The following browsers, as of Aug 2017, are supported for native web push notifications:

Browser Mac OS Windows iOS    Android
Chrome v42+ Yes Yes No Yes
Firefox v44+ Yes Yes No Yes
Safari v7.0.3+
Yes No No n/a
Opera v46+ Yes Yes No Yes

Please note: As of Aug 2017, our Javascript client library does not support native web push notifications so at present it is expected that you use the Web Push API directly. We will be adding support soon, get in touch if you need help.