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Productivity · iPhone Duo app
by Roger Sengthavychith
A pocket notebook with its cover outside and a two-page spread inside.
iPhone Duo support
Confirmed
Checked by hand against the App Store.
Screenshots
Screenshots from the App Store. Tap one to see it full size.
On iPhone Duo
Gratefold is a digital pocket notebook with covers of cotton paper, felt or cork that wear in over time. Folded, the outer screen is the cover; unfold it for a two-page spread or hold it upright for one big page.
Yes. iPhone Duo support is confirmed in the App Store description of Gratefold version 1.0.2, released Nov 8, 2026.
Gratefold is free to download on the App Store.
Gratefold is made by Roger Sengthavychith and is in the Productivity category.