I made something similar ( in about a week ) where all data you input is stored locally in your browser via localstorage. There's a websocket connection pushing

I made something similar ( in about a week ) where all data you input is stored locally in your browser via localstorage. There's a websocket connection pushing down real-time market data every second. https://localcoinportfolio.com https://localcoinportfolio.com It's free, open source and is about 12kb total. https://https://github.com/59023g/local-crypto-wallet https://https://github.com/59023g/local-crypto-wallet