The company claims to be the first iPhone developer to do so, debuting a range of seven titles by international children's authors Steve Skidmore and Steve Barlow.
Titles include Vernon Bright and the Magentic Banana, Vernon Bright and Frankenstein's Hamster, Vernon Bright and the Faster-Than-Light Show and Vernon Bright and the End of the World, which hopefully has an happy ending.
Authors Skidmore and Barlow made the titles available from books which were no longer in print and the rights had reverted back from the publishers. Titles from additional authors are planned in the near future the company says.
A quiz game is included with each eBook to help attract younger readers with a little interactivity.
Available from the Sleepydog books cost £1.19 (US$1.90) each.