Lunaday: Moon Phase Calendar
Stargazing, tides & widgets
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Partial solar eclipse on Aug 12 — total over Greenland, Iceland and Spain — with the Perseids peaking the same night. Lunaday shows your dark-sky window.
Lunaday shows tonight's moon phase, when the moon rises and sets, and the hours the sky is genuinely dark - then puts your plans on the calendar beside it.
Every number is computed on your device from real astronomy. No horoscopes, no predictions, no account.
TONIGHT AT A GLANCE
- The real moon phase and % illuminated, drawn accurately for the date.
- Moonrise and moonset, sunset and astronomical twilight.
- Tonight's dark-sky window: the hours with no sun and no moon.
PLAN BY THE SKY
- Sky Planner (Lunaday+): a 30-day timeline that scores the best nights for what you do - stargazing on the darkest, moonless nights; bright-moon evening hikes; moonrise-at-sunset photography.
- Sky events: named full moons, meteor-shower peaks and eclipses. The next three are free; a full year comes with Lunaday+.
- Full moons, new moons and eclipses are badged directly on the month grid.
- Tap any day to jump there and add an event.
- Natural language: type "stargaze on the next new moon" and Lunaday finds the date.
WIDGETS
- Home Screen and Lock Screen widgets showing the current phase, illumination, and a countdown to the next new or full moon.
TIDES (WORLDWIDE, OFFLINE)
- High and low water for 3,100+ tide gauges in 116 countries, computed on your device from published harmonic constants - no signal required.
- In the United States, Lunaday shows NOAA's official published predictions instead.
- Live wave height, period and water temperature from the nearest NOAA buoy (Lunaday+, U.S. waters only).
- Tides need a gauge near you. The card always names the gauge and how far away it is, and computed times are planner-grade, not a navigation tide table.
HONEST BY DESIGN
- Lunaday leads with real, on-device astronomy. Optional traditional almanac notes - like full-moon folk names - are clearly labeled as folklore, not science.
PRIVATE BY DEFAULT
- No accounts, no tracking, no analytics. Your calendar stays on your device. The network is used only to fetch public NOAA tide and buoy data, and to turn your location into a place name.
LUNADAY+
Lunaday+ is a one-time purchase - yours forever, no subscription. It unlocks the full 30-day Sky Planner, a year of sky events, live swell and water temperature, Siri Shortcuts, and calendar options (16 calendar systems, custom start of week).
Ratings & Reviews
Meet Lunaday’s new Moon: realistic lunar surface detail and more accurate shapes for every phase, throughout the app and widgets.
Also in this update: more reliable date selection and calendar events; manual locations now stay selected with their local time zone; improved local times in Sky Planner and tides; and corrected moonrise calculations on daylight-saving days.
The developer, michael ortiz, 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
- michael ortiz
- Size
- 15.4 MB
- Category
- Weather
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 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.
- iPhone
- Languages
English and 10 more
- English, French, German, Italian, Japanese, Korean, Simplified Chinese, Spanish, Thai, Traditional Chinese, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Lunaday+ $9.99
- Copyright
- © 2026 Michael Ortiz