MT4 vs MT5: Which Is Better for Your Expert Advisor?

If you want to automate your trading on MetaTrader, the first question is often simple: MT4 or MT5? Both platforms are made by MetaQuotes, and both can run Expert Advisors (EAs). But they are not the same, and your choice changes how the EA is built.

This guide explains the main differences in simple words, so you can pick the right platform for your EA.

MQL4 vs MQL5

MT4 EAs are written in MQL4. MT5 EAs are written in MQL5. The two languages look similar, and both look a bit like C++. But they handle trades in very different ways.

In MQL4, trading is built around orders. You send an order and then work with that order until it closes.

In MQL5, trading uses three ideas: orders, deals and positions. An order is a request. A deal is the actual fill. A position is what you hold in the market.

Indicators also work differently. In MQL4, you ask for an indicator value directly. In MQL5, you first create an indicator "handle" and then copy the values you need.

The main point for a trader is simple: the code is not the same. MQL4 code cannot just be pasted into MQL5.

Strategy Tester Differences

The Strategy Tester is where you backtest an EA on past data. This is one of the biggest differences between the two platforms.

MT4 Strategy Tester:

• Tests one symbol at a time.
• Uses one processor core, so long optimizations can be slow.
• Its "Every tick" mode creates ticks from smaller timeframe data. By default, it does not use real tick history.

MT5 Strategy Tester:

• Can test EAs that trade many symbols at the same time.
• Uses many processor cores, and can also use the MQL5 Cloud Network for optimization.
• Has an "Every tick based on real ticks" mode, which uses real tick history where the broker provides it.
• Has a built-in forward test option, which checks optimized settings on a separate part of the data.

If your EA trades more than one pair, or you want more realistic testing, MT5 has a clear advantage. But remember, no backtest can tell you how an EA will do in the future.

Timeframes

MT4 has 9 timeframes: M1, M5, M15, M30, H1, H4, D1, W1 and MN.

MT5 has 21 timeframes. It adds options like M2, M3, M10, M20, H2, H3, H6, H8 and H12.

If your strategy uses a timeframe like H2 or H8, MT5 supports it directly. On MT4, the EA would need extra code to build these candles itself.

Hedging vs Netting Accounts

This difference is very important for EAs.

Hedging means you can hold many positions on the same symbol, even a buy and a sell at the same time. MT4 works this way, although some brokers limit it because of local rules.

Netting means you hold only one position per symbol. If you hold a 1 lot buy and then sell 1 lot, the position closes. If you buy more, it adds to the same position.

MT5 supports both modes. Your broker decides which mode your account uses. Many forex brokers offer hedging accounts on MT5, but always check.

Why does this matter? Grid EAs, hedging EAs and any EA that opens several trades on one pair need a hedging account. On a netting account, they will not work as planned. Tell your developer your account type before coding starts.

Broker Availability

Many brokers offer both MT4 and MT5. But MetaQuotes has been pushing brokers toward MT5 for years, and many newer brokers offer only MT5. Some brokers still focus on MT4.

MT5 can also show more markets, such as stocks and futures, if your broker offers them. It also has a built-in economic calendar.

If you trade with a prop firm, check which platform they give you, because it differs from firm to firm. If your EA must follow firm rules, like a daily loss limit, see our prop firm EA service.

Can an MT4 EA Run on MT5?

No. An MT4 EA (an .ex4 or .mq4 file) does not run on MT5. MT5 only runs .ex5 files built from MQL5 code. It does not work the other way either: an MT5 EA does not run on MT4.

To move an EA from MT4 to MT5, it must be rewritten in MQL5. The trading logic stays the same. But the code that places orders, reads indicators and manages trades must change.

After the rewrite, test the EA again in the MT5 Strategy Tester and on a demo account. Small details can behave differently, especially if your MT5 account uses netting.

If you only have the .ex4 file and not the .mq4 source code, the developer will need your written rules instead. Compiled files are not meant to be read or edited.

MT4 vs MT5 Comparison Table

Which Should You Choose?

• Choose MT5 if you are starting a new EA, you trade more than one symbol, you want more realistic testing, or your broker or prop firm uses MT5.
• Choose MT4 if your broker only offers MT4, or you already have a working MT4 EA and your broker still supports it.
• Check your account type on MT5 if your strategy holds a buy and a sell on the same symbol, or several trades on one pair. You need a hedging account for this.
• Think about Python if you want to connect your bot to other tools or data. MT5 has an official Python package, and MT4 does not. See our Python trading bot service.

For most new projects, MT5 is the more future-ready choice. But the best platform is the one your broker supports and your strategy needs.

Also remember: on either platform, an EA only follows your rules. The results depend on your strategy and the market.

How We Can Help

At Victoryalgo, we code EAs for both platforms. See our MT5 EA development and MT4 EA development services. If your strategy is on TradingView, see TradingView Pine Script or read Can You Convert a TradingView Strategy to MT5? New to EAs? Start with How to Turn Your Trading Strategy Into an MT5 EA.

Not sure which platform fits your strategy? Send us your strategy on WhatsApp for a free consultation. The Victoryalgo team will look at your rules, your broker and your account type, and tell you which platform can run your rules.

Victoryalgo is a software development company, not registered with SEBI or any financial regulator. This guide is general education about software, not investment advice. Forex and CFD trading is high risk. Indian residents may trade forex only through RBI-authorised channels.