Alternative to the (frustrating) Recaptcha

Dear all,  I am working on a user form and so far I've used a recaptcha (Recaptcha widget) to ensure that the user isn't a robot; I've had very negative feedback from several testers because this step is very frustrating. Do you know of any alternative widgets available on Mendix? (for example, on some sites you can see basic calculations to perform or objects to rotate). Or perhaps you have another idea for implementing a more user-friendly solution? (I haven't found anything on the marketplace). Thanks in advance for any suggestion...
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