user account concept as a vector illustration

Go Passwordless

Kno is the simplest way to add superior authentication to your website.

Get started: Free tier Why passwordless?

Free forever, no catch

Develop Faster

Add robust & reliable authentication in a snip

  • Predictable & easy to price
  • Cross browser & device tested
  • Just five lines of code. See docs.

Reduce Costs

Relieve sign in support headaches for good.

  • No passwords, no password resets
  • No MFA or account recovery
  • No password strength challenges

Add Value

Offer superior service to your customers

  • Improve conversion rates
  • Differentiate from social login
  • Impress with one-click-sign-in

Signing in just got a whole lot better

Frictionless, fast and simple to use. Your users will love Kno Authentication.

Goodbye passwords!

It's been nice knowing you.

Hard to remember, easy to guess. It's hard to think of good reasons to hold on to passwords.

Hello one-click-sign-in.

Where have you been all my life?

Authenticate with your device instead. It's secure, safe and easy to use. One-click-sign-in for personal smartphones, tablets and computers.

You respected my privacy.

Well that's refreshing.

Do you really want to know how many cat pictures your new user looked at last year? Thought not.

screenshot of confirm sign in with Kno on an iphone

Signing in with Kno

Kno offers two passwordless ways for users to sign in. They can either authenticate using their email address or their device. No app required.

Users already on Kno can create an account with a single click. Reducing friction, and improving conversion.

Try it yourself at

HTML code sample showing using Kno

Quick development

Implement Kno in just five lines of code.

Kno was made with developer productivity in mind.

Getting started guide

Built with development agencies in mind

Always secure and up to date

Maintenance and security patching are all taken care of keeping you and your users secure.

Ready Made Sign In Designs

Stand out from the crowd with one of our stylish sign in templates.

Supporting Your Brand

Use our whitelabelled integration to blend Kno auth into your application.

Simple Pricing

Confidently estimate for implementing Kno onto a customer's website.

Reconnect with your long lost users

64% of signups are abandoned. Kno helps user conversion, engagement and retention by making sign in simpler.

social growth as a vector illustration

Grow with us

We are always refining. Use Kno and depend upon a robust modern authentication flow.

Let us manage the nitty gritty so you never have to.

screenshot of new sign in using magic link or QR code on iphone

New user or new device?

No trouble, we can offer the right fallback process.

Kno offers an email flow fallback using magic links. Or use the QR scan for secure authentication via an existing device.

access server computing as a vector illustration

Enhanced device security

Kno verifies the digital signature of each device. Use our trusted devices API to:

  • Protect internal tools from phishing by linking workstations and personal devices.
  • Approve customer devices against your own additional security checks.

Enterprise tier - Get in touch



0 Per month
  • 100 users
  • For small projects
  • Forever free
  • Kno branding


29 Per month
  • 1,000 users
  • One-click sign in
  • Instant account creation
  • Email backup auth


119 Per month
  • 10,000 users
  • 10 sites
  • Custom branding
  • Action confirmation

Get in touch

We are always pleased to get your email.