Apple Reminders evolved from a basic checklist into a capable task manager with subtasks, tags, smart lists, templates, grocery list mode, and deep Siri integration. Free on every Apple device, it syncs instantly across iPhone, iPad, Mac, and Apple Watch. Its natural language input and location-based reminders make it the most accessible entry point for personal task management in the Apple ecosystem. For users with straightforward needs who want zero friction and zero cost, Reminders may be the only task app they ever need.

Reference:

Apple Reminders on Wikipedia

https://en.wikipedia.org/wiki/Reminders_(Apple)