Polar Scope Align Pro

Polar Scope Align Pro is more than a polar alignment tool—it's a comprehensive astronomy toolkit. It calculates the precise position of Polaris or Sigma Octantis for any date and location, corrects for atmospheric refraction and other effects, and supports a wide reticle library to match your polar scope. The app also includes a Location Manager, night/day UI options, and calibration tools to boost accuracy across a range of mounts.

In addition to alignment, the app offers a 22,000+ object DSO database, solar eclipse calculator, sky weather (Xasteria data), ISS passes, and 30+ observing and imaging calculators. It can connect to iOptron mounts over WiFi, supports a Sun shadow calibration, and provides free updates forever with donations optional.