How many platforms do you use to manage your day-to-day operations?

Before I started on my journey to build an AI Project Management tool specifically for my Web Development Agency to consolidate our operations and save our project managers (and those of our clients) a ton of time and resources, we used to use so many various platforms and tools to handle day-to-day operations. We used to use Google Drive, Notion, Slack, ClickUp, Harvest, email, and more to cover all of our daily operations on the development side alone, which proved horribly inefficient for us. So, I'm curious: how many platforms do you use to manage the day-to-day operations at your business? What platforms do you use? And do you think that number is too many, too few, or just right? I'd love to hear your insights!