Daytime Alignment now lets you calibrate by aiming your camera at the sun, a planet or a star. More accurate than the phone compass, immune to magnetic interference.
Polar Scope Align Pro is a complete toolkit for amateur astronomers: accurate polar alignment, deep-sky observing, astro weather, push-to/manual GoTo, iOptron mount WiFi control, widgets and more. All features and updates are free forever. Optional in-app purchases are just tips to support development.
POLAR ALIGNMENT
• Calculates Polaris or σ Octantis position for 30+ reticle types: iOptron, Astro-Physics, Takahashi, Skywatcher, Vixen, Celestron, Orion, Astrotrac and others*
• Atmospheric refraction correction for accuracy at any latitude
• Works with or without a polar scope
ALIGNMENT WITHOUT A POLAR SCOPE
• Daytime / No Polar Scope Alignment: works day and night with just your phone's gyro
• Camera Azimuth Calibration: use sun/moon/stars to calibrate gyro and align accurately without a compass, immune to magnetic interference
• Laser / Hop Align: nighttime alignment for maximum accuracy with a laser or a scope with no view of Polaris
• Live sky map guides you to the celestial pole in real time
PUSH TO (MANUAL GOTO)
• Attach your phone to any scope and convert it to manual/push GoTo
• Select from a large database and use direct push or more accurate hop-to mode
DEEP SKY OBJECT DATABASE
• 22,000+ objects with altitude graphs, rise/set times and more info
• Save and manage curated observing lists
• Filter, search, sort and push to any target
XASTERIA ASTRO WEATHER
• Hourly astronomy forecasts (7Timer, OpenWeather, MET Norway, Apple Weather)
• Aurora forecasts
• ISS and bright satellite pass predictions with sky chart
• Light pollution maps, satellite imagery and more
CALCULATORS & TOOLS
• 30+ calculators for observing and astrophotography
• Moon phase calendar with altitude graphs
• Solar eclipse calculator and simulator
• Bubble level & Compass
IOPTRON WIFI MOUNT CONTROL
• Connect to iOptron WiFi mounts
• Automatic date/time/location setup
• Directional control and GoTo via the DSO Database
• Sync to target
NIGHT-FRIENDLY
• Red, green or white night mode with dimmer
WIDGETS
• Tonight's weather, satellite passes and aurora forecast
APPLE WATCH COMPANION APP
• Graphic & text display of polar alignment
• Weather view
• Bubble level
• Day alignment & push/hop-to assist
• Moon/Sun rise/set/twilight/phase
* Full list of supported reticles:
Astro-Physics RAPAS & PASILL, iOptron, the latest Orion / Skywatcher, the Classic Skywatcher / Orion / Celestron / Meade / EXOS2 / Bresser / MSM, various versions of Takahashi EM-10/11/200/400/500, NJP, PM-1, P2-Z, the Telrad, Rigel QuikFinder, a couple for Astrotrac / Losmandy / Kenko / Avalon, the Vixen PF-L/Atlux/SX/SXD/SXP/AXD/GP/GP-DX/Polarie Polar Axis Scopes, a Konus and several Polar Finders: Tuthill, Explore Scientific 8x50, Meade 9x60, Vixen Polaris, Celestron 7x50, Carton Optical. PoleMaster help view for South Hemisphere users.
Absolutely brilliant app. Makes polar alignment of my equatorial mount an absolute doddle compared to what it used to be. The developer is very helpful too, I had made my own polar scope using low cost lenses and reticle from eBay. I enquired about adding my reticle and a couple of weeks later it was included but with extra features I hadn’t even considered. Stop struggling with the ( vague ) instructions from your telescope mount manual and get this app, I guarantee you won’t regret it. You can even use the daytime alignment feature to get your mount a hairs width from perfection while waiting for nightfall. And there’s a host of other tools.
All you need for polar alignments
Norfolk Traveller
This is a brilliant app that simply and effortlessly tells me all I need to know to get a great polar alignment. Astrophotography is a hobby that will kick you in the nuts at every opportunity and, frankly, is for saddists. This one blessed little app is about the only thing that never lets me down. Meantime, here comes the clouds, wind, rain, moon, stuck adaptors, focussing issues, USB failures, neighbours that install spotlights, and random bits of dust that appear in your imaging chain and take just enough time to find as it takes to cloud over... great app tho :)
An essential tool for astronomy
Dan98765
Let’s be honest, this is not a mainstream application. It’s a tool for those people who like the stars, own a telescope/mount and what to accurately calibrate it before beginning a visual or photography session. And for that purpose it is the best application you could wish for. The other features are very useful too such as the dso catalogue and coordinates. But the alignment tool is what makes this app number one on my list of apps to check before starting an imaging session. Get it. It’s an essential tool.
An outstanding app for any astronomer
onebravodelta
I have been using the pro version of this app for several years now and I have to say that it is by far the best app for astronomy.The attention to detail incorporated is unbelievable.A few years ago I asked if the polarscope for the Astrotrac could be added, lo and behold I was testing that new version within just weeks of my request.The functions available are too numerous to mention and of course I cannot speak about accuracy of other polar scopes but for my needs this app has proven to be by far the best.I have another function I would like to discuss with the developer and I’m sure he will listen to this suggestion as he did the last.All in all an outstanding application.David HoldawayAmateur astronomer/ Astrophotographer
Version 7 brings improved daytime alignment and many more tools and features:
• Camera Azimuth Calibration added for Daytime / No Polar Scope alignment, using the Sun, Moon, planets or bright stars for higher accuracy instead of relying on the compass.
• Improved Daytime Alignment, Laser / Hop Align, and Push To compass/magnetometer handling.
• Phone mounting orientation options added for alignment and Push To tools.
• Sky maps added to Push To, Hop To, Laser / Hop Align, and Daytime Alignment.
• DSO Database lists can be saved, edited by swiping, and printed.
• Xasteria updates: Widgets available (weather, satellite pass and aurora), OpenWeather forecast, aurora forecast map, improved weather display with sun/moon altitude arcs, in-app satellite trajectories, and updated light pollution map.
• Bubble Level adds incline/slope percentage mode and Camera Az calibration support.
• Auto Night Mode added.
• New onboarding screens and improved help, especially for daytime calibration.
• Magnetic declination calculation restored.
• Various small fixes, including settings screen and iOS 26 compatibility updates.
Remember, the app never nags you with popups, so it gets very few ratings/reviews. Support it by rating it!
Version 7.0
The developer, Dimitrios Kechagias, 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 Linked to You
The following data may be collected but it is not linked to your identity:
Usage Data
Privacy practices may vary based, for example, on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
