Hacker101 offers a free web security class with lessons and Capture the Flag challenges.
CTFtime
vsCTF101
CTFtime vs CTF101
How do CTFtime and CTF101 compare? Here are the facts side by side: pricing, platforms, open-source status and what each one is for.
| Directory detail | CTFtime | CTF101 |
|---|---|---|
| What it is | CTFtime lists upcoming and past Capture the Flag events, teams, tasks, ratings, and writeups. | The CTF101 wiki introduces Capture the Flag competitions and explains related security concepts. |
| Website | ||
| Type | Website | Website |
| Topic | ||
| Pricing | Not confirmed | Not confirmed |
| Platforms | Web | Web |
| Open source | Not stated | Not stated |
| Language | English | English |
| Alternatives |
Other options to consider
Sites similar to both CTFtime and CTF101.
CTF Sites lists Capture the Flag sites and provides a directory for finding cybersecurity challenges.