The best productivity app is the one that stays out of the way. Here are the minimal iPhone apps worth keeping, and a simple setup that covers most of what you need.
What makes a productivity app minimalist?
It does one thing well, requires no maintenance or setup, and stays out of the way when you don't need it. You open it, use it, close it. No inbox to manage, no daily configuration, no system to maintain.
Minimal task trackers
Apple Reminders is already on your phone and does the job. Clear is a good pick if you like gesture-based lists.
Focus and app blockers
StrictBlock blocks distracting apps on a schedule. Minimal setup, real friction. For people who keep opening social apps without thinking.
One Sec and Be Focused are good alternatives, depending on whether you prefer a pause-based or timer-based approach.
Notes and capture
Apple Notes is more capable than it gets credit for. Bear is good for people who prefer markdown. Both stay out of the way.
A simple setup that works
Apple Reminders for today's tasks, StrictBlock for focus sessions, and Apple Notes for everything else. That's it. Three apps, each doing one thing well. No overlap, no maintenance, no productivity theater.