There are many paid services I use, but which I don't pay for as a developer. I mean, AWS, Datadog and other managed services like this are taken for granted, but I don't pay for them as a developer (and my personal aws accounts are just peanuts ;))
So the items I will list below are things I pay on my own, because they help me be a better developer (or at least makes my life easier)
Services I don't pay yet.... but every month I hesitate (feedback welcome)
Oddly enough, this post makes me realize I don't have a lot of subscriptions, but I'll spend a lot on ad-hoc things (some books, software, equipment), but as soon as it requires a subscription , it implies we need it constantly for work, and then it needs to be covered by the company