Spark was great until v3 took away their attention from fixing bugs in v2 and killed the third column in v3. Because of the lack of 3 columns, it is pretty much unusable on a tablet or laptop.
Sparks support team has always been a, “that’s great; we’ll tell our product manager” and then nothing happens. This seems to be happening with the third column, which is disappointing.
I switched to Canary mail, which has its own set of issues as they try to throw AI at everything, but if you turn all that off and customize the toolbar a bit, you get what Spark was with 3 columns.