TrustCaptcha - Bot protection

Groovy CAPTCHA. Eliminate bots and spam.

TrustCaptcha reliably shields your Groovy applications against automated attacks and spam in minutes with the pre-configured CAPTCHA-for-Groovy connector. TrustCaptcha prevents prospects from bouncing by totally eliminating bothersome visual puzzles or challenges. TrustCaptcha secures you against privacy breaches and fines – rely on the European CAPTCHA option for Groovy with an explicit focus on data protection and GDPR adherence.

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GDPR compliant

EU hosted

Trusted by companies, organisations and governments.

Why TrustCaptcha

TrustCaptcha saves you money and increases your conversion

Save money! Eliminate botsProtect your website from bot attacks and spam. Save yourself the resulting follow-up costs for higher server capacity, support staff, moderation teams and software developers. Learn how TrustCaptcha eliminate bots

Avoid fines! Be GDPR compliantDon't worry about the legal situation, bureaucracy and the threat of fines. Use TrustCaptcha-for-Groovy as a data protection-friendly and GDPR-compliant CAPTCHA alternative. More about the GDPR-compliance of TrustCaptcha

Don't lose customers! Increase conversionDon't make it difficult for your users to use your website with annoying image puzzles or tasks. Our CAPTCHA-for-Groovy ensures maximum conversion by making the website accessible to everyone with one click. Learn how TrustCaptcha makes your website accessible

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Integrate TrustCaptcha

Integrate TrustCaptcha in Groovy now! Simply follow these steps

Integrate TrustCaptcha with Groovy quickly and easily into your website, application or platform in just a few steps and effectively protect your online presence and services from bot abuse.

1 – Sign in or sign up
The first thing you need to do is sign in to your Trustcomponent account. If you do not yet have a Trustcomponent account, you can register with us quickly and easily in just a few steps. After that, go to your dashboard. Here you will see all existing CAPTCHAs and can create new CAPTCHAs.
2 – Choose existing CAPTCHA or create a new CAPTCHA
If you already have a CAPTCHA that you want to use, skip this step. If you don't have a CAPTCHA yet, create a new CAPTCHA now.Create a new CAPTCHADuring the creation process, select the “TrustCaptcha” product category and choose your preferred pricing plan. If you are not yet sure which pricing plan to choose, no problem! The plan can be extended at any time. Then decide whether you want to start with the 30-day trial version or go straight to a paid subscription. If you want to start directly with a paid CAPTCHA, all you have to do is add your billing details and optionally a payment method and you're ready to go.30-day trial periodIf you opt for the 30-day trial period, you can test CAPTCHA for 30 days risk-free. At the end of the 30-day trial period, CAPTCHA locks itself. During the 30-day trial period or up to 30 days after the end of the trial period, you can unsubscribe from CAPTCHA at any time for a fee or delete it with immediate effect. If you neither subscribe to the CAPTCHA for a fee nor delete it within 30 days of the end of the free trial period, it will be deleted automatically.Non-Commercial PlanIn addition to our standard plans, we also offer a permanently free “Non Commercial“ plan with 1 website and up to 500 free verifications for non-commercial websites and projects.
3 – Add your websites and check your credentials
On the dashboard of your CAPTCHA you will find all the important information, statistics and setting options. Here you will also find your site-key, the secret-key and, if available, the license-key. You will need these later on when integrating your CAPTCHA.Add your websitesYour CAPTCHA may only be accessed by websites that you explicitly authorise. To allow websites to access the CAPTCHA, enter all the websites on which you want to integrate the CAPTCHA in the settings.
4 – Solve the CAPTCHA in your frontend
Integrate the CAPTCHA widget into your website or app. You can find detailed instructions for the frontend integration in our documentation. The CAPTCHA widget will then be displayed on your website or app.
Prebuild frontend integrationsYou can use one of our pre-built integrations to integrate the CAPTCHA widget into your website or application. If there is no pre-built integration from us for your preferred frontend technology, your software developers can integrate the CAPTCHA themselves using our documentation or ask our support-team for a pre-built integration solution.
5 – Validate the CAPTCHA result in your backend
When the CAPTCHA has finished, take the verification token and send it to your backend. Then retrieve the verification result from our servers and determine your next steps. You can find detailed information on backend integration in our documentation.Basic steps for GroovyThe basic steps for your Groovy integration are as follows. For detailed instructions, please read our documentation.Install Dependency
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MavenGradle GroovyGradle KotlinGradle Sbt
Test
implementation 'com.trustcomponent:trustcaptcha:2.0.0'
Fetch Result
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Fetch Result
// Retrieving the verification result VerificationResult verificationResult try { verificationResult = CaptchaManager.getVerificationResult("<your_secret_key>", "<verification_token_from_your_client>") } catch (CaptchaFailureException e) { // Fetch verification result failed - handle error }
Handle Result
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Handle Result
// Act on the verification result if (!verificationResult.isVerificationPassed() || verificationResult.getScore() > 0.5) { logger.warn("Verification failed or bot score > 0.5 – possible automated request.") }
Need more information about the Groovy integration?Here are a few more ways to familiarize yourself further with the integration.
Read the documentation
View code sample on Github
View source code on Github
View package on Maven Central
Other backend technology instead of Groovy?If you do not want to use Groovy or have several backend services you can select a different language or framework here. If there is no pre-built integration from us for your preferred backend technology, your software developers can integrate the CAPTCHA themselves using our documentation or ask our support-team for a pre-built integration solution.
6 – Congratulations 🎉
You are now protected by TrustCaptcha - congratulations!

