The phrase "believable to" is correct and usable in written English.
It is usually used as an adverbial phrase, which means it is used to modify a verb. For example: The information he presented was believable to the jury.
If you answer truthfully, you are much more likely to give a consistent message that will be believable to the assessors.
She made it believable to me".
At this point it is not believable to many people".
"It's more believable to young customers to know that Christopher is involved.
The quality myth may be less believable to a younger generation of consumers.
Are the people or situations described vivid and believable to the audience?
Still, it is all intensely believable to audiences, particularly Vietnam veterans.
The have-to-work argument isn't believable to many at-home moms, either.
I did feel the reasoning was a little drastic but could be believable to a degree.
At this point it is not believable to many people," he added.
"Armando is always very keen to make it believable, to feel real.
