Yeah, I just checked. I've been using Weekcal for a few years, and I think I paid £4 for it, before it went subscription. Luckily, I still get updates and the main thing I don't get is linking reminders to my calendar app. I don't want to do that, so I'm fine with not subscribing. I do like the Agenda view.
Readdle do a free Calendar app "Calendars" (also requires a payment to get reminders integrated) and their weekview is interesting, but I keep going back to Weekcal. Readdle Calendars has a really good list view though.
And to top it all off, I use an app called WidgetCal, to get a nice monthly calendar showing on my notification centre. This is also free (if that's all you want to do with it).