Download of iObserve 1.7.6 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
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. IObserve for Mac is included in Education Tools. This Mac app was originally developed by Soft Tenebras Lux.
From the developer:
Observe the sky like a pro.
iObserve pushes your preparation of astronomical observations to a much higher level. It gathers all the information you need when observing the sky with small and big telescopes, and let you manipulate your nights and targets. It has been built from the ground up by a former ESO support astronomer in Chile.
You may want to check out more Mac applications, such as Trapcode Particular, Calcline or Xfoil, which might be similar to iObserve.