FinPal
This is a very complete app where you can manage simple finance, after you create an account, you may add/edit/delete: Incomes, Expenses, Debts or Stock. There's a month filter, as well as a dark-mode and a language switch between english and spanish. It has a simple yet modern flat design made with SasS and few animations made with framer-motion. React's state was worked with Redux, finally I implemented Firebase as backend. On Login there's a Demo button to view the app without creating an account. Responsive design.
Link to app: FinPal