Frequently Asked Questions

Do you need more information about the Angular integration?

Frequently Asked Questions

What is a Groovy CAPTCHA?

A Groovy CAPTCHA is a human-verification widget built to run in JVM-based applications written with Groovy or frameworks such as Grails. It renders a small script in the browser, creates a signed token, and lets your Groovy backend verify that token before processing the request. Modern providers like TrustCaptcha add automatic proof-of-work and an AI-driven bot-score so legitimate visitors rarely see any challenge at all, while malicious scripts are throttled or blocked.

What is the best Groovy CAPTCHA?

The optimal Groovy CAPTCHA combines strong security, friction-free UX, GDPR compliance and SEO-friendly structured data. TrustCaptcha stands out because it layers dynamically scaled proof-of-work with a real-time bot-score and fine-grained security settings, outperforming pure proof-of-work tools that only slow bots down. Its EU hosting and ready-made data-processing agreements simplify GDPR obligations, and its built-in FAQPage JSON-LD keeps your help content eligible for rich results even after Google’s 2023 visibility change.

How does a Groovy CAPTCHA work?

In the browser the CAPTCHA script starts a short proof-of-work task, collects behaviour signals and returns a token when the user is likely human. Your Groovy or Grails backend then posts that token to the provider’s API; the API verifies the cryptographic puzzle and checks the bot-score, responding with pass or fail. Libraries and code samples for Maven, Gradle and plain Groovy make the verification call a one-liner, so implementation typically takes minutes.

Do I need a Groovy CAPTCHA?

If your Groovy application accepts forms, log-ins or search queries from the public internet, a CAPTCHA is still one of the most cost-effective ways to stop credential-stuffing, spam and scraping bots. AI research has already shown how common CAPTCHAs such as reCAPTCHA v3 can be bypassed with machine-learning mouse simulations, so relying on multi-layered defences is now essential. TrustCaptcha’s combined proof-of-work and behavioural scoring blocks automated attacks while staying invisible for real users, which protects conversion rates and page speed.

Is TrustCaptcha GDPR-compliant for EU deployments?

Yes. TrustCaptcha stores and processes all data exclusively within the EU, offers a data-processing agreement (DPA) you can sign online and supports a minimal-data mode that runs without cookies. Independent legal reviews highlight the privacy risks of U.S.-hosted CAPTCHA services, so using an EU-based alternative like TrustCaptcha mitigates cross-border transfer concerns and makes your compliance paperwork lighter.

Can I customize the look and feel of TrustCaptcha?

Absolutely – every visual element can be tweaked: 35+ languages, light, dark or auto themes, brand-colours, rounded corners, even a fully invisible mode. You can hide TrustCaptcha branding, add your own privacy-policy link or make the widget collapse until it’s needed. These options help the CAPTCHA blend seamlessly into any Groovy or Grails UI without harming accessibility or CLS metrics.

How does TrustCaptcha keep bots out without hurting user experience?

The service first applies a fast proof-of-work puzzle that runs in the background; if behaviour looks risky, it silently increases difficulty or blocks the request. An AI bot-score analyses device and session signals, so only high-risk traffic faces tougher challenges, keeping 99 % of human visits friction-free. Compared with proof-of-work-only rivals, this multi-layer model stops sophisticated scripts while remaining practically invisible to genuine users.

More about TrustCaptcha