Please note that the only in-app purchases available are tips. All functionality is included.

Polar Scope Align will calculate the position of Polaris or σ Octantis in your Polar Scope reticle for your location (using your phone's GPS or entering a location), allowing a quick and accurate polar alignment. It is one of the few programs that are accurate in lower latitudes by correcting for atmospheric refraction (so expect results to agree only with precise software and not most simplistic "polar align" apps - see the "Accuracy" section in the website for details). It will even allow you to measure and correct a centering error of the reticle - very useful for polar scopes that are not easy to adjust (e.g. iOptron ZEQ25). In the settings you can also select from a collection of reticles, one that matches your own - currently iOptron, Astro-Physics, Takahashi, Orion, Skywatcher, Celestron, Meade, Vixen, Astrotrac, Losmandy, Kenko, Avalon Instruments, Tuthill, Telrad reticles are available. Feel free to contact the developer with any questions, feature requests, extra reticle requests and any problems you have with the app. If you like Polar Scope Align, please consider leaving a review on the app store.

Feature list:

-Accurate calculation of Polaris or Sigma Oct for any date and location, including effect of atmospheric refraction (and annual aberration, nutation).
-Use device time/date and GPS location, or manually enter your own.
-Location manager with favorite locations, list of recent locations, online search and offline world database (cities/towns of at least 1000 population).
-Supports a multitude of polar scopes: iOptron, Astro-Physics RAPAS, various versions of Takahashi EM-10/11/200/400/500, NJP, PM-1, P2-Z, the latest Orion / Skywatcher, the Classic Skywatcher / Orion / Celestron / Meade, the Telrad, a couple for Astrotrac / Losmandy / Kenko / Avalon, the Tuthill Precision Polar Finder, the Meade 9x60 Polar Viewfinder and the Vixen Polaris and SX/SXD/SXP/AXD/GP/GP-DX/Polarie Polar Axis Scopes.
-Full app in red-color night mode - tools switchable to non night mode view.
-Moon phase & lunar Calendar with solar/lunar rise/set and twilight times.
-Wizard to calculate your reticle centering offset and correct or compensate for it.
-Zoomable reticle view.
-Alt-az alignment error display for mounts that calculate it after star alignment (e.g. iOptron iEQ45, CEM60).
-Polar alignment when your scope is not in zero position (for mounts like iOptron ZEQ/CEM on which you can always access the polar scope).
-Remember zero position on Celestron / Skywatcher / Orion etc reticles.
-Approximate daytime / no polarscope polar alignment tool. Great for solar imaging (including eclipses).
-Bubble level (using either gyro or accelerometer) and Compass heading, as well as magnetic declination reading.
-GPS accuracy & elevation data.
-Red/White/LED light.
-Dimming slider.
-Deep Space Object Database with 13000+ objects from several catalogs (Messier, Caldwell, NGC, IC, Herschell 400, Sharpless 2). The database is searchable and fully configurable with filters, various sorting methods etc.
-Over 25 calculators useful for observing and astrophotography, from eyepiece magnification and field of view, to imaging resolution and reducers.
-Xasteria: World astro-weather report based on 7Timer! data.
-Access to the latest water vapor satellite images.
-List of visible ISS passes and Iridium flares.
-iOptron, NexStar and Meade LX200 Star Lists.
-Support for iPhone & iPad from iOS 6.

There is also a free ad-supported version that offers the base functionality but lacks extra features.

From version 3.5, an upgrade of the app to a new version will anonymously share the iOS version, reticle and tools used, so that I can focus development appropriately. The main reason for this is that while I intend to keep support for iOS 6/7 devices for as long as I am allowed, even for very few users, it adds an overhead so I should make sure it is really needed.

What's New

Version 3.8

Polar Scope Align never nags you with popups about a rating/review, but please do take a moment to rate new versions which bring more features, as the star rating resets. There is a link to ratings in the settings page if it helps.
What's new:

- Added rise/set times of objects in DSODB.
- Fixed superimposed Select/Cancel buttons.
- Fixed disappearing copy popup in help.

Ratings and Reviews

5 out of 5

32 Ratings

32 Ratings

New to Alignment


Just recently downloaded this app. Haven't yet had a clear night to use it with my new SkyGuider Pro. But I'm extremely impressed with its many features and functions. Many thanks to the author for a truly valuable app.

It just keeps getting better. Has all you need (except patience) to get a good polar alignment.

Simply the best, and keeps getting better


Although I have not tried every polar alignment app, I have used a half dozen. When I found Polar Scope Align Pro, it had the accuracy and flexibility I was looking for. That was two years ago and it just keeps getting better. Definitely a five star app from my experience!



This is a fantastic app that does the job well. New, useful features are added as time goes by, and I've never had any issue related to this app. I would buy this again without hesitation and highly recommend this app. Many thanks to the developer for creating and maintaining it.


Dimitrios Kechagias
29.3 MB
Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2016 D Kechagias
In-App Purchases
  1. Tip 10x $9.99
  2. Tip 1x $0.99
  3. Tip 4x $3.99


  • Family Sharing

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

More By This Developer

You May Also Like