Mind Map application

Create one application in flutter which includes 3 platforms browser, android app and IOS app. This is a reference link https://www.ayoa.com/ but only look at mindmapping part, This website has other functions like white board, team task management that is not required. Fix bid project with a strict deadline. Kindly mention the amount and time. Do not alter amount and time after chat. Bid only if you are a sincere developer/companies. Also give reference of your previous work.