I've been a paying user of Checkvist for years. It's a a pleasing rarity in the contemporary web software world - a simple useful and reliable keyboard-driven tool with little hype and no world-conquering aspirations. It improves year on year, but at no great velocity. It seems to be entirely the property of a team of 2 who are personally responsive at their user forum (https://discuss.checkvist.com/). I supposed one could call it 'artisanal', but it was that before the term came into regrettable fashion.