trustcaptcha

TrustCaptcha for DotNet — GDPR-compliant, privacy-first CAPTCHA

Protect websites and apps against bots and spam with a privacy-first, EU-hosted CAPTCHA solution.

What is TrustCaptcha?

TrustCaptcha combines proof-of-work, an AI bot-score and custom security rules to stop automated bot abuse — without image marking or puzzles

Key perks:

• Privacy-friendly & GDPR-compliant – data processed exclusively in Europe
• No visual challenges – users never label images or solve quizzes
• Fully themable widget – matches any brand and design and improves your user flow
• Conversion-safe – near-zero user drop-off compared to legacy CAPTCHAs

Read the full TrustCaptcha product overview for technical details and the security concept.

Get started

• Create an account: sign up / sign in.
• Choose a CAPTCHA: pick an existing one or create a new one.
• Embed the widget: implement the TrustCaptcha widget into your website or app.
• Validate result: validate the CAPTCHA verification result in your backend.

Need a walkthrough? See the DotNet integration guide.

Basic DotNet integration

• Install the dependency

dotnet add package TrustCaptcha --version 2.0.0

• Retrieve the verification result

// Retrieving the verification result
VerificationResult verificationResult;
try
{
  verificationResult = await CaptchaManager.GetVerificationResult("<your_secret_key>", "<verification_token_from_your_client>");
}
catch (Exception ex)
{
  // Fetch verification result failed - handle error
}

• Act on the result

// Do something with the verification result
if (!verificationResult.VerificationPassed || verificationResult.Score > 0.5)
{
  Console.WriteLine("Verification failed or bot score > 0.5 – possible automated request.");
}

Congratulations — you have successfully validated the result of the CAPTCHA!

For detailed implementation instructions, read the DotNet integration guide.

Other pre-built integrations

TrustCaptcha ships ready-made integrations for popular stacks:

• Platforms like WordPress, Joomla, CraftCMS or Keycloak
• Frontends like JavaScript, Angular, React or Vue.js
• Backends like Node.js, PHP, Python, Java, Ruby, Rust, Go or DotNet
• Mobile Applications like iOS, Android, React Native or Flutter

Discover all our pre-built Integrations on our website.

Get support

Questions? We will be happy to help!

• Email: [e-mail]
• Contact form: reach the support team