Edit: I forgot, they were one of the first YC companies. Looks like the parent company got acquired by Motorola and somewhat shutdown their 280slides/Atlas projects. One founder also later started RunKit which was bought by Stripe. https://en.wikipedia.org/wiki/280_North,_Inc.

Ugly: it looks like a bad imitation of the appearance of Mac OS X from a mixture of 2002 and 2007, regardless of the fact that I’m on Windows in 2019; and due to pervasive use of 1× raster images instead of vector graphics, gradients, &c. is even more ugly on a high-DPI display. (This use of raster images without complete preload causes rendering issues when a control state is achieved for the first time, too, just like the rollover effects of the era, long since obsolete.)

Unusable: it implements scrolling from scratch, which I have never seen work well, or even almost well—it’s just something that you should never under any circumstances do; in this case, I can only get their demos to scroll at about 1% of normal speed on my Surface Book’s touchpad, and touch-based scrolling doesn’t work at all.

It tried to be Cocoa on a platform that is not Cocoa at all, with what was even a mediocre implementation a decade ago, let alone now. (I remember being excited about it when it was first announced, until I actually tried using it.)