LeagueLog: Observing Programs
Astronomical League tracker
Free · Designed for iPad. Not verified for macOS.
Every Astronomical League program offline, with an honest answer to whether tonight's attempt will work.
Every Astronomical League observing program, on the device, at the eyepiece — and an honest answer to the question that decides the night: will tonight's attempt actually work?
32 PROGRAMS, 5,696 OBJECTS, NO SIGNAL NEEDED
Object lists, completion rules, certificate thresholds and coordinator details are all stored locally. Dark sites have no signal; nothing here needs one. No account, no network requests, no location access required.
ONE OBSERVATION, EVERY CERTIFICATE IT EARNS
Log M 31 through binoculars from a city and it counts toward Messier, Binocular Messier and Urban at once. Where an observation does NOT count, the app names the rule that stopped it — a binocular program will not accept a telescope, Urban only credits light-polluted skies, and the same object under a second catalogue number is not a second observation.
WHETHER TONIGHT WILL WORK
The hours an object is both high enough and the sky is genuinely dark. Whether it is within reach of your aperture from your sky. Whether a filter will help — which, for most objects, it will not, and the app says so rather than selling you one.
ALL THE WAY TO THE CERTIFICATE
Finder charts with Telrad and finder circles at five fields of view. Star hops. The questions each program's manual actually asks. Companions inside the same field, so you catch six without moving the telescope. And a covering letter to the program coordinator when a list is finished.
BUILT FOR THE DARK
Red-light mode throughout, plus optional screen dimming that restores your brightness when you leave. Everything readable without costing you twenty minutes of dark adaptation.
THE LOGBOOK THAT CHECKS ITSELF
Import an existing logbook as CSV. The check explains, entry by entry, what earns nothing and why — and offers near-miss corrections for designations that do not exist, which you accept or ignore. Nothing is ever corrected silently.
ALSO
• Home Screen and Lock Screen widgets: when it gets dark tonight, how long the window runs, how much of it is moonless, and what is up right now
• Observing sessions with conditions, and Live Activities while a session runs
• Sketching, with full-resolution review
• Statistics, an observing-year report, and PDF or CSV export
• Master Observer progression tracking
• Full VoiceOver support, Dynamic Type, and iPad
Object lists and program rules are the Astronomical League's, included with permission. Positions are cross-checked against OpenNGC (CC BY-SA 4.0); where a published coordinate is wrong by more than a degree, the corrected position is shown and the original noted.
LeagueLog is an independent app and is not published by the Astronomical League.
Ratings & Reviews
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The developer, Yiwen Luo, 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 Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yiwen Luo
- Size
- 7.7 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Yiwen Luo