It is a little tough to find any decent international dating app that is free, because if it is free the app owners have a hard time vetting users and it will quickly fill up with a sea of scammers. You might try Findmate.app. The guy that runs it is obsessed with security.
If you are a woman you could take the easy road and sign up for one of the apps like Elena's Models or even one of the Anastasia sites. I believe EM is pretty easy for women, because the men pay up front and I don't think they try to follow IMBRA rules about personal info. EM also tries hard on security.
I could offer a little better advice if I knew where you were from and what your goals are. DM me if you want more specific advice.