QuanterLab: A backtesting tool for anyone with a trading idea, in Claude and ChatGPT

Hi, I'm Serhat and I run QuanterLab.

I built it because most backtests I saw looked better than they would ever trade: tuned on the same years they were judged on, or run on today's index members. QuanterLab tests a rule the way people who have paid for a bad backtest check it: point-in-time data, a walk-forward on years the rule never saw, and the result next to simply holding.

Ask for a test in plain words in Claude or ChatGPT, or build it from cards in the lab. I would like to hear which rule you test first.