It matters even more if you need to maintain several-year-worth of information concerning hundreds of customers and share them with others. None of the apps you mentioned above offer the essential privacy and security you need for business use like that. A bit old and outdated, but still a case in point. And, for that, what makes you think Notion is good enough for storing hundreds of customer data? And, not to... Source: almost 3 years ago

Eventbot is a calendar tool specifically built for Slack that allows you to see your calendar and collect RSVPs for team events within messages and channels. This enables your team to use Slack as a central place for tracking who's in and who's out for team events. You can also create shared calendars for your Slack channels so everyone can see each other's availability and events. What's great about Eventbot is... - Source: dev.to / almost 3 years ago