting web forms from bots or adding human oversight to AI agents, SilentAuth has you covered.

CAPTCHA Protection

Invisible bot protection for your forms

How it works

1Add script to your page
2User fills out form normally
3Get verification token on submit
4Validate token on your server
5Process form or block bot
Zero Friction
Users never see a challenge
GDPR Compliant
No tracking cookies or cross-site identifiers
99.9% Accuracy
ML-powered behavioral analysis
Learn More

Execution Gates

Human-in-the-loop for AI and automation

How it works

1Agent declares intent
2Policy evaluation
3Human receives notification
4Approver reviews and decides
5Signed permit issued
6Backend validates and executes
Multi-Channel Alerts
Email, Slack, webhooks, and more
Cryptographic Permits
RSA-signed, time-limited tokens
Offline Validation
Verify permits without network calls
Learn More
Designed for scale

Who uses SilentAuth?

Digital Agencies

Protect hundreds of client WordPress sites and WooCommerce checkouts with a single Master Dashboard. Drop Google's tracking scripts to ensure immediate EU GDPR compliance for all your clients.

View WordPress Docs

SaaS Developers

Stop relying on frontend CAPTCHAs to protect backend data. Use our native Next.js, React, and Python SDKs to verify cryptographically signed receipts directly on your REST APIs.

View API Reference

DevOps & Platform Teams

Gate critical automation. Require cryptographic human approval (via passkeys or audio presence) before a Jenkins pipeline runs, a Terraform script applies, or an AI Agent drops a database.

View Execution Auth
Technical Architecture

The 4-Layer Adaptive Stack

Not every request requires friction. Our engine calculates risk in real-time to provide invisible security when possible, and mathematically proven presence when critical.

L1

Edge-Native Risk Engine

Runs invisibly at the edge (Cloudflare/Vercel). Evaluates IP reputation, velocity, and device fingerprints in < 10ms. Trusted traffic receives an immediate Invisible Pass.

L2

Interactive Challenge

Triggered only for medium risk scores. Features sleek, customizable "I am human" checkboxes or lightweight sliding puzzles that do not train third-party AI models on your users.

L3

Cryptographic Receipt

Upon passing L2, the system issues an RS256 signed JWT with a strict 60-second TTL. Includes a unique nonce (`jti`) ensuring tokens are consumed once via Redis to prevent replay attacks.

L4

VINAC-FM

ENTERPRISE

Mathematically proves physical presence for high-risk actions. Uses near-ultrasonic acoustic verification (18.5kHz) via Web Audio API, or WebAuthn passkeys for critical DevOps execution gates.

How it works

Up and running in minutes

Three steps from zero to bulletproof. No security expertise required — just integrate and ship.

Step 01

Install the SDK

One line. Any framework.

Drop in our lightweight SDK — under 4 KB gzipped. Works with Next.js, React, Vue, plain HTML, or any backend via REST. No build step, no configuration files, no breaking changes.

Under 4 KB gzipped
Zero runtime dependencies
TypeScript types included
Works server-side & edge
install.ts
npm install @silentauth/js

// or via CDN
<script src="https://cdn.silentauth.io/v2/sa.min.js"></script>
< 10ms
Edge latency
Zero cookies
GDPR by design
99.97%
Uptime SLA
100%
Audit coverage

Works where you work.

Native SDKs and plugins for the modern stack.

Next.js / React
Node.js
Python
WordPress
Cloudflare Workers
Terraform
Coming soon:GoRubyPHPJavaGitHub ActionsDocker
2M+
Verifications served
500+
Active projects
99.97%
Uptime SLA
<50ms
Median latency

Trusted by security-conscious teams

From indie developers to enterprise security leads.

"We replaced reCAPTCHA across 14 services in a single afternoon. SilentAuth's cryptographic receipts integrate perfectly with our .NET backend — no proxy calls, just verify the signature."

MC
Marcus Chen
CTO, Finstream Technologies

"The Execution Gate feature alone was worth the upgrade. Our CI/CD pipelines now require human approval for production deploys. It's the missing guardrail for AI-assisted DevOps."

PN
Priya Nakamura
Head of Security, Orbital Labs

"GDPR compliance was blocking our EU rollout for months. SilentAuth's no-cookie, no-fingerprint approach let us ship in two weeks. Our DPO signed off same day."

TM
Tobias Meier
Lead Engineer, Datavault GmbH
Pricing

Simple, transparent pricing

Start free. Scale as your verification needs grow. No hidden fees.

Free
$0/forever

For side projects and personal sites.

  • 1 project
  • 5,000 verifications / mo
  • Layer 1-2 CAPTCHA
  • WordPress plugin
  • Basic risk scoring
  • Community support
Get Started
Pro
$29/per month

For growing products that need custom rules.

  • 3 projects
  • 50,000 verifications / mo
  • Custom rules engine
  • Webhook notifications
  • Shopify integration
  • Analytics dashboard
  • Email support
Start Pro Trial
Most Popular
Business
$99/per month

Cryptographic receipts, team access, and Execution Gates.

  • 10 projects
  • 250,000 verifications / mo
  • Cryptographic receipts (Layer 3)
  • Team roles & permissions
  • Execution Gate included
  • Priority API access
  • Priority support
Start Business Trial
Enterprise
Custom/contact us

High-assurance verification with SLA guarantees.

  • Unlimited projects
  • 1M+ verifications / mo
  • VINAC-FM Layer 4 assurance
  • Custom SLA agreement
  • SOC2 Type II roadmap
  • Dedicated support engineer
  • On-prem deployment option
Contact Sales

All plans include SSL encryption. No credit card required for Free tier.