ProInbox is a free Android messaging app developed by NorthStudio. This app offers advanced messaging features that go beyond the standard messaging experience. ProInbox is designed to enhance your messaging experience with features like auto-reply messages, inboxes classification, and the ability to block the "seen" feature and typing indicator when messaging.

ProInbox stores your personal data on your device, and if you log in with your Facebook account, your account may be subject to checkpoint scanning by Facebook. However, the developers are not responsible for any checkpoint issues that may arise.

One of the standout features of ProInbox is the ability to set auto-reply messages. This feature is particularly useful if you're away from your phone or unable to respond to messages. Additionally, the inboxes classification feature allows you to organize your messages into categories, making it easier to find specific messages.

Another feature that sets ProInbox apart from other messaging apps is the ability to block the "seen" feature and typing indicator when messaging. This means you can read messages without the sender knowing that you have seen them.

Overall, ProInbox is a great messaging app for anyone looking for advanced features beyond the standard messaging experience. It's free to use and offers a range of features that can enhance your messaging experience.