MessierGenius (formerly Messier Marathon Nerd Maker) is free to use: live sky map, FIND-mode arrows, all 110 Messier objects with real images, fun-fact quizzes, the Marathon checklist, and photo plate solving. MessierGenius Pro takes it to the eyepiece:

• Eyepiece mode: hold your phone to your telescope eyepiece; Pro matches the narrow view against 55,000 fainter stars, handles star-diagonal mirroring and straight-through flips, and labels the object you're looking at.
• Night Sky Camera: real 1–4 second long exposures with manual ISO, focus locked at infinity, and frame stacking to cut noise, sent straight to the star matcher.

After purchase you'll receive an unlock code by email; enter it in the app under "Unlock Pro" → "Enter unlock code". One-time purchase. Works offline, no account, no subscription. Android only.

Want more Messiers in your eyepiece? Browse our telescopes or call our experts at 888-471-9991. Buy a telescope from us and ask about getting Pro free.