Let's make two-factor easy & secure. No more typing 6-digit codes. Zero touch two-factor logins on the web. Immunity to phishing.

Krypton implements the standardized FIDO Universal 2nd Factor (U2F) protocol to provide secure, unphishable two-factor authentication on the web, now in the convenient form factor that is your phone.

- Tired of typing 6-digit codes?
No more mistyping, missing 30 second windows, or waiting endlessly for that SMS.

- Instant Sign-in
Krypton securely pairs with your computer so that you don't have to touch your phone for each sign-in. Optionally, enable One tap sign-ins for enhanced security.

- Stops Phishing
SMS and authenticator app codes can easily be phished. Don't let that happen to you. Krypton protects you from phishing.

- Works with the sites you love
Google, Facebook, Twitter, Dropbox, GitHub and many more.

- Quickly protect your accounts
Setting up two-factor can be time consuming and repetitive. Just scan once with Krypton.

Get started by pairing Krypton with your browser by downloading our browser extension at:

>> Are you a developer?

Krypton supports developer mode so you can use Krypton as a security key for SSH and PGP private keys in addition to U2F.

Download our command line utility `curl | sh` and type `kr pair` to securely pair Krypton with your computer. Krypton integrates with the `ssh` command to send signature requests right to your phone. Krypton also makes signing Git commits and tags with PGP easy: run `kr codesign` to get started.

>> Unbeatable Security

Krypton is built on top of an end-to-end verified and encrypted architecture. This means zero trust. We,, have zero information about keys or where you're authenticating. The keys only live in the Krypton app on your phone.

The source code can be found at
Learn more here:

What's New

Version 2.5.4

- Support for logging into Google on Chrome iOS with Krypton
- UX Improvements

Ratings and Reviews

4.4 out of 5
24 Ratings
24 Ratings

Great App

This is an amazing idea to make U2F on a mobile device. It actually works very well and quickly. Although, how would this work for when users signing in on a mobile device? When I tested this out on Google, it automatically switched to my secondary 2FA choice. Overall, this is a great idea and it works seamlessly. My one problem is getting it to work on mobile devices.


Great alternative to BLE keys, need to address notification bug

Krypton is a great replacement for the Google/Feitian MultiPass BLE key for Google Advanced Protection Program users. It’s also a great way for users to get started with U2F.

That said. I’m having an issue that I cannot turn on notifications and Krypton isn’t showing up in IOS’s settings/notifications. I suspect an update will be needed to address this as uninstalling/rebooting/reinstalling doesn’t remedy it.

M.C. Hammer

Great app

I love the idea, and the developer support is great. I contacted them about an issue I had and received a response almost immediately (this issue was my fault, not theirs). Great UI too.


KryptCo, Inc.
55.9 MB
Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2017 KryptCo, Inc.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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