MT4 vs MT5 for EAs (2026)

"I want to start with an EA — do I install MT4 or MT5?" This is the first thing people trip on. The 2026 answer up front: if you are starting fresh with EAs, use MT5. There are several reasons, but the biggest one for choosing an EA is backtest reliability.

The decisive difference: real-tick backtesting

The single most important thing when buying or choosing an EA is whether the backtest can be trusted. Here MT4 and MT5 differ decisively.

• MT5: the "Every tick based on real ticks" model runs a high-accuracy backtest on actual tick data (history quality 99%).
• MT4: its tick model is low-accuracy, and real-tick-based verification is effectively not possible.

For thin-margin, scalping and grid EAs, this difference alone flips the backtest result (see real ticks vs OHLC). To tell whether an EA is genuine, MT5's real-tick verification is all but essential. That one point alone is a reason for an EA user to choose MT5.

Where MT5 is better for EAs

For both verifying EAs (backtest, optimization) and running them (multiple symbols and timeframes), MT5 is structurally the stronger choice.

Why MT4 is still around anyway

Even with MT5 ahead, MT4 isn't going away, for good reasons:

• Many classic EAs are MT4-only: an EA with years of MT4 track record may exist only in an MT4 build.
• Many users are settled on it: those already running on MT4 face a switching cost.
• Some brokers still center on MT4.

So it is not "MT4 is obsolete, drop it." If the EA you want exists only in an MT4 build, that is reason enough to use MT4.

The verdict

• Starting fresh with EAs → MT5 (real-tick verification, future-proof).
• The EA you want is MT4-only → MT4 is fine.
• You want to verify an EA's authenticity properly → MT5, no contest.

Given this reality, we build our main EAs for both MT5 and MT4, so you can run the same logic whichever platform you use. But if you want to verify behavior with a backtest, we recommend MT5, where real ticks are available.

Check it yourself

Our free EA (a closed-bar Donchian breakout) is distributed free in both MT5 and MT4 builds. Download it for your platform, and on MT5 run a real-tick backtest to confirm its behavior.

Donchian Trend Engine (free EA)

Every product's MT5/MT4 availability and real data is on the verification page.

Summary

• In 2026, if you are starting fresh with EAs, use MT5.
• The decisive difference is real-tick backtesting (essential to judge an EA's authenticity).
• MT5 also wins on tester speed, timeframes, instruments and cloud optimization.
• MT4 is still around because some classic EAs exist only as MT4 builds.
• If the EA you want is MT4-only, MT4 is fine; for verification, MT5 wins outright.

Related: Why real ticks vs OHLC give opposite results · MT5 backtest tick quality · How to install an EA on MT5