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Same reason it's only on android, I believe it uses some API specific to chrome & android. Not sure exaxtly what, though.

• mtmail 12y ago
  Maybe http://caniuse.com/#feat=serviceworkers http://caniuse.com/#feat=serviceworkers I'm just guessing.
  • nsm 12y ago
    Serviceworkers only shipped in Chrome 40 which was released on Jan 30, so that is not the reason. it is the filesystem api.
• coralreef 12y ago
  WhatsApp is only on android? I have it on my iPhone...
  • infinii 12y ago
    the web version, not the mobile app.