I'd say I'm roughly in the 2-4 camp, but it also depends on what we define as a productivity app, and what kind of projects i have going on. For instance, Zapier is probably one, yeah? I don't use it regularly for a lot of stuff, but every now and then i get a use case where it's helpful but don't always need it long term.
As business owner, the lines between personal and work get pretty blurry. I don't think I could distinguish between the two regarding productivity apps. That said, I use Obsidian, Todoist, and Notion mostly for non-team related items
How broadly do you want to define productivity? Things I use (nearly) every day just for personal use: Headspace, Daylio, MyTherapy (meds tracker), Evernote, Google Tasks, Alexa.
Layer in work things I can't live without: Zapier. Zapier. and probably Zapier as a close third. Everything else is replaceable, but Zapier is not.
I used to have a lot of different productivity apps before, and it was hard for me to log in to multiple URLs.
Since I just need basic stuff, I started creating whatever productivity app that I needed at the time, and kept on creating.
So under one stack, I now have more than 10 productivity apps, from CRM, Expense Tracker, Notes, Calendar, To-Do List, Blogging, Inventory Management, Document Management, Ticketing System, Work Order Management, Collaboration, etc.
Using enterprise architecture design, the system can have multiple users under 1 main company account, so you can share your data with your team.
I will be launching on PH soon. Looking for beta users ;)
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