App: ScalaVista
Developer: Aaron Hunt
Genres: Music, Entertainment

ScalaVista gives you database access to the continually expanding Scala tuning archive (over 4000 scales). 

With ScalaVista you can also send scales directly to microsynth (also available on the Mac App Store) as well as other H-Pi Instruments software. 

Here is a short list of some other basic features:

+ Browse and search the Scala file archive*
+ listen to tones and scales
    - instrument selection
    -pitches or intervals
    - movable tonic
    - duration control
    - ascending & descending
+ sort scales by name, description, tone count, tones, and creation date
+ search for matching and comparative data, including + advanced searching for multiple conditions
+ edit existing scales
+ keep your archive in sync with the online archive

The world of tuning offers countless riches yet to be discovered. Feeling adventurous?

Release notes:
updated database to current Scala archive (over 5000 scales)
updated internet protocols for bug reporting