Invisible CAPTCHA

Invisible CAPTCHA is a cutting-edge solution designed to protect your website from bots and spam while maintaining a smooth and efficient user journey. By operating discreetly in the background, it ensures that only legitimate users can access your content without unnecessary interruptions. This GDPR-compliant technology offers robust security, making it an ideal choice for businesses looking to enhance their website's protection against automated threats.

Invisible CAPTCHA is easy to implement and works effectively across various platforms, providing a reliable defense against malicious activity while prioritizing user satisfaction.

Why our Invisible CAPTCHA is the ideal choice

Our CAPTCHA solution adheres to GDPR regulations, ensuring your website remains compliant with data laws.

No personal data collection

Unlike traditional CAPTCHA, our system collects and stores the least amount of personal data, protecting user privacy.

Enhanced security and user experience

Prevent bots and spam without compromising user trust. Offer a user-friendly interface that keeps users happy.

Easy integration

Enjoy a simple implementation process for websites of all sizes. It's designed to work seamlessly with various platforms.

How Invisible CAPTCHA works

Most of your users are human. The job of an Invisible CAPTCHA is to wave them through silently — and only stop them when there's a real reason to. Prosopo does this by analysing the browser environment and user behaviour in the background, then deciding on the fly whether the visitor needs a visible challenge.

When the signals come back clean, the visitor sees nothing — the form submits, the token is attached, and your server verifies it like any other captcha response. When the signals look automated, the visitor is escalated to an image challenge before the form goes through.

Three ways to run invisibly

Invisible CAPTCHA isn't a single mode — it's a family of three, so you can match the right level of protection to each form.

Mode	What the user sees	When to use
Frictionless (recommended)	Nothing for legitimate users. An image challenge if the request looks automated.	Most forms — best balance of UX and security.
Invisible Proof of Work	Nothing — a computational puzzle runs silently in the browser.	When you want a consistent invisible step regardless of risk score.
Invisible Image	Nothing initially. An image challenge appears on submission.	When image verification is required but you don't want a visible widget on the page.

Switching between them is a one-attribute change on your widget — no integration rewrite.

What Prosopo analyses to make the decision

Behind the scenes, the frictionless flow combines several signals to score each request:

Browser environment — features and quirks that distinguish real browsers from headless automation tools like Playwright and Selenium.
Interaction signals — natural mouse, touch and keyboard behaviour.
Network context — whether the request comes from a network associated with bot traffic.
Site policy — your Safety Threshold setting controls how strict the decision is. Tighter threshold = more challenges, fewer bots; looser threshold = fewer challenges, more bots squeak through.

You can tune the threshold in your portal at any time — useful for raising the bar during an active attack and lowering it back when the wave is over.

Designed for compliance

Invisible CAPTCHA is part of the same GDPR-friendly architecture as the rest of Procaptcha:

No third-party tracking cookies.
IP address is the only personal data stored, retained on the legitimate-interest grounds of fraud and security.
No behavioural profiling sold on to advertisers — unlike the major reCAPTCHA-style competitors.

Availability

Invisible CAPTCHA is available on the Professional and Enterprise tiers. The standard visible widget remains free for up to 10,000 monthly verifications.

How Prosopo Invisible CAPTCHA compares

	Prosopo Invisible	reCAPTCHA v3	Cloudflare Turnstile
Invisible by default	✓	✓	✓
GDPR-compliant data handling	✓	✗	Limited
No third-party tracking cookies	✓	✗	✓
Switch between frictionless / PoW / image modes per form	✓	✗	✗
Tunable strictness without code changes	✓	Limited	✗
Risk score returned to your backend	✓ (paid tiers)	✓	Limited

Common use cases

Stop credential stuffing at login without adding visible friction for real users.
Defend signup forms against fake-account creation.
Protect black-friday checkout flows without slowing legitimate buyers down.
Prevent scraping of high-value pages.

Integration and configuration reference

Get started in 3 simple steps

Our simplified process ensures your website stays secure, user-friendly, and fully compliant, all while enhancing the user experience.

Step 1: Get a unique Procaptcha key

Sign up and receive your unique Procaptcha site key instantly via email. No payment details needed for up to 10000 monthly verifications.

Step 2: Replace your Current CAPTCHA

Click the activation link in your email, then easily integrate our code into your website. It's compatible with major platforms, ensuring a smooth transition.

Step 3: Activate Procaptcha

Activate protection instantly and start enjoying better bot identification with enhanced user privacy and lower costs.

Frequently Asked Questions

What types of bot attacks can Procaptcha Invisible protect against?

It provides comprehensive protection against various automated threats, including webscraping, credential stuffing, account takeover attempts, click fraud, distributed denial of service (DDoS) attacks, inventory hoarding, credit card fraud, and other forms of malicious bot activity that can harm your online business or compromise user data.

What makes Prosopo's Invisible CAPTCHA more cost-effective than competitors?

With no hidden fees and transparent pricing, our solution provides an affordable alternative to expensive services like reCAPTCHA, hCaptcha, DataDome, Cloudflare Turnstile, Akamai Bot Manager, Castle.io, Human Security, FriendlyCaptcha, etc.

What is Procaptcha Invisible CAPTCHA?

Invisible CAPTCHA is a security solution that operates in the background, verifying users without interrupting their browsing experience. It uses advanced algorithms to analyze user behavior and interactions, ensuring that only legitimate users can access your content.

How does Procaptcha's Invisible mode work?

Procaptcha dynamically evaluates user interactions by analyzing browser environments and behavior. Based on risk scores, it automatically applies the appropriate challenge, making it difficult for bots to bypass while ensuring real users see nothing at all.

Can Procaptcha Invisible distinguish between good bots and bad bots?

Yes, Procaptcha Invisible intelligently differentiates between beneficial bots (like search engine crawlers) and harmful bots by analyzing behavior, origin, and intent. It ensures that only trusted bots and genuine users gain access while blocking threats.

Does Procaptcha Invisible require storing user data?

No, our solution is privacy-first and compliant with data protection regulations. We store IP address only, which we store on the grounds of legitimate interest to prevent fraud and to ensure the network and information security of your IT systems.