Polar app has been designed carefully and beautifully. It's by far the best mobile sign up form I have experienced. The form is simple, immediate, easy to use, no scrolling, infield labels facilitate ...
![Best mobile sign-up form](https://cdn-ak-scissors.b.st-hatena.com/image/square/fd98767a3e257069e9a83edd8d65c6607989ebc9/height=288;version=1;width=512/https%3A%2F%2Fcdn1.evernote.com%2Fevernote.com%2Fimg%2Fsocial-meta%2Fshared-note-thumbnail.png)
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