Built for iPhone Duo
Subby follows the fold. Open iPhone Duo and the subscription tracker spreads Home and Insights across both panels; fold it shut and the outer panel shows a compact Home. It is the same app you would run on any iPhone, with the same list and the same PRO.
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Open wide, Home splits in two
Unfold the Duo and Home splits at the crease. One side holds your total and anything that needs attention, such as a trial about to end or an overdue charge. The other holds the next payments and the recent ones, and you mark a payment paid right there.
Insights across the whole display
Insights uses both panels for its charts. Overview puts this month on one side and where the money goes on the other. Trends puts the twelve month trend and the next twelve months on one side, and price creep and the forecast on the other. Services and Signals keep the list on one side and the detail beside it.
The renewal heatmap runs across the full width, and the crease becomes the gutter between two months.
Subscriptions as a list and a detail
Open the Subscriptions tab on the inner display and the list stays on one side while the subscription you tap opens on the other, with its payments on that side too. Tap another one and only the detail changes.
Nothing on the fold when you open it tall
Turn the open Duo upright and nothing sits on the fold. Home keeps two columns, your total and the trial card in one and the next payments in the other, and the tab bar stays at the bottom, where it is on any iPhone.
The phone layout on the outer panel
Fold it shut and the outer panel runs the layout you know from any iPhone, with a compact Home that you can read and use one handed. The tab bar moves into a strip at the side, next to the camera.
Every fold keeps your place
Folding and unfolding resizes the window Subby is already in, so nothing restarts. The tab you were on, the subscription you had open and how far you had scrolled are all still there after you open or close the Duo.
Liquid Glass is the Duo look
On iPhone Duo, Subby always uses Liquid Glass. The Interface style option that switches other iPhones to Material is not in the Duo's Settings. The light theme and the true black dark theme are both there.
Three questions about the Duo
Does Subby work on iPhone Duo in every pose?
Yes. Open wide, Home, Insights and Subscriptions use both panels. Open tall, Home keeps two columns with nothing on the fold. Closed, the outer panel runs the phone layout. Half folded, Subby lays out the same as in the flat pose it came from.
Is the Duo layout a different app?
No. It is the same Subby from the App Store. If you set the Duo up as a new phone, Restore Purchases brings PRO back and your backup brings the list back.
Does the list move to Android?
Yes, through a backup to your own Google Drive, which PRO runs daily, weekly or monthly. Restore it on an Android phone signed in to the same Drive account. The PRO unlock stays with the App Store, so on Android it is a separate purchase on Google Play.
Works on
Android phones Android 11 or later, with Material and a resizable widget. 
iPhone iOS 18.6 or later, with Liquid Glass on iOS 26 or Material. iPhone Duo, open Home and Insights across both panels. iPhone Duo, closed A compact Home on the outer panel.
- With PRO, your list moves between iPhone and Android through a backup to your own Google Drive.
- PRO stays with the store that sold it.
Know exactly where your money goes.
Free · No account · No bank login