What are some alternatives?
When comparing Slack Beta and Smart Slack Reminders, you can also consider the following products
Slack - A messaging app for teams who see through the Earth!
Slack Video Messaging by Standuply - Easily record and send video messages in Slack 📹
Slack for Mac - A new, improved Slack desktop app for Mac
Workplace by Facebook - Connect everyone in your company and turn ideas into action.
Reminder - A better way to keep track of your reminders 📝
Riot.im - Open source interoperable collaboration app.