kintone can be accessed from a Web browser (Safari for iOS) or the mobile app "Kintone Mobile". You can use your iPhone or iPad device to check notifications or enter information in kintone on the go, even when no PC is available.

Safari for iOS is recommended when kintone is customized with API and JavaScript or if you want to use multiple tabs.
kintone Mobile can send push notifications to you.
You can use either the web browser or mobile app according to your purposes. You can also switch between using both if you wish.

For details on how to use kintone on Safari for iOS, see Using Kintone on Safari for iOS.
For details on how to use Kintone Mobile, see Using a Mobile App for iOS.