1
Hackers101
hacker101.comSame kind of website
Hacker101 offers a free web security class with lessons and Capture the Flag challenges.
Alternatives
The Best CTFtime Alternatives in 2026
3 alternatives
Looking for something like CTFtime? Here are 3 alternatives, ranked by how closely they match it on purpose, features and platforms.
CTFtime lists upcoming and past Capture the Flag events, teams, tasks, ratings, and writeups.
Top picks at a glance
First suggestionHackers101Hacker101 offers a free web security class with lessons and…Another optionCTF SitesCTF Sites lists Capture the Flag sites and provides a…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Hackers101 | — | Not stated | Web |
| 2 | CTF Sites | — | Not stated | Linux, Web |
| 3 | CTF101 | — | Not stated | Web |
All CTFtime alternatives
2
CTF Sites
ctfsites.github.ioSame kind of website
CTF Sites lists Capture the Flag sites and provides a directory for finding cybersecurity challenges.
3
CTF101
ctf101.orgSame kind of website
The CTF101 wiki introduces Capture the Flag competitions and explains related security concepts.
No alternatives match this filter.
Alternatives to similar tools
What is the best alternative to CTFtime?
Based on features, tags and platforms, the closest alternatives to CTFtime are Hackers101, CTF Sites, and CTF101.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative