Top libraries for MetaTrader 5 based on user ratings

Forget about BMP files like a bad dream. Thanks to this library, you can now use the PNG format, which has a number of advantages, such as being more compact without losing image quality and maintaining transparency.

A set of classes for automatic moving of StopLoss of open positions by fixed indentation or by values of Parabolic SAR and moving averages indicators, or by specified position stop level.

Four EAs on the same symbol, each one honest on its own: each checks "do I have a position?" with its own magic number, sees none, and enters. On a demo account this reached 22 contracts on a symbol meant to carry 1, and a watchdog had to close 16 positions in one morning. The cap belongs at the door, not after the fact. ExposureCap::Allowed(symbol, lots, cap) sums the volume of every open position on the symbol - all magic numbers, manual trades included - and refuses the order BEFORE it is sent when it would breach the cap. One log line with the three numbers (held, requested, cap) says why. Deliberately simple: gross exposure, no netting of longs against shorts, no per-EA quota. It is a check, not a lock: two EAs deciding on the same tick can both pass; in practice EAs on different charts decide on different ticks. The demo script prints held / cap / room for the current symbol and shows the refusal line. Nothing is traded.

Three position-sizing protections that do different things; confusing them is why so many accounts get wiped out: - ladder: one contract per X of balance, always applied as a CAP, even with manual lot sizing; - floor: below the minimum capital it does not trade; a new deposit is needed; - breaker: stops at X% below the peak, at any account size, and does not rearm by itself. What this library solves and almost none does: a deposit is not profit, and a withdrawal is not a loss. The breaker measures the drop against the balance peak. Untreated, a deposit made DURING a drawdown lifts balance and peak together, and the protection stops seeing the drop exactly when it would help. Here deposits and withdrawals shift the peak by the same amount. The peak is persisted to a file: a breaker that forgets the peak on a terminal restart is not a breaker. The demo simulates a deposit at the bottom of a drawdown. Run it with the deposit on and off and compare the "drop" column.

An include file that writes real Excel workbooks (.xlsx) from MQL5 without DLLs: several sheets, numbers, text and real Excel dates, a frozen bold header and filters. Example script: the account deals and the daily results to Excel.

Portfolio weights from the returns of symbols or Expert Advisors: inverse volatility, risk parity, hierarchical risk parity, minimum variance, maximum diversification, Ledoit-Wolf covariance.

Block bootstrap of daily results: how deep the drawdown of an account or strategy can get over the next months, with percentiles and a seeded generator for repeatable runs.

Probability of Backtest Overfitting (PBO) of an MT5 optimization by combinatorially symmetric cross-validation. Every pass sends its daily results as a frame, and the PBO is computed when the optimization ends.

Online detection of changes in the mean or volatility (Adams-MacKay): probability of a change in the last k bars, current segment length, forecast, and an indicator.

Calculate DST for USA, EUR, AUD and RUB and the offset time of the broker automatically from the 70's until 2030 - even in the Strategy Tester of MQ.

Working with keyboard data

A simple comment.

Professional Telegram Bot integration library for MetaTrader 5. Complete solution for sending trading signals, screenshots, reports, and real-time notifications to Telegram channels and groups.

A JSON library that supports MQL4/MQL5

Monitoring memory consumption.

This library is an updated version of the ErrorDescription.mqh library published by MetaQuotes, with some features included.

A powerful and feature-rich JSON library for MQL5, designed to bring a modern development experience similar to Python/JS

Complete Telegram integration for MT5. Send trading signals, screenshots, reports & alerts to Telegram channels. Includes queue system, multi-channel support & risk management.

Records ticks in real ticks mode and reads them in maths mode calling your strategy with each tick.

Source codes written in the process of developing a library for creating multi-currency Expert Advisors combining multiple instances of different trading strategies.

Compression of tick data for storage in a compact form up to 3.5 times more compact than .tcs MQ files. And for fast work with them, because reading 3 bytes takes less time than reading 60 bytes of MqlTick structure.

Profit/loss calculator of positions (open orders)

With these classes you can create and test your signals runtime.

Class to access to the local time for the specified location, as well as time zone information and the local trading session hours.

A new interface library has been developed to simplify the process of converting MT4 indicators and Expert Advisors (EAs) to MT5. This library supports most of the MetaTrader 4 functions, offering developers a unified solution for cross-platform compatibility.

Securing data transfer between client and Server could be a big challenge for you as MQL5 programmer. You may have experience in using built in MQL5 encryption systems like AES.AES can securely encrypt your data but on the other hand is not secure when it comes to sending the AES key through insecure channels. You can only rely on asymmetric encryption systems Like RSA in such cases. you keep the private key at your server side and only share the public key with your clients. Even more you can use hybrid RSA_AES approach to archive more performance

Automates MQL5 buffer and plot index management. Eliminates manual counting, simplifies Z-order layering, and handles complex plot types (Candles, Color Lines) with a single line of code.

If you have access to the Expert Advisor code, you can save balance and equity charts and calculate additional optimization criteria by adding additional code from this library.

A comprehensive stop-loss and trade management module offering multiple stop-loss methods (Fixed Pips, ATR-based, Swing High/Low, and Percentage) and trailing stop options (Fixed, ATR, Step, and Breakeven). It includes automatic broker stop-level adjustment, risk-reward–based take profit calculation, and visual stop-loss lines on the chart. The code follows a clean, structured architecture with a dedicated `CStopLossManager` class, standardized enums and structures, and fully documented English comments for clarity and maintainability.

Detects the gold symbol whatever the broker calls it, reads the contract specification from the terminal instead of assuming it, and turns a risk in account currency into a lot size that is correct for that broker.

A library of 24 MQL5 classes that watches a prop-firm rulebook -- drawdown, daily loss, payout consistency, minimum trading days, news blackout -- against any account, and flattens on breach without ever opening a position of its own.

A real economic-calendar news filter that also works in backtests. Export the events once with a script, then block new entries around news both live and in the Strategy Tester. Fixes the one-hour DST shift of historical calendar times.

Library for trading session control. At startup it counts the time of trading sessions for all 7 days of the week (on Sat and Sun there can be cryptocurrency trading), up to 10 sessions per day. Then in OnTick() you can do checks, and if a tick came in outside the trading session, you can exit further processing of it.

The source codes written during the development of the library for creating multi-currency Expert Advisors that combine many instances of various trading strategies.

PrintXYZ() library to print massive information from the terminal.

This library simulates prop trading firm scenarios by resetting the account balance based on configurable profit and loss thresholds during backtesting, and logs reset results for analysis.

Logger with the ability to log individual modules or code sections

Function to convert server time from one broker's time zone to another.

A JSON library designed for massive use of LLMs and lower latency.

Monitoring of memory leaks in the strategy tester