iPad & iPhone

OnDrip: IV drip calculation
Medical
Rerere: Simple Checklist
Productivity
PasswordGen: Generate Password
Utilities
8Planets: Solar System Viewer
Expenses: Spending Tracker
Finance

Apple Watch

Mac

Rerere: Simple Checklist
Productivity
PasswordGen: Generate Password
Utilities
8Planets: Solar System Viewer
Expenses: Spending Tracker
Finance
Rokuyo
Reference