Question: to do list app mac and iphone?
Answer: Things (macOS, iPhone, iPad) Best blend of powerful features with elegant design. ... 
Todoist (macOS, iPhone, iPad, Watch, Android, Windows, Web) ... 
OmniFocus (macOS, iPhone, iPad) ... 
GoodTask (macOS, iPhone, iPad, Watch) ... 
2Do (Mac, iPhone, iPad, Android) ... 
TaskPaper (macOS) ... 
TickTick (Mac, iPhone, iPad, Watch, Android, Windows)