The following are the OS/Browser combinations that are compatible with the Add to Home Screen functionality that makes Progressive Web Apps possible:
Windows/Chrome
Windows/Edge
Windows/Brave
MacOS/Chrome
MacOS/Edge
iOS/Safari
Android/Chrome
Android/Samsung Internet
These configs represent about 85 to 90% of all Internet traffic. So overall support for PWA is widespread.
Platforms with partial or no support:
Notoriously missing is Firefox, which dropped support for PWAs in early 2021.
iOS only supports PWAs via custom Add To Home Screen instructions (out-of-the-box in Progressier!) via Safari.
You can't install a PWA via Safari on macOS (but you can with Chrome on macOS).
Chrome on iOS does not support PWA installation (but Safari on iOS does).
Tizen OS doesn't support PWA installation
Opera doesn't offer support for PWAs either
Looking for an all-in-one solution for your PWA? Try Progressier.