Each guide pairs equivalent code side by side — same logic, both languages — and ships a free, original, MIT-licensed template you can run today. Demo-test everything: translation bugs are cheaper on demo.
How to use these conversions
Each guide takes one real indicator or expert advisor and rebuilds it line by line in the target language, so you can compare side by side instead of guessing what a function does. Order matters: read the MQL4 → MQL5 guide first if you are moving an old MT4 file to MT5, because it covers the fundamentals (order sending, tick handling, indicator buffers) that the other guides build on. Traders coming from TradingView should start with Pine v5 → MQL5, which maps familiar concepts — series, bars, alerts — onto their MT5 equivalents.
Every template is original, MIT-licensed and compiles as shipped. Still, a translation is only as good as its testing: attach the converted indicator to a demo chart, compare its plots and alerts against the original on the same data window, and only then consider a live account. If numbers diverge, the culprit is almost always a difference in how the two platforms count bars or handle the first bars of the series — each guide lists those exact differences.
Not financial advice. Educational conversions only — test on demo first and never risk money you cannot afford to lose.