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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 36

The largest library features codes of free trading Expert Advisors, technical indicators and scripts. With the available applications you can trade in automated mode and analyze price dynamics. Use the library of codes to learn more about financial market sentiments.

Download free applications, test them and run in your MetaTrader 4. You can access them from the MetaTrader 4 platform and the MetaEditor development environment.


These scripts will record and file a picture of the chart at the time of each trade executed with them.

Envelopes with MaOnArray and Average True Range.

Just like internet speed test can tell you your internet speed, SpreadProbe can measure ask/bid spreads on the go.

Basic on iStochastic. Show good area price for long/short.

Trend indicator.

Simple scalping system for m1-m5 timeframe.

Alerts on two moving average(MA) cross

Alerts you on every first parabolic SAR signal in a sequence.

A simple tick data collector written in MQL4 for you to collect tick data on any symbol you choose.

A new and improved version of LineOrder

An Expert Advisor designed to open and close respective orders at the first parabolic SAR signal.

Trades using MA crosses on all timeframes.

This Ea open buy/sell positions based on Grid, no size lot optimised works well on M5

A simple signal indicator that detects MACD Main line extreme value. It filters first pike and displays all after the first.

This simple EA sends hourly status e-mail and informed of the last closed order with some additional information.

Perfect solution for newcomers at coding. Allows to implement strategies with difficult stop-management. Yes, this thing need some "baking", i.e. editing, but you will like the result; especially if the strategy is already tested with hands.

Exponential average true range reduces the lag by applying more weight to recent prices.

A very clean system by Farshad Saremifar, Based On Pivots and ATR and Moving average.

A simple way of managing orders and other features through horizontal lines.

Make big deal!

Live trade monitor that scores up to 10 EA's at once, tallying Pips, Wins, Trades, PF and profits.

Indicator displays News with a market clock.

Often times I find my chart is too cluttered with indicators to see the price action, however I still need those reference points. My solution was to create an indicator which displays the current level of some of the MA's of the current candle.

Three grades take profit Grid System, use it on weak market and fluctuating market, may need close all positions at some time.

This script is useful when you drop lines on chart and want to see the distance to current market price. You can drag line and see the distance in pips.

Basic combination of fractals, DiNapoli objectives and Fibo nodes.

Simple EA based on Alligator indicator.

GRUCHA Percentage Index

YangTrader is a good indicator, it core is price moving and return, when the value crosses 15, maybe it's the best buy time and down cross 80 it's the sell time.

Using 4 Stochastic + post-zigzag indicator(last post). The result is good!!! Profit trades (% of total --82.26%)

The post-zigzag can count the moving of zigzag line. If see many continuous post on screen, It's will more signal for changing the trend of price.

The channel indicator formed of 2 Kijun-Sen lines (Ichimoku system).

Scalping Bollinger Bands Breakout Reversals with RSI confirmation.

Just a simple script , that reads the HTML file a report , or detailed report , and draws a transaction from it on the chart

This script reads your unread GMail messages.

This uses the standard Bollinger Band calculations to further calculate the width of the Upper and Lower Bands, comparing that number to the Max and Min width of the bands for the last N periods. The results are plotted onto a histogram.

Expert advisor that trade in the trend of EMA and buy/sell signals get from Williams %R

Example of using optimization reports in an Expert Advisor.

Combines a strategy based on MA crossover with RSI and MACD confirmation by cmillion

This is the standard Heiken Ashi, but with the option to spot Dojis and color them differently.