Device requirements

Minimum means 60 or more average FPS on 1.12.2 with OptiFine installed at lowest settings.
Recommended means 60 or more average FPS on 1.21.1 with OptiFine installed with the following settings:
10 Render Distance
Smooth Lighting
All animations
75% Resolution

Android

Minimum requirements:

Qualcomm Snapdragon 460 (or equivalent)
Android 5.0
1GB RAM

Recommended requirements:

Qualcomm Snapdragon 855 (or equivalent)
Android 8.0 and newer
6GB RAM or higher

ChromeOS

Chromebooks have very similar system requirements, however Android version does not matter, as long as you can install Android apps.

iOS

Minimum requirements:

Apple A8/A8X SoC
iOS 14/iPadOS 14 or higher
- iOS/iPadOS 12 & 13 is losing support in PojavLauncher 2.3.
2GB RAM

Recommended requirements:

Apple A14/A12X Bionic SoC
iOS/iPadOS 14 or higher
6GB RAM or higher