Free. All versions average rating: 2.5 stars Designed for iPhone, iPad
Though it has room for improvement, Toggl Timer (available as a free app as well as free cloud service) is the best time-tracking software I’ve used. The iOS app has always been easy to use, and a recent update has further refined the interface as well as delivered an iPad-native version. Toggl Timer syncs your information to the cloud from your iPhone, iPad, or the free desktop Toggl app, but you can still use it offline. Additional features, such as the ability to assign billing rates to clients and export to Quickbooks, require a $5 monthly account. My only complaints: You must log into Toggl.com to create and export reports, and neither the app nor the web site lets you generate invoices based.