Hour-by-hour stargazing forecasts, with the sky above the fold and the map below
Does Starglow work on iPhone Duo?
Yes, says the developer: Starglow 2.0 is optimised for iPhone Duo, with the sky on the top half and the map and time slider below when it stands like a laptop.
- Developer claimedAndrew Yates, the developer, in a submission to FoldHunt on October 23, 2026, in a post on X the same day and in the Starglow v2.0 post on the Starglow blog. The App Store seller is Andrew Yates. The release notes for version 2.0.1 (released October 24, 2026) don't mention the Duo. The website's pictures of a half-folded Duo are composites on device artwork, and its unframed captures come from an ordinary iPhone.
Adapted for the fold
- Closed · Outer display
The forecast, closed
Closed, the forecast fits the cover, with the tab bar down the side when you hold it sideways.
- Open · Inner display
The night hour by hour
Open, the hour-by-hour forecast, with cloud at every height, the Moon and the ISS, fills the inner display.
- Book · Partly folded
Sky above, map below
Stood half open like a laptop, the Map tab and Vantage Point move their controls off the fold: the sky on the top half, the map and time slider on the bottom.
About Starglow
Starglow is a stargazing forecast by Andrew Yates, for iPhone, iPad and Apple Watch. It forecasts the night hour by hour: cloud at low, middle and high altitude, the Moon’s phase and path, visible ISS passes and how dark the sky will get, with seeing and transparency for astrophotography. A Moon map and augmented-reality views show where things will rise. Starglow Pro adds five-day forecasts and, in version 2.0, a dark-site finder from satellite light-pollution data, a comparison of your saved places, Vantage Point, star-trail planning and a 3D map.
Version 2.0 is optimised for iPhone Duo, the developer says. Closed, the forecast fits the cover, with the tabs down the side in landscape; open, the hourly forecast fills the inner display; and stood half open like a laptop, Vantage Point and the map put the sky on the top half and the map and time slider on the bottom. The pictures of that pose on the website are composites, so we haven’t seen it running yet.
On X
Starglow v2.0 is out now, with support for iPhone Duo & new ways to plan your next night under the stars. Find darker skies with the new Dark Site Finder, discover the best location tonight, and explore Vantage Point, Star Trails and a 3D map with Pro. starglowapp.com/blog/starglow-…
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Is this your app?
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Sources: Starglow v2.0 Released, on the Starglow blog (starglowapp.com) · Starglow on X (x.com) · Starglow on the App Store (apps.apple.com)
More for iPhone Duo
Tide Guide
Condor Digital
Tides at a glance closed; open, charts, weather and live radar in one view
Launch partner: Named by Apple in its Newsroom article of October 22, 2026, on apps optimized for iPhone Duo. The App Store release notes for version 27.1.2 (released October 24, 2026) say: "Meet Tide Guide for iPhone Duo! Check the tide at a glance, then unfold for a closer look at charts, weather, and solunar details. An all-new map puts real-time radar alongside your tide stations."
- Closed
- Open
Please Don't Rain
Chris Wu
A weather app that brings its iPad layout to the open Duo and splits at the half-fold
Simulator verified: Chris Wu, the developer, in a submission to FoldHunt on October 16, 2026, saying it's ready for launch day, with screenshots of the app in the iPhone Duo simulator on the app's press page, on X and on Mastodon. The App Store seller is Christopher Wu (id 6444577668). The release notes for version 5.30 (released October 16, 2026) have a section on iPhone Duo support.
- Closed
- Open
- Book
SolarWatch
Fifteen Jugglers Software
A sun dial whose tiles step off the crease as you fold
Simulator verified: The developer, Engin Kurutepe, posted a video of SolarWatch's layout going from open flat to half-folded (@ekurutepe on X) and later a TestFlight build with iPhone Duo support (@ekurutepe on X).
- Open
- Book