iAccel version 1.3 is now available on the App Store. This version has revised auto-levelling functionality which makes better use of the gyro data from the iPhone. This has the effect of improving considerably the response of the device to changing road gradient and pitch changes under braking and/or acceleration.
Existing users will be notified of the update via the App Store in the usual way. The free version of iAccel has a number of built in tests. For a small fee iAccel Pro adds more test types and extends the continuous recording feature from 20 seconds up to 5 minutes. Updates to the Pro version are available as an in-app purchase. For more information about iAccel see iAccel on this site