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The app and its data export features have some kind of bad limitations for the sort of exploratory work I'm doing today so I'm supplementing that with a low detail paper log.
I'll probably end up MITMing the app to figure out how to get at the native data at some point.
Probably the biggest limitations on the app are that you get 3 markers and if you try re-using one the first one gets deleted. Personally, I'd be happy to use 8-10 roast progression marks. The marks also don't get a column in the CSV export which makes that data less useful unless you make a point of copying that over (at which point you may as well just note times on paper and use as many notes as you want). Maybe the Cropster export is better, but I'm not paying >$3000/yr to lose features.