Google Tasks for Mobile is the standalone tasks app for all G-Suite Users. Available on iOS and Android.
Coming clean: I am a Product Manager for GQueues. We've been around for 8 years and have developed a task management app that integrates exclusively with Google Products; Gmail, Google Calendar, and Google Drive. We have repeating task, mobile apps for Android and IOS, sharing, task assignments, etc. etc. Come give us a try - https://goo.gl/VLbbT8
Great new UI, but still has the limited features tasks has always had.
Lacks collaboration features like sharing and task assignments