draw.io online supports:

  1. Internet Explorer 11+
  2. Chrome 32+
  3. Firefox 38+
  4. Safari 9.1.x, 10.1.x and 11.0.x.
  5. Opera 20+
  6. Native Android browser 5.x+
  7. The default browser in the current iOS major version and the previous iOS major version (e.g.11.2.x and 10.3.x).
  8. Edge 23+

If you use draw.io with a host product or integration, for example Confluence or Google Drive, the supported browser list will match that of the host product or integration.