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.
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