Which BLE label printer works with an Android PWA?

The Phomemo M120 and M220 are reasonable candidates to investigate. There's an open-source browser label app reported to work with them over Web Bluetooth on Android Chrome, and the related M221 has also been reported to work. That is encouraging, but it doesn't establish how reliable every model or firmware version will be.

Try the exact printer, Android device, and browser before buying a batch. Check whether it reconnects after the printer sleeps, the screen locks, or the tab loses focus. A wake-up print has been suggested as a workaround for sleep-related reconnect issues, though that may not solve every dropped connection.

Look beyond the word Bluetooth on the product page. Web Bluetooth needs BLE, and the printer also needs accessible GATT services and a command format your app can use. A printer that advertises BLE is not automatically a browser-ready label printer.

Some Star printers may be worth looking at, but check the exact model and label capabilities. Prototype the browser connection and an actual barcode label before standardizing on one.

Plan for connection failures in the interface. Give users a clear way to reconnect and retry a label, rather than assuming a paired printer stays connected forever. Discovery permissions and settings on Android are also worth checking during testing.

If direct browser printing proves too restrictive, a small native bridge could handle the printer connection while the PWA sends print jobs to it. That broadens the options, but it does mean installing and maintaining an app, so it doesn't meet the original no-native-app requirement.

A wired serial connection or a separate print server are other possible routes, but neither is quite the same as walking around with a phone and a wireless printer. I'd treat those as fallback designs rather than assume they're interchangeable with Web Bluetooth.