Friendly Captcha for
Flutter
Flutter is an open source framework from Google for building natively compiled, cross-platform applications from a single code base. Secure your Flutter app with a privacy-first Flutter captcha solution from Friendly Captcha. Prevent spam, protect user data, and ensure invisible verification.
Field of application/
Mobile Apps
Tired of clicking on cars?
Friendly Captcha is the user-friendly way to stop spam and bots - no labeling needed.
Get rid of annoying labeling tasks. Make spam protection easy and privacy compliant.
Happy users, increased conversion rates
With Friendly Captcha no user tasks are needed. It runs automatically in the background.
Fully accessible and WCAG compliant
Don’t exclude any users, Friendly Captcha is entirely barrier-free.
Privacy compliant with GDPR, CCPA, LGPD and PIPL
Friendly Captcha protects users’ privacy at the highest level of data protection.
European servers for maximum data protection
Ensure that your customers’ personal data remains in the EU.
The Flutter Captcha
How the integration works
1.
Create a Friendly Captcha account
Creating an account is completely free, all you need is a valid email address and you’re ready to go. Choose a plan that covers your needs. The first 30 days are free of charge.
2.
Create an 'Application' to get a sitekey
Create an application in the Friendly Captcha dashboard to get a sitekey for your integration, as shown in the screenshot below.
3.
Create an API key to interact with the API
Create an API key in the Friendly Captcha dashboard, as shown in the screenshot below.
Please make sure to copy and save the API key as you can only access it once.
4.
Complete your billing details
To ensure that your account remains functional after the 30-day trial period, make sure to enter your billing information in the Friendly Captcha dashboard.
You can adjust and cancel your Friendly Captcha plan online at any time.
5.
Integrate the source code to your Flutter app
Share the integration code with your developer via the link below to integrate Friendly Captcha into your Flutter app.
https://github.com/FriendlyCaptcha/friendly-captcha-flutter-example
6.
Connect Friendly Captcha with Flutter
To finish the integration, share with your developer the sitekey generated in step 2 and the API key generated in step 3.
The Friendly Captcha widget will appear in your Flutter frontend.
FAQs
A Flutter CAPTCHA is essential for verifying human interaction with your iOS or Android applications. To achieve this, traditional CAPTCHA providers like Google reCAPTCHA use image recognition challenges or extensive user tracking. Modern CAPTCHA solutions like Friendly Captcha take a completely different proof-of-work approach, while maintaining the highest standards of privacy compliance, security, and user experience.
Friendly Captcha for Flutter applications operates by challenging the user’s device in the background to distinguish between human user interaction and automated bots. Without an intrusive CAPTCHA challenge, Friendly Captcha maintains the security and accessibility of your Flutter app.
Friendly Captcha stands out as the optimal CAPTCHA solution for Flutter applications. Using a proof-of-work approach, it provides an innovative, invisible and privacy-friendly mechanism that is ideally suited for iOS and Android. It relies on cryptographic puzzles that are automatically solved in the background by the user’s device. Bots can only solve these challenges at a too high computational cost. This provides robust security against bots and spam without compromising the user experience.
To verify that the Flutter CAPTCHA integration is working properly, check out this step-by-step manual from our support website.
Securing your Flutter application against unauthorized access, spam and bot attacks often involves adding a CAPTCHA. This is especially important for applications that manage sensitive data or require frequent user interaction. Choosing a modern CAPTCHA solution like Friendly Captcha provides robust security without burdening users with complicated image recognition challenges. With an invisible CAPTCHA, there’s no need to click traffic lights or solve puzzles like with Google reCAPTCHA.
Using a CAPTCHA in your Flutter applications is a reliable way to defend against bots and spam attacks. Ideally, the CAPTCHA solution should comply with privacy regulations such as GDPR or CCPA, protecting user data while remaining user-friendly and accessible to all, including people with disabilities. Friendly Captcha is the best CAPTCHA choice for Flutter. The modern CAPTCHA combines strong security measures with an effortless user experience, making it an excellent option for mobile app development.
No, not all Flutter CAPTCHAs are accessible. Despite the WCAG recommendations and the European Accessibility Act (EAA) with its commitment to accessible websites by June 2025, there are still too many CAPTCHA providers with image-based or text-based CAPTCHA challenges. These challenges exclude too many people with different disabilities.
A fully accessible and WCAG compliant CAPTCHA for Flutter is provided by Friendly Captcha. Using the proof-of-work approach, the user device invisibly solves a cryptographic background puzzle. No human is required to click on traffic lights on images, and bots can only solve this task with too much computational effort and are therefore filtered out. As a result, Friendly Captcha effectively protects Flutter applications from malicious activities and is accessible to everyone.
Ready to get started?
Join thousands of organizations in switching to a privacy-first anti-bot solution. We protect your websites and online services with the highest German quality and data protection standards.
Privacy matters
Learn more about our commitment to protect your users' privacy.
Start your integration
Adding Friendly Captcha takes only minutes and just a few lines of code.
