I have installed AppLock since 4 years ago. It’s really good for protect my privacy.
My cousins always want to play games on my phone, so I need an app to lock apps, such as WhatsApp, Messenger, Photos, etc. It can take pictures of selfie now, although sometimes not that clear, but it gives the hint about the snoopers.
And I like its themes, some of them are really beautiful.
And the support team are efficient. I hided AppLock and don’t know how to re-open it. So I sent them an email and got a reply soon.
With abundant features, it is only about 4M.