Alexa Rank is an iOS extension that let you check the Alexa ranking from any website directly from Safari or any other app that supports URL extensions.
In the app itself, you can also get the ranking of a website by typing it in a text field.
You can also see the complete stats offered from Alexa by tapping the "Complete stats" button.
PS.: The app is not endorsed by or affiliated with Alexa Internet, Inc.
Email support is email@example.com