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), allowing a quick and accurate polar alignment. It is one of the few programs that are accurate even 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). It will even allow you to 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.

Main features:

-Accurate Polaris / σ Oct position calculation, including atmospheric refraction, stellar aberration, nutation.
-Automatic Time/Location.
-Calculation and correction/compensation for off-center reticles.
-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 SX/SXD/SXP/AXD/GP/GP-DX/Polarie Polar Axis Scopes.
-Remember zero position on Celestron / Skywatcher / Orion etc reticles.
-Full app in red-color night mode.
-Moon phase.
-Messier, Caldwell and Bright star database.
-6 calculators useful for observing and astrophotography.

This free version is ad-supported. You can also try the ad-free Pro version with the following extra features:

-Ability to manually enter time/date and location (including saving favorites, list of recent locations, loading from world location database, searching online).
-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 on which you can always access the polar scope).
-Lunar Calendar with solar/lunar rise/set and twilight times.
-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 control.
-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 20 calculators useful for observing and astrophotography, from eyepiece magnification and field of view, to imaging resolution and reducers.
-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 Named Star list, Meade LX200 star list.
-Screen dimming slider.

The app is updated regularly with new 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

4.9 out of 5

14 Ratings

14 Ratings

Best Polar Alignment App


When I found out that the recent solar eclipse was not going to be total at my observatory, I had to shoot closer to my home. I used this app to align my old C8 the night before (with no polar scope). It was so accurate that it kept the sun centered for over 5 hours. I then discovered that it had a reticle for my G11 Gemini permanently mounted at my observatory. Now it's aligned better than I was able to get by drift aligning. Works great on my iPad too. Thanks for a great and useful app. Steve Foster

By far the best app for polar alignment

Swag yolo easy money

The interface is effortless, and easy to interpret. I've very much enjoyed my time using this application for astrophotography, and recommend it to others.

Super helpful


With this app I'm able to get a much more precise polar alignment than I would just eyeballing it. This was a direct contributor to getting 1 minute subs unguided on a recent imaging session.


Dimitrios Kechagias
24.9 MB
Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2015 D Kechagias


  • Family Sharing

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

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