Hacker101 offers a free web security class with lessons and Capture the Flag challenges.
CTFtime
CTFtime lists upcoming and past Capture the Flag events, teams, tasks, ratings, and writeups.
About CTFtime
CTFtime is a web platform dedicated to Capture The Flag (CTF) cybersecurity competitions. It aggregates listings of upcoming and past CTF events, along with associated tasks, team writeups, and multi-year team rating leaderboards.
The site also offers tools for comparing team ratings and creating new CTF teams.
Key features
- Aggregates upcoming and past CTF event listings
- Hosts public multi-year CTF team rating leaderboards
- Allows comparison of ratings between CTF teams
- Enables users to create new CTF teams
- Provides access to CTF task writeups
- Includes a CTF event calendar view
Best for: CTFtime is most useful for CTF competition participants, team organizers, and cybersecurity enthusiasts seeking event information and practice materials.
Good for
- Maintains an extensive archive of CTF events and ratings dating back to 2011
- Consolidates CTF event details, tasks, writeups, and team tools in one platform
- Offers public, searchable CTF team rating leaderboards for comparison
CTFtime at a glance
- Website
- ctftime.org
- Category
- Education & Learning › Learn to Code
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
CTFtime alternatives
Tools and sites you could use instead, ranked by how closely they match.
CTF Sites lists Capture the Flag sites and provides a directory for finding cybersecurity challenges.
The CTF101 wiki introduces Capture the Flag competitions and explains related security concepts.
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CTFtime FAQ
What CTF resources are available on CTFtime?
CTFtime hosts listings of upcoming and past CTF events, team ratings, CTF tasks, and event writeups.
Can users create a CTF team on the platform?
Yes, users can create new CTF teams via CTFtime.
Does CTFtime have historical CTF rating data?
Yes, the platform hosts public team rating leaderboards dating back to 2011.
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