iOculari is a "calculator" for all fans of astronomy that I developed as a hobby and leisure. Inputting a few data, as well as enabling you to check the quality of the configuration of your telescope, will also provide useful and practical tips for choosing the perfect eyepice, in a simple and understandable way.

It also provides several parameters on the performance of your equipment including:
exit pupil,
true field,
transit time,
theoretical resolution,
many other curiosities.

The more detailed descriptions of various items are meant to be an introduction for beginners and a reminder for the experts.

You can save the data of your telescopes, your eyepieces and the observers for an easy and faster consultation.

Do you want to translate iOculari in your language? Send me an email!

Remember that buying this App it's also a nice way to support all the works and free applications you find on ;)

What’s New

Version 3.61

Bug fix
Code cleanup

Ratings and Reviews

2.7 out of 5
3 Ratings

3 Ratings

South Star ,

Shows promise but...

Not at all intuitive to set up. Also, desperately needs to give the user the ability to edit the order in which the eyepieces and telescopes are listed.

With some basic documentation and some added editing ability, this quickly becomes a useful app for the astronomer who has multiple telescopes and eyepieces.

TonyTeaBags ,

A Very Utilitarian Application

The other reviewers are right; this is not all that intuitive in setup. Clear instructions are needed. However, this is a great app once you learn how to set it up. Spending the time to learn its idiosyncracies is well worth the trouble. All the optical train specifications are presented in one place for any telescope, eyepiece, and astronomer's eye. Very useful either at your desk or at the eyepiece. I recommend this application to anyone who has the patience to learn to use it.

Israel70 ,

Difficult to use

I am a beginner and was looking for a calculator to help me understand the different eye pieces on my telescope. I was hoping that this app would pull the specs of my telescope and allow me to better understand the various lenses I have. I did not get much out of this app, I hope it gets improved significantly otherwise I would say don’t buy!


Federico Romano'
18.5 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Italian

Age Rating


  • Family Sharing

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

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