Rust Captcha

A modern systems language that offers C-level performance with memory safety, perfect for reliable back-end services.Build resilient Rust back-ends with our privacy-first CAPTCHA, adding lightweight proof-of-work shields and WCAG-compliant widgets that respect user data.

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TrustCaptcha is the privacy friendly and user focused CAPTCHA for Rust

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 Rust

Integrate TrustCaptcha with Rust 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 RustThe basic steps for your Rust integration are as follows. For detailed instructions, please read our documentation.Install Dependency
Select a tab
Cargo
Fetch Result
Select a tab
Fetch Result
Handle Result
Select a tab
Handle Result
Other backend technology instead of Rust?If you do not want to use Rust 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 Rust CAPTCHA?

A Rust CAPTCHA is a human-verification mechanism implemented in or callable from Rust frameworks such as Actix, Rocket or Axum, designed to block automated traffic before it reaches your service. Thanks to Rust’s memory-safe, high-performance nature, these checks add minimal latency compared to scripting-language alternatives. TrustCaptcha offers an official Rust SDK that wraps its multi-layer endpoint—Proof-of-Work, Bot-Score and granular policies—so you can embed strong bot protection with just a few lines of code.

What is the best Rust CAPTCHA?

Choosing the “best” Rust CAPTCHA comes down to layered security, compliance, and user experience. Many open-source wrappers rely on proof-of-work alone; services like FriendlyCaptcha admit that this merely slows scripts and may let sophisticated bots pass. TrustCaptcha adds adaptive Proof-of-Work, real-time Bot-Score analysis and per-site tuning, delivering up to five-times higher blocking rates and 183 % better conversion than puzzle CAPTCHAs. Together with EU hosting and GDPR-first design, it is often the strongest all-round option for European Rust teams.

How does a Rust CAPTCHA work?

A Rust CAPTCHA typically renders a lightweight widget in the browser, lets the client complete a Proof-of-Work or risk-assessment process, then passes a signed token back to your Rust backend for verification via an HTTP call. In TrustCaptcha’s flow, the client completes an adaptive Proof-of-Work while telemetry feeds a Bot-Score engine, giving your server a numeric confidence score in milliseconds. Your Rust route simply POSTs the token to the Verify endpoint and acts on the “success”, “suspect”, or “fail” response—no heavy cryptography required in your code.

Do I need a Rust CAPTCHA?

Any public-facing Rust endpoint that accepts forms, logins or comments is a target for spam, credential-stuffing and brute-force attacks that cost organisations an average of $4.8 million per breach in 2025. Modern bot operators weaponise leaked credential databases containing billions of passwords, so latency-free defences like TrustCaptcha are essential even for high-performance Rust APIs. By adding a multi-layer CAPTCHA you cut automated abuse without degrading the speed advantages that drew you to Rust in the first place.

Is TrustCaptcha GDPR-compliant for EU projects?

Yes—TrustCaptcha is built and hosted entirely within EU data centres and ships with ready-to-sign Data Processing Agreements, making it fully GDPR-compliant out of the box. Unlike U.S.-hosted CAPTCHAs that may fall under CLOUD Act requests, all verification traffic and logs stay under European jurisdiction. This legal clarity is backed by a standard SLA guaranteeing 99.9 % uptime, so security teams can tick both compliance and reliability boxes at once.

How does TrustCaptcha combine Proof-of-Work with bot detection?

TrustCaptcha hardens the classic Proof-of-Work approach by coupling it with a behaviour-based Bot-Score engine and optional custom rules such as geo-filters or header checks. The Proof-of-Work throttles commodity scripts, while the score lets you instantly block or rate-limit suspicious traffic without slowing real users.Because each layer is configurable in the dashboard, you can adapt protection to changing threat levels without redeploying Rust code.

Does TrustCaptcha improve user experience compared to challenge-based CAPTCHAs?

TrustCaptcha runs almost invisibly: it starts when the user focuses a form field, finishes in the background and eliminates puzzle grids entirely. That design meets WCAG accessibility guidelines and reduces abandonment rates by up to 183 % compared with legacy image-selection CAPTCHAs. Custom themes, 35+ languages and optional white-label mode ensure the widget fits your branding while staying friction-free for end users.