Arrebol: Golden Hour
Sunset Forecast & Blue Hour
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Will the sky light up tonight? A sunset forecast from the clouds, golden and blue hour to the minute, and eclipses, meteors and aurora for every place you shoot.
Arrebol (Spanish): the red glow of clouds lit by the rising or setting sun. Arrebol shows you the sky before you head out: when the light turns gold, and whether the clouds will catch it.
A LIVING SKY
• The sky on screen is rendered from the forecast: tonight's clouds, lit by the sun where it will be
• The sun's whole day as one curve. Drag the time ruler and watch the light change
• Golden hour and blue hour marked on the curve, with a countdown to the next one
WILL THE SKY LIGHT UP?
• A sky score for every golden hour, from high, mid and low cloud, rain and haze
• Plain reasons, like "high cloud to catch the colour" or "low cloud may block the sun"
• The next 24 hours of cloud and the next 10 days at a glance
EVERY PLACE, ONE SWIPE APART
• Your location first, then the spots you save. Swipe between them
• Swipe up for the whole day: blue and golden hour, sunrise, sunset, moonrise and moonset with directions, and the next 14 days
• Search cities, landmarks or coordinates, and see each place's local time
PLAN THE SHOT
• Sun & moon map: bearing lines from any vantage point and the day's sun path
• Sky path chart, and a camera view that draws the path over the real sky
• Add any window to your calendar
SKY EVENTS FOR EACH PLACE
• Solar and lunar eclipses to 2040, with coverage and contact times where you are, and directions to the path of totality
• Meteor showers with the rate you can expect on the peak night
• Live aurora outlook from NOAA space weather
ALWAYS AT HAND
• Alerts before golden or blue hour, optionally only when the sky looks good
• Live Activity countdown on the Lock Screen and in the Dynamic Island
• Home Screen and Lock Screen widgets, and an Apple Watch app
Accurate: sun and moon times are checked against the US Naval Observatory, and eclipses against NASA.
Weather data from Apple Weather. Space weather from NOAA SWPC. Eclipse predictions by Fred Espenak, NASA GSFC.
Ratings & Reviews
Horizon Hours is now Arrebol.
• A living sky: see tonight's forecast clouds lit by the setting sun
• The sun's day as one curve: drag through time and watch the light change
• Every place is a page: swipe between them, swipe up for the details
• The sky score now tells you why tonight may or may not glow
• Sky events for each place: eclipses, meteor showers and aurora
• Smoother, calmer and easier on the battery
The developer, Jiawen Sun, 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
- Jiawen Sun
- Size
- 2.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
English and 3 more
- English, German, Simplified Chinese, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Jiawen Sun