Dear Sir,
I have read your Project Description & as you know that you want iOS, Android & Windows Phone App, so this is definitely a big project with higher cost.
If it was only iPhone App, then we may be able to do it in Euro 5,000 but you also want Android & Windows App.
So, please let me know, if you are flexible in your set budget & if you have more detailed specs.
Just so you know, our current bid is just a placeholder to submit the proposal & start our communication.
Look forward to hearing from you.
Regards,
YK
LEADconcept