Below are downloads of several apps which have dropped in price and are available for a limited time from Apple's App Store. These apps are created for the iPhone and iPod touch; they're also compatible with the iPad but will run at a significantly lower resolution. (Check the individual apps for further information.) Many are at the lowest total price we've seen. The deals:

• PerfectReader Pro for 99 cents ($3 off): PDF analysis tool
• Gyro13 for 99 cents ($1 off): Helicopter action game
• Antrim Escape 3 for 99 cents ($2 off): Puzzle game
• Filtatron for 99 cents ($7 off): Audio effects suite
• AutoStitch Panorama for 99 cents ($1 off): Panorama photo assistant
• SketchBook Mobile (pictured) for 99 cents ($1 off): Art creation tool
• Dragon Fantasy for 99 cents ($2 off): Role-playing game