Character Pad is a free iPhone app developed by Armchair Engineering. It provides users with quick access to hundreds of beautiful and useful special characters that can be used in any application. With just a tap, users can copy a character to their device's clipboard, open any other app, and paste it wherever needed.

This app is perfect for customizing instant messages, emails, documents, and other texts with a great selection of special characters and symbols. The character library includes the Greek alphabet, numbers, math symbols, bullets, letterlike symbols, and many more.

Two App Store reviewers have praised Character Pad for its ease of use and seamless functionality. One reviewer, Soxcat, said it was "dead easy to use and works a treat!" Another reviewer, Auntmarge64, described it as fast, simple, and worth the dollar.

Please note that the characters in Character Pad are readable from any iPad, iPhone, iPod Touch, Mac, and most PCs. However, some special characters may appear as question marks (?) or squares for recipients of text messages using non-iPhone mobiles.