Hey there, After a few years of making this account, I think it's time I start properly using it.
So, I am Hannan, a software developer, interested in web, javascript and more
Captchas are hard on mobile and in many cases unaccessible. You should have rate limiting on the server side or use more friendly options such as 2FA or Phone Verification, really don't implement captcha if you want to give your users a better experience and save them from unnecessary hassle.
They are used on the webpages because there are many crawler and bots on the web to automate things, on mobile it's going to be a lot more harder and since you fully control the app experience you can easily block the user from sending anymore requests for a certain period of time.
TLDR: Don't do captchas please :)
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Captchas are hard on mobile and in many cases unaccessible. You should have rate limiting on the server side or use more friendly options such as 2FA or Phone Verification, really don't implement captcha if you want to give your users a better experience and save them from unnecessary hassle.
They are used on the webpages because there are many crawler and bots on the web to automate things, on mobile it's going to be a lot more harder and since you fully control the app experience you can easily block the user from sending anymore requests for a certain period of time.
TLDR: Don't do captchas please :)