The Bike Doctor app is like having a knowledgable mechanic in your pocket. All the most common bike repairs are covered in easy to follow detail. Get it now and never fear a puncture again!
The Strava app uses the iPhone GPS to track your cycling. It also compares your times to fellow cyclists in your area. It's a great motivator to ride more and ride faster!
The Bike Hub app (UK) is a TomTom for cyclists. It will get you from A to B via a cycle friendly route. Get it and you'll soon be discovering amazing routes. Oh, and it's free!
The Ride the City app covers 39 American cities providing great directions for cyclists.
The free Daylight app tells you when the sun rises and sets. Useful for anyone who is bike touring and wants to plan their day. Also good for timing your romantic sunset drinks ;)
A couchsurfing app for cyclists. Find free places that are happy to accommodate cyclists. Great for anyone who is bike touring.
Cyclemeter is another great app for tracking your cycling. It also allows you to import KML files so you can follow routes.
Mountain Bike Trails lists great places to go mountain biking.
The London Bike Rides app contains the best cycling routes in London. Grab your bike and your camera and discover London!
CoachMyRide offers training plans for cyclists. If you've got Tour de France aspirations then get this app!
If you've got your iPhone mounted to your handlebars it can be useful to record your ride in case of an accident. Witness Driving records and keeps just a set amount of video to not fill your memory.
Rouleur is a gorgeous cycling journal. It was voted consumer magazine of the year by BikeBiz. Buy a copy and feed your love of cycling.
You'll get the most out of your iPhone for cycling if you use an iPhone bike mount. Checkout my other guide for tips on the best ones.