Angular vs AngularJS: Choosing the Right Framework for Your Next Project
Estimated study time: 14 minutes.
Despite the similar name, Angular (2+) is a complete rewrite of AngularJS (1.x), not an upgrade. Understanding the differences matters if you're choosing a framework or maintaining an older codebase.
Architecture
AngularJS is built around controllers, $scope, and a two-way digest cycle. Angular replaced this entirely with a component-based architecture, using TypeScript, dependency injection, and a much faster change-detection system.
Key Differences
- Language — AngularJS uses JavaScript; Angular uses TypeScript by default.
- Mobile Support — AngularJS has no real mobile support; Angular supports responsive and mobile development natively.
- Performance — Angular's change detection and Ivy renderer are significantly faster than AngularJS's digest cycle.
- Structure — AngularJS uses MVC with controllers and
$scope; Angular uses a component-based, directive-driven structure. - Maintenance Status — AngularJS reached end-of-life in January 2022; Angular is actively developed with regular major releases.
Which Should You Choose?
For any new project, the answer is straightforward: use modern Angular. AngularJS is legacy technology at this point, kept alive mainly in older enterprise codebases that haven't been migrated yet.
- Starting fresh? Learn and use Angular (the current major version).
- Maintaining an old AngularJS app? Plan a migration path — Google's official ngUpgrade tooling can help move incrementally to Angular.
💡 Tip: If a job posting or codebase just says "Angular," always confirm whether they mean AngularJS (1.x) or Angular (2+) — the skill sets barely overlap.