The password is the breach waiting to happen.
Passwords are attack currency
Passwords leak, get reused, and are harvested at scale — turning every breach elsewhere into fuel for credential stuffing and replay against you.
Automation outruns defenders
AI-powered bots, credential-stuffing frameworks, and adversary-in-the-middle kits exploit static secrets in milliseconds. Identity has to disrupt automation, not depend on it.
Legacy MFA gets relayed
Ordinary OTP and push MFA can be phished and replayed in real time. If a code is just a number, a phishing kit can pass it straight through.
What passwordless authentication actually is
A one-time code a bot can read — but can't use.
We deliver a random OTP by email and/or SMS, then add simple color-and-style formatting instructions that require human cognition to complete correctly. Faster login for your users; unusable credentials for attackers.
Color & style challenge
Every OTP carries a simple visual instruction. Real users complete it naturally; bots, phishing kits, and replay scripts can't interpret or execute it inside the session time limit.
Built to disrupt automation
Rainbow Secure watches every login in real time, detecting and blocking brute-force, credential stuffing, phishing, and session-replay activity as it happens.
No new gaps
Nothing static to store, rotate, or reset. Users authenticate smoothly while you remove the single largest root cause of identity breaches: reusable credentials.
Four steps. About five seconds.
Start login
The user enters their identifier — no password to type, remember, or reset.
Receive the OTP
A random one-time code is delivered by email and/or SMS, with an optional split for extra safety.
Solve the visual step
The code arrives with a color-and-style instruction only a human can complete correctly in time.
Access granted
The code expires fast, is bound to device and session, and can't be reused or replayed.
Everything you need to go passwordless
Simple, fast one-time codes
Split OTP for extra safety
Works everywhere
IdP integration
Color & style formatted OTP
A quick visual step adds a cognitive layer bots and scripts can't mimic.
No passwords to manage
Removes resets, lockouts, and password-based phishing exposure.
Phishing-resistant delivery
Codes expire quickly, bind to device and session, and can't be reused.
Any device
Desktop, mobile, or shared terminals — no hardware tokens required.
Why cognitive OTP wins
| Capability | Passwords + legacy MFA | Standard OTP | Rainbow Secure Passwordless |
|---|---|---|---|
| No reusable secret to steal | No | Yes | Yes |
| Resists real-time phishing / AiTM relay | No | Limited | Yes |
| Blocks bot & automation replay | No | No | Yes |
| No hardware token required | Varies | Yes | Yes |
| Removes password resets & lockouts | No | No | Yes |
| Works on any device & shared terminals | Yes | Yes | Yes |
Stronger security, simpler login, lower cost
Eliminate credential attacks
Neutralize brute-force, phishing, credential stuffing, replay, and password-guessing by removing the reusable static password they all depend on.
Simplify the login experience
No more complex passwords to create, remember, or rotate — authentication becomes faster and more intuitive for every user.
Reduce IT cost & load
Fewer support tickets, fewer lockouts, and lower operational overhead tied to password management and resets.
Passwordless OTP login
FAQ
Passwordless authentication, answered
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What is passwordless authentication?
Passwordless authentication lets users log in without a static password. Instead of a reusable secret, access is verified with a secure one-time code delivered through a trusted channel. Rainbow Secure adds a color-and-style formatting challenge to that code, so a person can complete it instantly but bots and phishing kits cannot.
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How is Rainbow Secure passwordless different from a normal OTP?
A normal OTP is just a number that can be phished or relayed in real time. Rainbow Secure wraps each one-time code in simple color and style instructions that require human cognition to complete correctly within the session time limit. Automation, replay scripts, and adversary-in-the-middle kits can read the digits but cannot interpret the visual challenge — so a stolen code is useless.
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Is passwordless more secure than passwords plus MFA?
Yes. Passwords and legacy MFA rely on reusable secrets that leak, get harvested, and fuel credential-stuffing and replay attacks. Removing the static password eliminates the single largest root cause of identity breaches, and the cognitive OTP layer defeats the automated attacks that get past ordinary MFA.
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Where can I use it?
It works across websites, SaaS applications, WordPress, custom applications, and enterprise IAM workflows, and integrates with identity providers such as Microsoft Entra, Okta, and Google Workspace. It runs on any device, with no hardware tokens required.
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How much does it cost?
Passwordless OTP-based login starts at $2.00 per user per month. Volume discounts apply at higher user tiers, and a custom enterprise quote is available.
See passwordless login in action
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