Google's own AI assistant, deeply woven into the apps already on your Android phone — Gmail, Drive, Maps and YouTube. It can replace Google Assistant as the default helper (you can switch back anytime) and summarises your emails or documents on request. Pros: free with your Google account, smartest at anything involving your Google data, and responds to 'Hey Google'. Cons: privacy-conscious users may dislike how much Google data it touches, and a few classic Assistant routines are still missing. Best for Android users already living in the Google ecosystem — students, office workers and anyone who wants AI inside their inbox and calendar.