CodeSignal
Follow practice paths for coding and interviews with an AI tutor
For individual learners, CodeSignal now offers a product called Learn. You follow paths of short practice lessons, such as an intro to Python, full-stack JavaScript or a four-week coding interview prep plan. An AI tutor called Cosmo helps when you get stuck and suggests next tasks.
Freemium · Browser · Beginner
About CodeSignal
It trains coding skills and interview readiness in small steps. It suits beginners and job seekers who want guided practice. Many companies also use CodeSignal tests when they hire, so the format may be familiar later.
You can start for free in the browser or the mobile app. A paid plan, Cosmo+, adds more AI help. The site also offers certificates and a skills profile you can show employers.
On Breakpoint since 23 Oct 2026.