Oh, I totally get it… I’ve been in the same place many times (and I’m sure I will be again…)
I just have a policy of trying to support these things whenever I’m able to, otherwise I feel I’m not able to grumble when privacy respecting apps disappear from existence through lack of financial support…
I’ve used airtable for these sorts of “personal use” use cases (eg: home built rocketry flight log) and I was even able to use their iPhone / Android app to enter data.
I haven’t paid a cent for it yet as I’m well under their data caps.