CheckMark has moved! The new checkmark is at https://alchemyfor.me/checkmark
You will have to recreate your home screen icon. Remeber to update any bookmarks you have on your desktop as well.
Don't have an account? Make one for free. It takes 30 seconds. You can join here.
Bookmark the checkmark page directly:
https://www.alchemyfor.me/checkmark/
To make this an App on your iPhone:
1. Log in above. Once you log in you will see the address bar.
2. Click on the share icon.
3. Save to your Home Screen.
4. Now when you use the icon to go to Checkmark...
you will see the App full screen.
NOTE! Note that you CANNOT save it to your home screen once the address bar vanishes.