Retain, next to the alternatives
What each tool is actually for, what it costs, and where Retain is the wrong answer. Pricing comes from the public pages of each product.

Retain vs Baremetrics
Retain vs Baremetrics, for lean teams. Baremetrics reports what already happened to your revenue. Retain predicts voluntary churn from product usage before the cancel.

Retain vs ChurnZero
Retain vs ChurnZero, minus the demo call. ChurnZero is an enterprise CS platform for teams with CSMs. Retain is self-serve churn prediction for small teams that can no longer keep a close eye on every account.
Retain vs Custify
Retain vs Custify, from the person who builds one of them. Custify is an approachable CS platform for teams with CSMs. Retain predicts churn for small teams that can no longer keep a close eye on every account.

Retain vs Gainsight
Retain vs Gainsight, roughly a smoke alarm next to a fire department. Gainsight is the broadest enterprise CS suite. Retain is self-serve churn prediction for small teams.

Retain vs Totango
Retain vs Totango without the sales spin. Totango is an enterprise customer growth platform for post-sales orgs. Retain is self-serve churn prediction for small teams that don't have one.

Retain vs Vitally
Retain vs Vitally, no CS org required. Vitally is a polished customer success workspace for teams with CSMs. Retain is self-serve churn prediction for small teams that can no longer keep a close eye on every account.