The only other company I know attempting to revolutionize email is Superhuman [0]. It will be interesting to compare these services. One thing I can say is that Basecamp will certainly be competitive if they can offer their service for less than $30 per month, which is how much Superhuman charges currently [1].

[0] - https://superhuman.com/ [1] - https://techcrunch.com/2019/06/27/my-six-months-with-30-mont...