Step one
Which platform is
Which platform is
this robot for?
The rules you build are the same either way. The file you get out, the API it calls and the way it places orders are not — so pick the platform first and the builder speaks its language from here on.
No account, ever
There is no sign-up, because there is nothing to sign up to. Strategies live in this browser's local storage and in whatever JSON you export.
One file out
Every indicator that MetaTrader or cTrader does not ship is written into the file itself. Nothing else to install.
Test before you export
Drop a CSV of bars in and the same rules run in your browser first, so you find out the logic is wrong before the compiler does.