Черт, а ты оказался прав, я просто доку по hive не дочитал!!! Урра товарищи, остаемся на флаттере !!!
Hive works in the browser exactly the same as in the VM. The only difference is how your data is stored. Since the browser has no file system, Hive uses IndexedDB as the storage backend. Every box is stored in its own IndexedDB database. You don't have to care about that; everything works as usual.