Semver, or Semantic Versioning, is a technique of providing descriptive version numbers for your software. Semver is very common, and it's possible you may already be using is without knowing!
If your application is using semver then ReleasePage can tailor your subscription emails to the versions that your users are interested in. For instance, a user can subscribe to only receive updates for major version changes. If so we will only send them an email if your app major version changes (eg v1.0.0 to v2.0.0),
Read more about semver on http://semver.org.