What to know
- Create a new MQL4 indicator file before pasting source.
- Compile in MetaEditor and read every warning.
- Apply to a demo chart first.
- Check broker feed differences, especially volume and session behavior.
MT4 strengths
MQL4 is a good fit for simple chart indicators, overlays, buffers, and copy/paste examples traders can modify.
Volume caution
Many MT4 feeds provide tick volume rather than centralized exchange volume, so volume-based indicators need careful interpretation.
Porting note
MT4 and MT5 are not interchangeable. MQL4 examples should be treated separately from MQL5 versions.
How to use this page well
The quickest way to get value from a platform page is to decide whether you are here for installation, source code, or workflow guidance. Those are related, but they are not the same job. Download-oriented pages help you get something working. Source-oriented pages help you inspect and adapt logic. Workflow pages help you decide whether a tool deserves a place on the chart at all. Keeping those jobs separate makes the site much easier to navigate.
That separation is especially important when you are moving between platforms. A trader who comes in through MetaTrader may still end up on a product page, a source page, a guide, or a glossary entry before the question is fully answered. This hub exists to make that path shorter and less confusing.