MessierGenius
by Orange County Telescope
Find, photograph and really learn all 110 Messier objects. Your Messier Marathon companion.
▶ Get it on Google Play ⭐ Unlock Pro – $4.99
Android · Google Play listing coming soon · Red night mode protects your dark-adapted eyes.
See it in action
Free vs Pro
| Feature | Free | Pro |
|---|---|---|
| Live sky map from your location | ✅ | ✅ |
| Search all 110 by number, name or nickname | ✅ | ✅ |
| FIND mode: follow arrows, phone buzzes on target | ✅ | ✅ |
| "You found it!" cards & quizzes | ✅ | ✅ |
| Messier Marathon checklist | ✅ | ✅ |
| Label Messier objects in your night-sky photo (offline) | ✅ | ✅ |
| Eyepiece mode: matches 55,000 fainter stars, handles diagonal mirroring | – | ✅ |
| Night Sky Camera: 1–4 s exposures, manual ISO, stacking | – | ✅ |
🎁 Free with a telescope
Buy a telescope from octelescope.com and ask about getting Pro free.
Learn the Messier sky
🏃 Messier Marathon 2027
Best dates, the order and how to plan the night.
📋 All 110 Messier objects
Type, constellation and brightness for every object.
🔭 Best telescope for Messier objects
What aperture and mount you really need.
🌌 Finding galaxies & nebulae
A beginner's guide to your first faint fuzzies.
FAQ
Is MessierGenius free?
Yes. The sky map, search, FIND mode, fun-fact cards, quizzes, Marathon checklist and photo labeling are free. Pro adds eyepiece mode and the Night Sky Camera.
How do I get MessierGenius Pro?
Buy a Pro unlock code at octelescope.com ($4.99, or $7.99 bundled with Lunar CraterFinder Pro) and enter it in the app under Unlock Pro. No account or subscription. Buy a telescope from Orange County Telescope and ask about getting Pro free.
Does MessierGenius track me?
No ads, no tracking, no account. Location, photos and camera are processed on your phone.
What phones does it run on?
Android 7.0 or newer. iPhone is coming later.