SliderCAPTCHA reliably protects your forms from bots using a simple, intuitive slider interaction that real users understand instantly. No image puzzles. No tracking profiles. No frustration.
Traditional CAPTCHAs are cumbersome, hurt conversion rates, or raise serious privacy concerns. SliderCAPTCHA relies on a clear, human interaction that effectively blocks automated attacks - while remaining fast, accessible, and pleasant to use.
Intuitive slider instead of image challenges. Self-explanatory - no instructions required. Works seamlessly on desktop and mobile devices.
Reliably detects automated access. Distinguishes human behavior from machine behavior. Protects against spam, form abuse, and automated attacks.
No sharing of user data. No advertising or tracking profiles. GDPR-compliant by design with zero cookies - ideal for privacy-sensitive environments.
Ideal for contact forms, login pages, registrations, and web apps. Suitable for small websites and high-traffic platforms alike.
We handle operation, scaling, and maintenance. No infrastructure required on your side. Ready to use immediately after signup.
If the service is ever unavailable, your forms will not be blocked. Built-in fallback logic ensures zero downtime impact on your users.
SliderCAPTCHA doesn't force itself into your process. It appears only at the right moment - after your own validation is complete - keeping your business logic untouched and the user experience clean.
Your application validates all input fields as usual. SliderCAPTCHA only appears when your own validation passes - eliminating unnecessary CAPTCHA challenges for users who haven't completed the form yet.
A lightweight JavaScript embed presents the slider interaction. The user drags the handle to the end. Human movement patterns are analyzed client-side and a signed token is generated on success.
Your backend sends the token to our verification API via a simple cURL request. We return a pass/fail result. You decide what happens next. The final decision always stays within your application.
Get started in minutes - no SDK required, no infrastructure to manage.
Every aspect of SliderCAPTCHA is designed to maximize security while minimizing friction for real users.
Protect your most critical touchpoints from spam and automated submissions without adding friction for genuine leads.
Prevent credential stuffing and automated account creation with a challenge that bots reliably fail and humans barely notice.
Keep your mailing lists clean and your open rates high by blocking fake sign-ups at the source before they pollute your data.
Manage multiple client domains under one account. Simple sitekey management per domain or subdomain - no extra overhead.
Scale-ready from day one. Our infrastructure handles request spikes automatically. Fair-Use policy means no hard shutdowns during traffic peaks.
Suitable for security-critical forms in regulated industries. GDPR-compliant, no IP logging, no cookies - passes even strict privacy audits.
Integration requires a single JavaScript embed on the client side and one cURL request on the server side. No mandatory SDK, no proprietary libraries. If your environment can send HTTP requests, it works with SliderCAPTCHA.
Step-by-step guides for classic HTML forms and modern AJAX flows:
Traditional HTML form with full diff-view before & after integration
Modern async form with full diff-view before & after integration
Any environment that supports cURL-based HTTP requests works with SliderCAPTCHA. No SDK required.
SliderCAPTCHA was built from the ground up with European data protection standards in mind. There are no hidden data flows, no profiling, no advertising components.
We do not store, process, or transfer any personal data. Verification tokens are ephemeral and contain no user identifiers.
SliderCAPTCHA sets no cookies of any kind - neither session cookies, tracking pixels, nor persistent identifiers.
We do not log, store, or analyze IP addresses. Your users' network identity stays entirely outside our systems.
We have no advertising business. There is no monetization of user behavior data - ever.
Designed to meet EU GDPR requirements out of the box. Suitable for regulated industries, public sector, and enterprise applications.
If our service is temporarily unavailable, your forms continue to work. The fallback is verified server-side to prevent bypass attacks.
SliderCAPTCHA automatically adapts to your users' language. Simply set data-language in the embed script.
Every plan includes a 30-day free trial. Upgrade, downgrade, or cancel anytime.
Enterprise plans include dedicated support, custom domain limits, and a service level agreement.
Everything you need to know before getting started.
No installation required. Client-side is a single <script> embed. Server-side is one cURL API call in your existing backend - no SDK, no framework dependency.
Your forms will not be blocked. SliderCAPTCHA includes a secure fallback mechanism. Your backend verifies server-side whether the service is genuinely unavailable before allowing bypass - preventing attacks that exploit downtime.
Yes. No personal data is stored, no cookies are set, no IP addresses are logged, and there are no advertising or tracking components. Suitable for privacy-sensitive environments and public sector use.
Each domain or subdomain you want to protect gets a unique public sitekey. You embed this key in the client-side script. Your secret key is only used server-side for verification - never exposed to the browser.
No. Tokens are signed, single-use, and time-limited. Replay attacks are detected and rejected by the verification API. Each successful slider interaction produces a unique, non-reusable token.
We operate a Fair-Use policy - no hard shutdowns during short-term spikes. The service stays active. For sustained higher usage, we reach out proactively to recommend an appropriate plan upgrade.
Yes. SliderCAPTCHA works with any web environment that can load JavaScript and make HTTP requests. WordPress, Joomla, custom PHP, Node.js, Python - all supported.
Yes. Agencies can manage multiple sitekeys under one account. Each domain or subdomain gets its own key, making client isolation clean and straightforward.
Whether you have questions about plans, need a custom volume, or just want to discuss your use case - we're happy to help. We respond quickly.
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