Cloudflare Turnstile review
A free CAPTCHA alternative with adaptive checks, invisible modes and server-side validation.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Cloudflare Turnstile is a CAPTCHA alternative for websites and applications that need to distinguish human visitors from automated traffic. It fits teams seeking verification that can avoid interrupting visitors, from solo projects through enterprise organizations. Turnstile operates independently of Cloudflare’s CDN and supports web and API use, so sites hosted elsewhere can use it too.
Its three widget modes offer different levels of friction: managed mode uses risk signals to decide whether an interactive checkbox is needed, while non-interactive and invisible modes avoid that checkbox experience. Client-side browser challenges include proof-of-work and proof-of-space. For sensitive actions such as login or form submission, the Siteverify API validates tokens server-side. Pre-clearance cookie support is available for single-page applications, and Turnstile Analytics provides challenge and solve-rate metrics. Widget size, appearance, theme, language and accessibility settings are configurable; the listed accessibility posture includes WCAG 2.2 AAA compliance.
The published plans show a Turnstile Free option with up to 20 widgets, unlimited challenges and community support. Enterprise adds unlimited widgets and challenges, up to 200 hostnames per widget, and a 30-day analytics lookback; pricing is custom. Documentation and community support are the listed support channels, so organizations that require a different support arrangement may want to weigh that fit. Turnstile is a strong option for teams that want free, adaptable web CAPTCHA without a numeric monthly verification cap. Teams that specifically require audio challenges should consider another product.
Cloudflare Turnstile pros and cons
- Where it wins
- Free plan includes up to 20 widgets and unlimited challenges
- Managed mode can require a checkbox based on risk signals
- Siteverify API validates tokens server-side
- Where it doesn't
- Free plan support is community-based
- Enterprise pricing is custom
- No audio challenge option
Cloudflare Turnstile fact sheet, pricing and score →
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