Indicators are the building blocks of most trading strategies, and MetaTrader 5 lets you build your own with MQL5. If you have searched for an MT5 RSI indicator, QQE, a Nadaraya Watson envelope or a trend indicator, this guide explains what they do and where to get editable source code you can study and customize.
Popular MQL5 indicators worth studying
- RSI (Relative Strength Index): a classic momentum oscillator. Great first indicator to read in MQL5 because the math is simple and the code is short.
- QQE (Quantitative Qualitative Estimation): a smoothed RSI based indicator used for trend and momentum signals.
- Nadaraya Watson envelope: a smoothing method that draws dynamic bands around price, popular for spotting reversals.
- Trend indicators: moving average and slope based tools that colour the trend direction.
Why get the source code
A compiled indicator (.ex5) just draws lines. With the source (.mq5) you can see how the values are calculated, change the settings, combine it with other logic, or feed its signals into an Expert Advisor. That is how custom strategies are born.
How to use an MQL5 indicator source file
- Copy the
.mq5into yourMQL5Indicatorsfolder. - Open it in MetaEditor and press Compile (F7).
- Refresh MetaTrader and drag the indicator onto a chart.
Get free indicator source code
Our free source code library includes editable EAs and indicators you can open, compile and modify in MetaEditor. It is the fastest way to learn how indicators like RSI and QQE are actually built. When you want to go further, our premium source code and MQL guides take you the rest of the way.