Ripcord[1] does what you describe. My guess is that Slack doesn't do this because it makes Slack's latency extremely obvious. Even on a great connection, a dece

Ripcord[1] does what you describe. My guess is that Slack doesn't do this because it makes Slack's latency extremely obvious. Even on a great connection, a decent fraction of messages will take multiple seconds to go from gray to black. Apparently even when Slack's API is operating normally, it can take a very long time to respond with, "Your message was received." 1. https://cancel.fm/ripcord/ https://cancel.fm/ripcord/