Challo supports the following:

Applications
Mobile devices
Desktop devices
Browser or endpointVersion
Chrome84+
Also available as an application, see: Installing the Challo application.
Firefox68+
Safari12+
Edge84+
Android ChromeAndroid 4.4+ / 64+
Also available as an application, see: Installing the Challo application.
iOS SafariAll Apple devices running iOS 12+, under support of Apple, with hardware specifications greater than or equal to the iPhone 6.
iOS
iPhone and iPad
The Challo application is available on the App Store.
Requires iOS 11 or later. Compatible with iPhone, iPad, and iPod touch.