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The app was developed with support from the Metropolitan Police Child Abuse Command.
Detective Superintendent Reg Hooke said he would "commend it to all young people and professionals who work with the young."
He said: "It recognises that often their best and most immediate support comes from friends and others who see them every day.
"In this day and age, with our level of social networking and communication, no one should be suffering and be unheard and the app gives another voice to young people."
The app lists the "warning signs" to look out for in cases of forced marriage and so-called "dishonour-based violence".
At the touch of a button, the user can also be directed straight through to the emergency services.
Aneeta Prem, founder of Freedom Charity, said:
A new smartphone app, for young people at risk of being forced into marriage, has been launched today by Freedom Charity, the Government's Forced Marriage Unit and the Metropolitan Police.
The app has been designed to reach out to young people, aged 16 to 25, who are most at risk from forced marriages. It looks like a game, making it attractive to use and helping to avoid suspicion from parents. But the charity says it contains information which could be "life-saving".
Watch Freedom Charity's video about the new app below.