Building and testing happen inside Profectus, in your browser.
There is a backtester built into the platform, so you can run an idea against years of historical data in a few clicks. Nothing to install, nothing to configure. It works the same on a Mac, an iPad or a Windows machine. See How to backtest on Profectus.AI.
MetaTrader 5 comes in later, when you want to run your trading system live on your broker account. MetaTrader does not run natively on Mac, so that step needs a small workaround. Building and testing do not.
macOS & iOS – Build and backtest in any browser. For live trading, see Running your trading system on a Mac.
Windows – Fully supported on any laptop or computer with an internet browser.