Its features were deemed helpful in finding the right messages, and one reviewer noted that the service "feels a lot like the future of email". However, it also received criticism, particularly for a low density of information, algorithms that needed tweaking, and that the service required users to "give up the control" on organizing their own email, meaning that "Anyone who already has a system for organizing their emails will likely find themselves fighting Google's system". Google noted in March 2016 that 10% of all replies on mobile originated from Inbox's Smart Reply feature.