Radialday

Radialday is a visual day planner for iPhone that draws the day as a 24-hour dial, with midnight at the top. Time blocks sit on the dial as arcs, so a glance shows the shape of the day instead of a scrolling list of hours. Focus mode keeps a single block in front of you. Insights summarize how the day was used. An optional read-only iPhone calendar can sit on the dial as an outer ring, and Radialday does not write back to that calendar. Planning stays on the device: no account, no tracking, and no subscription. You buy it once, about $0.99 or €0.99. It is made in Germany by Antonio-Pio Basile of A-C Solutions.

App Store: https://apps.apple.com/us/app/radialday-tagesplaner/id6809176869
Support: https://www.a-c.solutions/radialday/support