MT4 vs MT5: Which Platform Should You Use for EAs?

MetaTrader 4 has been the retail standard for two decades, and MetaTrader 5 has quietly become the more capable platform for anyone building or running a portfolio of EAs. The two platforms look similar on the surface but differ in ways that directly affect how EAs are coded, tested, and executed. This guide compares them where it matters for automated traders and explains when each is the right choice, in enough detail to make the decision confidently rather than by inertia.

The Same Family, Different Machines

MT4 and MT5 are both trading platforms made by MetaQuotes, both support Expert Advisors, and both use a proprietary language (MQL4 or MQL5) for automation. Beyond that, they diverge significantly. MQL5 is not backwards-compatible with MQL4, meaning most EAs need to be rewritten (or at least ported) to move between platforms.

MetaQuotes has effectively frozen MT4 development, releasing security patches and stability updates but no significant new features. MT5 receives active development, meaning any long-term project should assume MT5 will continue to gain capabilities MT4 will not.

Direct Feature Comparison

According to the official MetaQuotes comparison of MT4 and MT5, the difference is not marginal.

Feature	MT4	MT5
Pending order types	4	6
Technical indicators	30	38
Graphical objects	31	44
Timeframes	9	21
Strategy tester	Single-threaded	Multi-threaded, multi-currency, real ticks
Depth of Market	No	Yes
Economic calendar	No	Yes
Netting accounts	No	Yes
Hedging accounts	Yes	Yes
Supported markets	Forex only	Forex, futures, options, stocks, bonds
Symbol limit	1,024	Unlimited
Order fill policies	Fill or Kill	Fill or Kill, Immediate or Cancel, Return
Partial fills	No	Yes

Where MT4 Still Wins

• EA ecosystem depth. A very large legacy library of MT4 EAs exists that has never been ported to MT5.
• Familiarity. Many long-term retail traders and third-party tools were built around MT4.
• Broker availability. Some brokers only run MT4 on their retail accounts.
• Simplicity. Fewer moving parts means less to configure incorrectly.
• Community resources. Forums, tutorials, and free indicators skew heavily toward MT4.

If your EA is only available for MT4 and works well, there is no strong technical reason to migrate purely for its own sake.

Where MT5 Wins

• Strategy tester quality. Multi-threaded, multi-currency, real-tick testing is transformative for EA development.
• More order types and fill policies provide finer control over execution behaviour.
• Multi-asset support for portfolios that include indices, stocks, or futures alongside FX.
• Better handling of large symbol lists for portfolio EAs.
• Native economic calendar and depth of market for news-aware and volume-sensitive strategies.
• Faster optimisation thanks to cloud-based agent networks.
• Ongoing development. Future platform improvements will land on MT5, not MT4.

For building or testing new EAs from scratch in the current market, MT5 is generally the stronger platform.

Hedging vs Netting

MT5 supports two account types: hedging (each position tracked separately) and netting (positions on the same instrument are aggregated). MT4 supports only hedging.

• Hedging accounts suit multi-EA portfolios and traditional retail forex use.
• Netting accounts suit institutional-style trading and instruments where a single position per symbol is the norm.

Most EAs written for MT4 rely on hedging behaviour and therefore need to run on an MT5 hedging account, not a netting one, when ported. Confirm the account type your broker offers before assuming your EA will behave as expected.

Practical Impact on EA Choice

1. If your intended EA exists only for MT4, use MT4.
2. If it exists for both, prefer MT5 for the tester and execution capabilities.
3. If you plan to trade beyond forex, MT5 is effectively required.
4. If you rely on complex portfolio EAs, MT5’s multi-currency tester saves enormous development time.
5. If your broker only offers MT4, consider whether a broker upgrade is due.

Our vetted broker comparison shows which brokers support each platform and which offer them side-by-side.

Migration Considerations

Moving an EA from MT4 to MT5 is not a copy-paste. It usually requires:

• Rewriting or converting MQL4 code to MQL5.
• Re-testing on MT5’s tester rather than trusting the MT4 backtest.
• Adjusting for the different execution and fill policies.
• Confirming hedging vs netting behaviour on the account type used.
• Rechecking any custom indicators the EA depends on.

Assume any migration is a new development project, not a settings change. Budget time accordingly, and forward-test the ported version before pointing it at live capital.

Cost and Availability of Each Platform

Both platforms are free to install. What varies is the account type each broker offers, the spreads on those accounts, and whether specific EAs are licensed for one platform only. Some paid EAs are sold as MT4-only or MT5-only with no cross-licence, which effectively narrows your broker choice.

FAQ

Is MT5 always better than MT4?
Technically usually, but the best platform is the one that supports your chosen EA and broker properly.

Can I run MT4 EAs directly in MT5?
No. MQL4 and MQL5 are different languages. Ports or rewrites are required.

Do all brokers offer both platforms?
No, but most tier-one brokers now offer at least MT5, and many offer both.

Is MT5’s multi-threaded tester really that different?
Yes. It can be an order of magnitude faster and supports realistic multi-symbol testing.

Which platform is easier for beginners?
MT4 is often perceived as slightly simpler to learn, but MT5’s modern feature set is worth the small extra learning curve.

Will MT4 be discontinued?
MetaQuotes has not committed to a discontinuation date, but new development has effectively stopped. Long-term projects should plan around MT5.

Trading foreign exchange and CFDs on margin carries a high level of risk and may not be suitable for all investors. This article is for educational purposes only and does not constitute financial advice.

Choose a Broker That Supports the Right Platform for You

The platform you can run depends on the broker you choose. See our independently vetted brokers overview to shortlist providers offering MT4, MT5, or both, with the execution quality EAs actually need.