See star classifications!

This application calculates the precise spectral type of a main sequence star using surface temperature. Use this astronomy app to discover all the different classes of stars from M through O. Some newer star types are included such as Y, K, and L.

• Enter a surface temperature from 250K to 60,000K.
• As you edit the temperature, the results will change in real time.
• Pictures of example stars from each spectral class.
• Learn about the MK System that defines each star class.
• View the graph that shows the distribution of star classes vs. luminosity

What’s New

Version 6.0

This app has been updated by Apple to display the Apple Watch app icon.

• Manually change the temperature for more precision
• Updated for iOS 11
• Minor bug fixes

App Privacy

The developer, Ian Annase, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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