Some reasons I wanted to do this in the browser:
1. Editors in other programs don't have the right feature set at a fundamental level. They look suitable for the task and if you get over the overly steep learning curve that arises from that mismatch you can kind of make it work, but the real result is people don't use the tool as often as they would if it were good.
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2. This is something that's useful for anybody doing profile coffee roasting regardless of what machine they're on, what software they're using (if they're using any at all). I didn't want to tie this too closely to Typica so people who are good with using paper and pen or competing software can also use this.
