Moon Theory

Moon phases, private & offline

Only for iPhone

$1.99 · Designed for iPhone. Not verified for macOS.

iPhone

See exactly where the Moon is tonight — phase, illumination, and moonrise/moonset for your spot. Fully offline and private; your location never leaves the phone. Moon Theory is a beautifully simple, fully private moon companion. Everything is computed right on your device — no account, no sign-in, no servers, and nothing about you ever leaves your phone. Open it tonight to see exactly where the Moon is in its cycle: a live illuminated glyph, the precise illumination percentage, the current phase name, and tonight's moonrise and moonset for your location. Countdowns show exactly how long until the next new and full moon. FEATURES • Today — a large, live moon glyph drawn from the real illuminated fraction, plus illumination %, phase name, and today's moonrise and moonset in your local time. • Tonight — an at-a-glance look at what the sky is doing tonight. • Calendar — a month grid with a phase glyph on every day; new, quarter, and full days are marked. Tap any day for its phase and rise/set times. • Reminders — optional local notifications for the moments that matter: New, First Quarter, Full, and Last Quarter, each with your own lead time. • Your location, your way — use GPS or enter coordinates by hand. • 12- or 24-hour time. PRIVATE BY DESIGN Moon Theory works entirely offline after your first location fix. There is no backend and no network call in the core app. Your coordinates are used only on your device to compute moon times — never transmitted, never stored remotely, never shared. No analytics. No tracking. No ads. Whether you're planning a night hike, chasing the full moon, or just love knowing what the sky is doing, Moon Theory keeps the Moon at your fingertips — quietly, accurately, and privately.

Ratings & Reviews

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The developer, Jared Landt, 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.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Jared Landt
    Size
    • 30.2 MB
    Category
    • Weather
    Compatibility
    Requires iOS 15.1 or later.
    • iPhone
      Requires iOS 15.1 or later.
    • iPod touch
      Requires iOS 15.1 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 Jared Landt
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.