AstroAid is an app for amateur astronomers that functions as an aid to visualizing what you will see through your telescope/camera lens when you use a particular eyepiece and, optionally, an optical aid (such as a Barlow lens). You can also pair a camera/imager with a telescope and determine what your camera/imager will see in its frame. This will be a big help for astro-imagers.

The app computes a number of parameters for your telescope/eyepiece/imager combination, such as magnification, actual field of view, visual magnitude limit, etc. and displays these values in tabular form.

Several astronomical catalogues are built in to the app (including Messier, NGC, IC, and many other object catalogues), and will be updated on-line occasionally. Images for these objects can be downloaded. All catalogues can be searched.

The app contains extensive lists of known vendor-supplied telescopes, camera lenses, eyepieces, imagers, and optical aids. You can also create your own custom entries if your equipment isn't listed (for example, if you made your own telescope). These custom entries are shared between your devices via iCloud (if available).

What’s New

Version 3.5.1

- minor bug fixes for iOS 10 users

Ratings and Reviews

zjazzymike ,

Amazing and helpful app, needs update

After 12.1 the app starts then crashes. Once updated back to my default aid app!

LMadia ,

As good as expected

It appears there is not much demand for an app such as this: one that lets the user list his equipment owned; oculars, scopes, and other accessories. Than let the user select the desired equipment and apply that combo to a very inclusive list of the various objects in observable in the night sky from the users location. I’m fact this is the only app of which I am aware that is able to perform that function. In fact, I could not find one of a simpler type, that would only allow the user list equipment; oculars, scopes, etc., how they interacted with each other, ignoring the object observed.

Since this is the only game in town one would expect to see a compromised program. Why go to extremes when a mediocre job will do? But to the credit of the developer concerning this app, that’s not the case. This is a very good program.

One can pick out the equipment owned from the provided list and for anything that is not listed under the owned section, a convenient “custom” section is included where one can list specific equipment and their stats. Once this information is provided you only need to pick out an object, and list the equipment you intend to use, (plus some other variables) and you are provided with a decent representation of the object.

Not that this app is without flaws. It can be a problem adding and or editing equipment. And if you make a mistake in selection, it can be a problem to correct. I have often found it easier to close and reopen the app, starting the process over from the beginning than labor through changes after I have entered errant information.

None the less those complaints are minor, especially when compared to what you get.

This is a good app for any amateur astronomer who wants to stay organized.

South Star ,

Amateur Astronomer's friend

This is a wonderful aid for amateur astronomers. Does all those calculations you would normally need for a night of observing or imaging. The latest updates have been especially helpful!


iLanga, Inc.
130.2 MB
Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2017-18 iLanga, Inc.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.