ShieldCaptcha

At a glance

• Editor score
  7.5 / 10
• Pricing
  Free plan
• Best for
  Teams wanting many challenge types and self-hosting
• Free plan
  Yes
• Paid from
  Free
• Facts checked
  22 Oct 2026

• Where it wins

  • Adaptive checks can use background proof-of-work or visible challenges.
  • 101 documented challenge types span 12 categories.
  • Self-hosting, audio alternatives and accessibility support are available.

• Where it doesn't

  • Self-hosting requires Node.js, PostgreSQL and Redis.
  • The listed SDK platform is web.
  • Higher-risk requests can receive visible challenges.

Our verdict on ShieldCaptcha

ShieldCaptcha protects website forms from automated submissions. Its adaptive risk engine can let low-risk visitors pass through a background proof-of-work check and present visible challenges to higher-risk requests. The widget integrates through a script tag and hidden form token, with server-side verification through an API. Teams that want a choice of challenge styles, accessibility options and control over deployment may find its approach a fit; it is more specifically oriented to form protection than to a broad set of security tasks.

Challenge breadth is a notable part of the product: ShieldCaptcha documents 101 challenge types across 12 categories, including visual, invisible, proof-of-work and risk-based modes. Audio alternatives cover motion, text and math challenges, and keyboard and screen-reader support is included. The service states that it uses no tracking cookies and makes no third-party requests. Single-use encrypted tokens are valid for five minutes, while domain restrictions, key rotation, verification logs and analytics add controls around implementation and oversight.

Hosted captcha.ee accounts are free with no plans or quotas, according to the product information. Self-hosting is also available, using Node.js, PostgreSQL and Redis, which makes it an option for teams prepared to run those components on their own infrastructure. The listed SDK platform is web, and visible challenges may still interrupt higher-risk visitors despite the low-risk background check. Teams seeking a CAPTCHA focused on website forms, broad challenge choice or self-hosting should consider ShieldCaptcha; those needing a wider listed SDK platform range or a flow that avoids visible prompts for every risk level may prefer an alternative.

Your product? Our editors can test ShieldCaptcha in depth and publish a review, labelled as paid · from $149/mo →

ShieldCaptcha pricing

ShieldCaptcha fact sheet

Alternatives to ShieldCaptcha

• CTCloudflare TurnstileA free CAPTCHA alternative with adaptive checks, invisible modes and server-side validation.9.4
• GRGoogle reCAPTCHAAdaptive bot protection with web and Android options and a free monthly allowance.9.2
• ACAlibaba Cloud CAPTCHAA managed CAPTCHA service with regional per-call pricing and policy controls.9.0

See all ShieldCaptcha alternatives →

Featured on iTechGuides

ShieldCaptcha is listed in our CAPTCHA Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 29 Oct 2026 · How we research and update