kintone can be accessed from a Web browser (Chrome for Android) or the mobile app. You can use your mobile device to check notifications or enter information in kintone on the go, even when no PC is available.
Mobile app 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 the mobile view on Chrome for Android, see the "Using Kintone on Chrome for Android" page.
For details on how to use the mobile app, see the "Using the Mobile App for Android" page.