Appcues, Usetiful, Arrows, GUIDEcx, ClientSuccess and Common Room are all chasing the same fragile stretch after a customer signs - the weeks that decide whether they stay. Here is how six very different tools split the job of keeping people from quietly leaving.

Two friends who lived two blocks apart built an onboarding tool, then bet the whole thing on HubSpot - cutting a third of the features to go deeper. It became one of the marketplace's most-installed apps.