The British-developed application takes advantage of Apple’s acceptance of third-party keyboards with the launch of its new mobile operating system.
SwiftKey, which allows users to type words by sliding their finger from one character to the next has been a huge hit on Android and now looks set to repeat that success on the other side of the smartphone isle.
The company is offering the app for free, while competitors like Swype are charging, meaning iOS 8 users can try out the new typing style without committing any pennies.
Meanwhile, in other iOS 8 news, the first App Bundles have hit the App Store.
Users can save money on titles like Angry Birds by obtaining four games in the series for just £1.49, while the Cut The Rope trilogy can be nabbed for £2.99.
Apple is also touting an Readdle Ultimate Productivity Bundle for £13.99, a 25 per cent saving on buying all four apps separately.
Up to ten apps can from a single developer can be placed in a bundle, all of which will be downloaded simultaneously.