About Slider Captcha
Slider Captcha is a free service that helps protect websites from spam and abuse.
How Slider Captcha compares
- #1
Keybase9.2k - #2Hanko9k
- #3Altcha2.7k
- #4
Friendly Captcha450 - #5
Slider Captcha306 - #6
Limit Login Attempts Reloaded5
#5 of 6 Security we have counts for (of 86) · bars are GitHub stars across these neighbours; the category leader is Keybase at 9.2k · as of August 25, 2026
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#5 of 6 Security
Friendly Captcha#4 of 6 Security
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Implied technologies
Detecting Slider Captcha implies these are in the stack too - a report lists them alongside it.
How we audit Slider Captcha
We measure the detected version against Slider Captcha's release history and grade the surrounding stack with a Lighthouse-grade quality audit. Weak or outdated links weigh more - one risky dependency can pull the whole score down.
How the score worksMore technologies in Security
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Technology definitions from a community-maintained catalogue, licensed GPL-3.0. Attribution and source.