The 2.0.2 version of alphaN for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application is an intellectual property of Marley Watkins. AlphaN for Mac lies within Education Tools, more precisely Teaching Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
alphaN is a free-to-use standalone Macintosh Universal program that estimates the sample size needed for a specified coefficient alpha, given the Type I error rate and effect size. It estimates the sample size needed for testing an hypothesis regarding coefficient alpha with desired power.
You may want to check out more Mac applications, such as eduMap, FRS Clocks and Time or Jers Flash Card Viewer, which might be related to alphaN.