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By Clef LLC

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Clef is a replacement for usernames and passwords and the most secure two-factor authentication available. Trusted by hundreds of thousands of everyday people all over the world, we think of ourselves as your friend in the security business.

“With Clef, logging into a site feels, admittedly, a little bit *magical*.”
-Nicole Perlroth, Cybersecurity, NYTimes

Why is Clef the best way to log in?

- No password required
Every website that integrates Clef for login is one you don’t have to remember a password for, and it’s the most secure login available.

- Unmatched usability
Clef’s interface is simple to understand. Anyone can utilize the best cryptography available without requiring any technical knowledge.

- Seamless security
Protects against more attacks than any other product other market, including Google Authenticator and Authy.

- Always free
Clef is always free for you. Websites that want the best customer account security pay for Clef, so you don’t have to.

- Log out anywhere
Forget to logout and remember in the car? No problem. With Clef, you can simply open the app on your phone and log out instantly from anywhere.


Clef offers two-factor authentication built for business.
If you are a developer or manager considering integrating Clef into your product, contact our sales team, Our engineers assist with every enterprise integration.

- Amazing plugins
We’ve built one of the most popular WordPress plugins ever (and we have great ones for Joomla, Drupal, Magento and more too). If you’re on any of these platforms, you can set up Clef on your site, free, in a couple steps.

- Integrating Clef is a snap
If you’re a developer, integration Clef in your web app is as easy as dropping in a few lines of code. Documentation is available at and we’re available for assistance at every step of the process.

We love to hear from you! If you have feedback or suggestions, send them our way! Visit for answers to popular questions or to send our engineers an email.

What's New in Version 3.6.4

Fixes a bug with mobile logins.

iPhone Screenshots

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Customer Reviews

Love it

Been using it for a few days and almost seems too good to be true. I am waiting and expecting some issue but so far it's great. I like the added sense of security. Logging in is fairly fast and I can stay logged in for a set length of time I specify including unlimited yet I can log off remotely with my phone which is nice. I use it for all my Wordpress sites and wish other companies allowed this to work with their systems.

Fast and easy.

Makes multiple website design a breeze when logging in. I have been using this for about a year now. At the moment, I am working on three or four websites. Nothing better than logging in all of them at the same time with just a fingerprint on my iPhone.

Really Great!

I still think highly of Google Authenticator and use it on sites that don't have Clef, but WOW this is a step up. I don't know why I put off trying Clef. I especially love being able to log out everywhere from my phone. I'm using this for all my WordPress sites.

View in iTunes
  • Free
  • Category: Productivity
  • Updated:
  • Version: 3.6.4
  • Size: 19.1 MB
  • Languages: English, Catalan, Czech, Danish, Dutch, French, German, Greek, Indonesian, Italian, Japanese, Korean, Norwegian Bokmål, Norwegian Nynorsk, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese, Turkish, Ukrainian, Vietnamese
  • Seller:

Compatibility: Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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