New app by Christian Beer to compose and upload descriptions for iOS and OS X apps from your Mac to iTunes Connect.

Managing screenshots with drag & drop. Updating localizations without waiting for page loads. Add sale price intervals via a convenient date picker.

Jack uses the iTunes Connect Transporter tool to communicate with Apple’s backend, storing credentials securely in the OS X Keychain. If you’re a developer, Jack makes it easy to add and edit metadata for localization purposes, select pricing tiers, and manage screenshots with drag & drop from the Finder.

There are some limitations, but overall Jack looks like a handy utility to save time when managing app metadata in iTunes Connect. There’s a free trial (limited to 10 days and 2 uploads), and the app is 40% off until the end of April.