# iOculari - Telescope

> Astronomy calculator for telescope performance, eyepiece selection, and equipment management. (iPhone/iPad app by Federico Romano'.)

- Source: https://appshunter.io/ios/app/ioculari-telescope/id465309761 (this page in markdown: same URL + `.md`)
- Developer: [Federico Romano'](https://appshunter.io/developer/465309764)
- Category: Utilities, Education
- Price: $2.99
- Rating: 3.33/5 from 3 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 18 MB
- Languages: English, Italian
- Released: 2011-09-23
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ioculari-telescope/id465309761/reviews.md

## What is iOculari?

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:
magnifications,
power,
exit pupil,
true field,
transit time,
brightness,
magnitude,
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 http://subdimensions.com ;)

## Key features

- Telescope configuration quality check
- Eyepiece selection tips
- Performance parameter calculations
- Equipment data saving
- Observer profiles

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/ioculari-telescope/id465309761/reviews.md

### 5/5 — Updated review to 5 stars

*2022-08-01, version 3.61*

I originally gave this app 3 stars, mainly due to it not being completely intuitive to me in the beginning.  But I’ve now used the app for a few years, and really feel it deserves 5 stars.  With 9 telescopes and dozens of eyepieces (yes, I have a problem), I find the app indispensable during a viewing session.  Once you input and save (archive) telescope, eyepiece, and observer details, just choose your scope/eyepiece combination, and the app gives you magnification, field of view, exit pupil, and several other pieces of useful information.  The app is very helpful in comparing different combinations of equipment when figuring what you wish to use for observing. Give this app a shot, and you won’t be disappointed.

### 4/5 — A Very Utilitarian Application

*2020-10-13, version 3.61*

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.

### 1/5 — Difficult to use

*2018-07-15, version 3.2*

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!

## Frequently asked questions about iOculari

### What is iOculari used for?

iOculari functions as a calculator for astronomy enthusiasts. It helps users check their telescope's configuration quality, offers tips for selecting the perfect eyepiece, and calculates various performance parameters.

### What performance parameters does iOculari calculate?

iOculari calculates parameters such as magnifications, power, exit pupil, true field, transit time, brightness, magnitude, and theoretical resolution, among others.

### Can I save my telescope and eyepiece data in iOculari?

Yes, iOculari allows you to save the data for your telescopes, eyepieces, and observers for easy and faster consultation.

### Is iOculari suitable for beginners in astronomy?

Yes, the app provides detailed descriptions of various items, intended as an introduction for beginners and a reminder for experts.

### What devices does iOculari support?

iOculari is available for iPhone, iPad, iPod, and Apple Watch devices.

### How much does iOculari cost?

iOculari is a paid application, priced at $2.99.

### When was iOculari last updated?

The latest version of iOculari, version 3.61, was last updated on May 26, 2020.

### What is the user rating for iOculari?

iOculari has a user rating of 3.3 stars based on 3 ratings.

## Version history (last 1 release)

### 3.61 — 2020-05-26

Bug fix
Code cleanup

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## More apps by Federico Romano'

- [Coax Line](https://appshunter.io/ios/app/coax-line/id574303349)
- [iWSPR TX - QRP Hamradio](https://appshunter.io/ios/app/iwspr-tx-qrp-hamradio/id781433570)

All apps by Federico Romano': https://appshunter.io/developer/465309764

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*