Now available: AltKeyboard 2 (iOS 7)
Compatible with iOS 6
iPad not currently supported.
AltKeyboard lets you quickly and productively type non-alphabetic characters from your default keyboard view, without having to switch back & forth between iOS keyboard modes.
Simply flick up on a key to input its alternate numeric or special character (displayed at the top of the key).
Designed & Mocked-up by Sentry
Coded & Developed by Alan Yip
Configure options from Settings.
See larger Screenshots below..