Scala Captcha

A JVM language that fuses functional and object-oriented paradigms, excelling in data-intensive and distributed systems.Stop automated abuse in Scala or Akka stacks with TrustCaptcha’s privacy-friendly CAPTCHA—proof-of-work secured and fully customizable.

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TrustCaptcha is the privacy friendly and user focused CAPTCHA for Scala

Security & Bot-ScoreTrustCaptcha combines a proof-of-work with a bot score — similar to the reCAPTCHA score — and custom security configurations for maximum security. Learn more about the CAPTCHA security concept

Privacy Friendly & GDPR-CompliantTrustCaptcha is a privacy-first CAPTCHA solution with a clear focus on data protection and GDPR compliance. Learn more about the GDPR-compliant CAPTCHA

CustomizationAll features of the CAPTCHA widget are fully customizable such as translations or design. The branding or the entire widget can also be hidden. Learn more about the customization

AccessibilityThe CAPTCHA completely dispenses with puzzles or image marking tasks. The CAPTCHA works fully automated and complies with international accessibility standards. Learn more about the accessibility

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Integrate TrustCaptcha in Scala

Integrate TrustCaptcha with Scala 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 trail 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 ScalaThe basic steps for your Scala integration are as follows. For detailed instructions, please read our documentation.Install Dependency
Select a tab
MavenGradle GroovyGradle KotlinGradle Sbt
Fetch Result
Select a tab
Fetch Result
Handle Result
Select a tab
Handle Result
Other backend technology instead of Scala?If you do not want to use Scala 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!

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Frequently Asked Questions

What is a Scala CAPTCHA?

A Scala CAPTCHA is a challenge-response mechanism embedded in a Scala or Akka application that separates real visitors from automated scripts. It typically runs a lightweight client widget and validates the resulting token on your Scala backend. Modern solutions such as TrustCaptcha automate the proof-of-work behind the scenes so end-users hardly notice anything. They also respect EU-level security and privacy standards.

What is the best Scala CAPTCHA?

The “best” CAPTCHA balances airtight security, GDPR compliance, developer ergonomics, and a friction-free user experience. In 2025 many teams choose TrustCaptcha because its multi-layered proof-of-work plus AI-driven bot-score blocks even advanced bots while keeping data in the EU. Pre-built Scala libraries, a generous free tier, and fine-grained styling options cut integration time to minutes. Whatever provider you pick, make sure it offers EU hosting and an online DPA.

How does a Scala CAPTCHA work?

On the client side the widget silently solves a cryptographic puzzle and gathers risk signals, then returns a signed token. Your Scala controller posts this token together with your site-key and secret-key to the CAPTCHA API and receives a JSON verdict with the bot probability. With TrustCaptcha you can tune thresholds, IP allow/deny lists, or create bypass keys for automated tests. All traffic is TLS-encrypted, so no sensitive data leaks in transit.

Do I need a Scala CAPTCHA?

If your Scala site exposes forms, authentication flows, or public APIs, a CAPTCHA is still the simplest first line of defence. Recent reports show that bots already generate more than a third of all web traffic and 89 % of that traffic is unwanted, with e-commerce and content platforms hit hardest. A privacy-first CAPTCHA such as TrustCaptcha blocks these attacks without frustrating humans or screen-reader users. For purely internal apps you might rely on rate-limiting, but public endpoints benefit from layered protection.

Is TrustCaptcha GDPR-compliant for EU projects?

Yes. TrustCaptcha stores and processes CAPTCHA data exclusively in EU data centres and never sets tracking cookies. You can conclude a Data Processing Agreement (DPA) and Service-Level Agreement entirely online within minutes. An optional “Minimal Data Mode” is available for projects that need to minimise personal data even further.

Can I customise the look of TrustCaptcha in my Scala app?

Absolutely. TrustCaptcha lets you switch between light, dark or auto themes, override any colour and hide the branding for a white-label experience. You can also supply your own translations for 35 + languages, adjust width or corner radius and even make the widget invisible while it runs. All options are simple HTML attributes or JavaScript flags, so they work with Scala.js, Play templates or any front-end stack.

How does TrustCaptcha improve accessibility over image-based CAPTCHAs?

Traditional CAPTCHAs force users to decipher distorted text or click tiny images—an obstacle for screen-reader and keyboard users. TrustCaptcha’s automated proof-of-work begins as soon as the form gains focus and finishes in seconds with no puzzles, meeting WCAG 2.2 guidelines. Because there is nothing to solve visually, users with disabilities encounter almost zero friction. That boosts conversion rates while still blocking bots.