The problem
The problem: black bars
Apple says all apps still run on iPhone Duo. But an app that isn't yet optimised for iPhone Duo can appear as a narrow column on the open screen, with empty black space either side. Apple's developer guidance says that to be fully optimised, apps need to be built with the iOS 27.1 SDK and have layouts that size from the window rather than the screen, with no orientation-based layout and support for vertical toolbars and tab bars.
Drawn to scale from Apple's published screen sizes. The coloured area is the app.
Service
What we do
Fit every screen
Folded and unfolded, so your app fits properly with no black bars or stretched media.
Same app
No redesign and no new features. Your app, fitted to iPhone Duo, following Apple's published iPhone Duo guidance.
You stay in control
We never need your signing keys or App Store account. You submit the update from your own Apple account.
Process
How it works
Free preview
You give us access to your repository (under a mutual NDA if you'd like), and we send a free before-and-after preview with a fixed quote. No obligation.
We fit it
We make your existing app fit properly to every iPhone Duo screen and return a pull request with a short test guide.
You ship
You review, build and submit the update from your own Apple account. App Store review and any badges remain with Apple; we can't guarantee them.
Pricing
Indicative pricing
GBP per app. These are guide prices: the fixed quote you get after the free preview is what you pay.
Before-and-after preview
Free
Small (up to 8 screens)
£1,250
Medium (9–20 screens)
£2,450
Large (21–40 screens)
£4,500
Custom (41+ screens, games, Flutter/React Native)
from £6,000
Contact
Email bosscheck+panefix@mail.grokbot.com for a free before-and-after preview.