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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 4


This is the largest free source code library for MetaTrader 5 platform programs. Here you can find ready-made Expert Advisors, technical indicators, scripts and libraries. Use the code library when learning MQL5 language and develop your own automated trading applications based on the provided codes.

You can freely download and test published codes, as well as launch them in MetaTrader 5. The library is also available directly from MetaTrader 5 platform and MetaEditor development environment.

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Shows your position size through a comment from any symbol chart based on a risk percent on daily ATR, you can use either balance or equity.

Cumulative candle, taking into account High and Low

Channel of 'N' bars at 'Low' and 'High' prices

Trend indicator. Added alerts (Sound, Alert, email, push)

Development of the first version. Added parameters 'Maximum number of positions' and 'Minimum step of positions'

The indicator shows the zones between the price crossing and the "MA" indicator

Histogram between price and indicator or between two indicators

Strategy based on the 'DeMarker' indicator, working with pending orders

The indicator shows the position of two indicators (iMA and iStochastic)

Version 2: extended functionality (added a few extra options)

A simple indicator plotting a channel with a constant range

Assistant - works on the current symbol, has the 'Trailing activate if profit is >=' parameter in the trailing parameters. Sets the initial Stop Loss and Take Profit. Closes all positions when target profit is reached

Assistant - works on the current symbol, has the 'Trailing activate if profit is >=' parameter in the trailing parameters

In a given time interval, a rectangle is constructed.

Советник-утилита. Показывает суммарную прибыль за несколько периодов (сумму и в %), количество сделок за несколько периодов. Расчёт по заданному символу и magic number

Fractals based on the iOBV indicator (On Balance Volume, OBV)

Martingale strategy based on custom indicator 'MACD Four Colors 2'

Colored Stochastic smoothed with iMA (Moving Average, MA)

Very simple indicator to plot the values of the spread[] data as reported by the OnCalculate event handler.

The indicator shows the percentage of the 'Close' price above and below the 'iMA' indicator

The color indicator shows in a separate window the moment if the intersection of two iMA (MOving Average, MA) was on the current bar

Trading strategy based on the custom indicator 'MA on Momentum'

'Momentum' indicator and 'Momentum' indicator smoothed with 'Moving Average

iDeMarker (DeMarker, DeM) indicator smoothed with iMA (Moving Average, MA).

SmoothStep (generalized)


Have you ever asked yourself why it is not possible to customize fractals more? ... now it is.

The ZigZagExtremaOnArray is an mqh include file which contains the calculation function of MetaQuotes' Examples ZigZag, BUT you can use it on any buffer that contains curves or histograms, similarly to the MovingAverages.mqh from include. The idea was to get highs and lows of an indicator curve quickly with the help of an "onBuffer" function.

The indicator compares OHLC prices

Detecting the start of a new bar or candle, in the OnTick() event handler of an expert advisor.

The indicator in the subwindow shows a comparison of High and Low prices

This simple quick & dirty script code will output a CSV file of all the Signals' properties as reported by the MQL5 Trade Signals functionality.

One of the strategies for the 'DeMarker' indicator is a permanent set of positions

Engulfing Pattern Plus One

Version 2. Indicator based on 'Chaikin Oscillator, CHO'. Line intersection of 'CHO' and 'smoothed CHO'

ADXm (experiment)

The EA works on the signals of the custom indicator 'PriceChannel_Signal_v2' ( )

iCCI (Commodity Channel Index, CCI) indicator as a colored line

Utility for copying transactions from one MT5 account or MT4 account to another MT5 account.

Trading strategy for the custom indicator 'CHO Smoothed EA'