I've been using this for the past 4 years. They've got a nice iPad app that includes highlighting, but unfortunately their desktop app can't handle highlighting

I've been using this for the past 4 years. They've got a nice iPad app that includes highlighting, but unfortunately their desktop app can't handle highlighting yet. :( Their priorities are a bit backward. The desktop app has been surpassed by almost all other competitors mentioned here. Sad. Used to be great.