iOptron Polar Scope 4+

Pole Star Assistant

Chengcheng Xu

Designed for iPad

    • 3.0 • 10 Ratings
    • $1.99



This is an app to show the position of the Pole Star (Polaris in Northern Hemisphere, or Sigma Octantis in Southern Hemisphere) in the polar scope of all the iOptron(R) telescope/camera mounts.

The app uses the best algorithm to calculate the position of Pole Star: The algorithm calculates 3D space motion of the Pole Star itself, precession, temperature and barometric pressure corrected atmospheric refraction, nutation, parallax, aberration, and etc.). The overall accuracy of the algorithm has reached sub 0.1 arc-seconds now.

The app now using a 10 minute marker reticle, the same reticle used in the polar scope of iOptron(R) telescope mount since 2014.

A must have for iOptron(R) SkyGuider Pro, iOptron(R) SkyTracker Pro, SkyGuider and SkyTracker users!
Also very helpful for any iOptron(R) telescope mount owners. It may also be used with other brand telescope/camera mounts with similar polar scope reticle.

No human interaction required when iOS devices can using location service normally.
iOS users can manually enter the location when location service is unavailable.

What’s New

Version 8.12

Now display 2 more decimal digits in longitude and latitude.

Ratings and Reviews

3.0 out of 5
10 Ratings

10 Ratings

Astronewb ,


Very nice app for iOtpron EQ mount owners, it would be nicer is the date actually worked correctly?
The date is a year off...the month is off by a month..and the day is off. The actual info on Polaris seems to be correct.

Stucko100 ,

Not American English

The elevation is in metric not much help in the USA. If it can be converted to Chinese why not USA measurements? I’m not knocking metric but I’ve spent 60 years using feet ,miles and Fahrenheit. So only half of this app is of any use for me. It’s only good for alignment I should have paid better attention and not assumed it was for the US market. I can use it but I won’t have a clue about my elevation.

Physics2 ,

Do not buy - very weak functionality

It tells you where Polaris is located for your current time and location. But with no options or way to configure the display (other than English / Chinese). Other apps do this as well but with plenty of options for customization. It might be OK if it were free, but it is dismal at $1.99.

App Privacy

The developer, Chengcheng Xu, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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