I was looking for an app that helps you practice trading, something that could replay historical candles and allow to trade on them at a point in time, kind of like a trading simulator.

We all know there is paper trading, but it has slow feedback loop - make a trade, wait for hours/days.

I wanted something that combines all the things that I'm looking for:

• Quick start in seconds - no download, install, registration, etc.
• Easy to use UI/UX.
• Minimal bias - accomplished by picking random asset/time and hiding them.
• Make trades and fast forward time for a super quick feedback/learning loop.

So I created it - TradingGYM. It's an early version, but I wanted to get the MVP out ASAP and see if this is useful to other traders as well.

The Mobile version has a more lightweight UI, but in Desktop you can change some settings like candle size and commission.

Any suggestions are very much welcome. Super interested to see if this helps anyone improve their performance.