Question: to do list app iphone and mac?
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)