G'Day Sir,
I kindly request you to share link of apps and website with me in order to review it before disclosing my exact estimation for this project. Also if approachable, please let me know that which languages (For App - Java, Objective C, Swift, React native and for Web - CodeIgniter, laravel, yii, etc) is used for developing website and apps for better understanding.
I look forward to your swift response.
With Regards,
Manish Narola