We support the last major version of AngularJS (v1.8.3). You can find the latest version of Never Ending Support for AngularJS here.
We are also offering Never Ending Support for AngularJS 1.5.x. This is based on the End-of-Life 1.5.x branch from AngularJS and includes security fixes which we have back-ported from more recent versions of AngularJS. NES for AngularJS 1.5.x, which supports Ionic 1.x, requires an additional cost beyond NES for AngularJS.