Answer
Does Samsung Internet support PWAs?
Yes. Samsung Internet, the default browser on Samsung Galaxy phones, is built on Chromium and supports installable PWAs — including the manifest, service worker and beforeinstallprompt criteria used by Chrome. Users install via the browser menu’s "Add page to" → "Home screen" option, and Samsung Internet was historically one of the earlier mobile browsers to support Web Push notifications for installed PWAs.
Installing on Samsung Internet
Menu (three lines) → "Add page to" → "Home screen", which behaves like Chrome’s install flow since both share the Chromium/Blink engine.
Feature parity with Chrome
Because it shares the same rendering engine, most Chromium-only web APIs (Web Push, Background Sync, Badging) behave the same on Samsung Internet.
Market relevance
Samsung Internet has significant market share among Android users specifically on Samsung Galaxy devices, making PWA compatibility with it worth testing separately from stock Chrome.