TrustCaptcha – Bot protection

Flutter CAPTCHA Integration

Add TrustCaptcha to your Flutter app to protect sign-ups, logins, and in-app forms from bot abuse and spam. Visitors verify without annoying puzzles, so more users finish and fewer drop off. EU-hosted and GDPR-ready by design.

Quickstart

How the integration works

1. Create a CAPTCHA

Create a user account or log in with an existing one. Then create a new CAPTCHA or select an existing one. If you’re unsure whether TrustCaptcha is right for you, try our CAPTCHA service risk-free for 14 days at no cost.

On the CAPTCHA overview page, you will find all the important information, such as the site key, secret key and licence key. Allow your websites to access your CAPTCHA by simply adding them to the access authorised domain list in the CAPTCHA security rules.

CAPTCHA security rules of a demo CAPTCHA.

2. Integrate the CAPTCHA widget into your frontend

At the moment, there is no pre-built integration for Flutter. However, it is still possible to use TrustCaptcha with Flutter. Your software developers can integrate the CAPTCHA widget into any Flutter app themselves using our documentation.

If you are still interested in a pre-built integration for Flutter, please contact our support team. We will be happy to help and check whether we can prioritize the development of the Flutter CAPTCHA integration.

After the integration, the CAPTCHA widget will be displayed in your Flutter app:

Other frontend technology instead of Flutter?
If you do not want to use Flutter or have several websites or applications, you can select a different framework or platform here. 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.

3. Validate the CAPTCHA result in your backend

Once the CAPTCHA is complete, take the verification token and send it to your backend. In your backend, retrieve the CAPTCHA verification result from our servers and validate the result. Depending on how high the bot risk is, you decide how to proceed. You can find detailed information on backend integration and result validation in our documentation.

Prebuild backend integrations
You can use one of our pre-built integrations to integrate the CAPTCHA validation process into your backend service. If there is no pre-built integration from us for your preferred backend technology, your software developers can integrate the CAPTCHA themselves using using our documentation or ask our support-team for a pre-built integration solution.