Howler Timer is an easy to use timer application. With the free version you get the following features:

• Unlimited timers
• Fast input and start of timers, no mouse required
• Clear, resizable display
• Remembers your last set timer
• Allows you to play whatever sound file you want for the alarm
• Set a timer with an end date (alarm)
• Convert temperatures C / F, cooking volumes/weights.
• Save a timer to a preset
• Stopwatch capability

Howler Pro, which is the version available for purchase through either in-app purchase or separate purchase from the Mac App Store, has all the features of the free Howler, plus many more:

Full Screen Mode:

• Zoom the display to use the full screen
• Set Howlers to activate Full Screen Mode when started

Presets:

• Save any Howler (timer window) for quick future access via menu or key command
• Saves all Howler attributes including time, title, finishing behavior, and window position
• Allows you to automatically start presets when activated
• Preset ⌘1 may be called when Howler Pro is launched

Howler Chain:

• Chain multiple timers together; when one finishes, the next starts automatically

Finishing Options:

• Set the Howler to loop itself or start a Preset when it finishes

Silent Mode:

• Set Howler Pro to run silently without muting the system volume

Stopwatch:

• Set a Howler to run as a Stopwatch (counts up instead of down)