Beeper

Stay connected to the conversations that matter the most. Send texts, photos, videos, and more. Use Messages on your iPhone, iPad, or iPod touch. Then personalize your messages with animated effects, pin your important conversations, send inline replies, and add mentions. With Messages in iOS 14, you can pin up to nine conversations. When you pin a conversation it shows up at the top of the Messages app, so it's easy to get to. With iOS 13 and later, and iPadOS, You can share your name and photo when you start or respond to a new message. You can use a Memoji, or a custom image for your photo. Messages is the text-messaging software included with your Mac. Use it to send messages with iMessage, or to send SMS and MMS messages through your iPhone. With Messages for Mac, you can send unlimited messages to any Mac, iPhone, iPad, or iPod touch that uses iMessage, Apple's secure-messaging service. iPhone owners can use it for SMS and MMS messages, too.

Slack is a cloud-based project collaboration and team interaction software solution specially designed to seamlessly facilitate communication across organizations. Featuring powerful tools and services integrated into a single platform, Slack provides private channels to promote interaction within smaller teams, direct channels to help send messages directly to colleagues, and public channels that enables members across organizations to start conversations. Available on Mac, Windows, Android, and iOS apps, Slack offers a plethora of features that include chat, file sharing, collaborative workspace, real-time notifications, two-way audio and video, screen sharing, document imaging, activity tracking and logging, and more.