Slack

Slack is one of the most widely used communication apps in the workplace, and for a good reason. It replaces long email threads with channels, direct messages, and searchable conversations.

It works especially well for teams that need to stay connected across devices. You can check a conversation from your iPhone, respond from a browser, and continue working from the desktop app later. The experience is the same on all devices, so you don’t have to relearn the app each time.

Slack also supports file sharing, app integrations, workflow automations, and threaded replies. Those features help teams keep conversations organized and give you a couple of extra tools to make work more manageable, like a personal chat where you can store your thoughts that no one else can see.