Install MacroCodex on your iPhone.
MacroCodex works as a web app on iPhone. The clean path is: open it in Safari, tap Share, then tap Add to Home Screen.
Steps
1
Open in Safari
Open web.macrocodex.app in Safari, not Chrome.
2
Tap Share
Tap the Share icon at the bottom of Safari.
3
Tap Add to Home Screen
Confirm the name, tap Add, and MacroCodex will appear like an app icon.