A forex trading platform says a lot about the broker offering it. Some brokers offer MetaTrader 4, some have moved entirely to MetaTrader 5, and others build a proprietary platform from scratch. Each choice comes with real trade-offs in automation support, strategy portability, and how easy it is to switch providers later. Here is what actually separates the three, and what a broker’s platform offering should include before you commit to it.
What Is MetaTrader 4?
MetaTrader 4 (MT4) is a forex and CFD trading platform released by MetaQuotes in 2005 that became the de facto industry standard for retail currency trading. It runs on the MQL4 programming language, supports Expert Advisors for automated strategies, and defaults to a hedging model that allows opposite positions on the same instrument at once.
MT4’s biggest advantage after two decades in the market is its ecosystem. Thousands of custom indicators, scripts, and Expert Advisors exist for it, most of them free. Its biggest limitation is that MetaQuotes has stopped issuing new MT4 licenses to brokers, which means any broker offering it today is running infrastructure the platform’s own developer no longer expands.
What Is MetaTrader 5?
MetaTrader 5 (MT5) is MetaQuotes’ multi-asset successor to MT4, supporting forex alongside stocks, futures, and other instruments through both netting and hedging position modes. According to MetaQuotes’ own platform specifications, MT5 includes 21 timeframes, 38 built-in indicators, Depth of Market visibility, and a built-in economic calendar, all broader than what MT4 offers.
MT5 is the only MetaTrader platform still under active development, and it is the only one new brokers can license. Its automation language, MQL5, is not backward compatible with MT4’s MQL4, so Expert Advisors built for one do not run on the other without being rewritten.
What Are Proprietary Platforms?
A proprietary platform is trading software a broker builds and controls in-house rather than licensing from a third party. This lets a broker tailor the interface, integrate its own research and account tools tightly, and avoid MetaTrader’s licensing costs.
The trade-off is portability. A strategy, watchlist, or Expert Advisor built for a proprietary platform generally cannot move to another broker if the trader switches later, and independent tools for verifying execution quality are harder to find, since fewer traders and reviewers use any single proprietary system compared to the MetaTrader install base.
Comparison at a Glance
Why This Choice Matters More Than It Seems
Platform choice determines how locked in a trader becomes. A strategy built in MQL4 or MQL5 can, in principle, follow a trader to any broker that supports the same platform. A strategy built around a single proprietary platform’s tools cannot. That difference matters most for traders who expect to compare brokers or negotiate better terms once they have a track record, since switching costs are a lot lower on a portable platform.
If a Platform Supports Automated Trading, Vet It Before Committing
Expert Advisor and trading-robot marketplaces exist for both MT4 and MT5, and claims about their performance deserve scrutiny before real capital is involved. The CFTC’s consumer advisory on automated trading tools warns that no algorithm can guarantee returns, and that claims of unusually high or consistent win rates are a common red flag.
- Run any Expert Advisor or trading robot on a demo account for several weeks before funding it live
- Check whether performance claims come from a verified, independently hosted track record rather than the seller’s own dashboard
- Factor in the cost of the tool itself, plus any required data feed or VPS subscription, when judging real profitability
- Confirm the strategy’s logic is disclosed at least at a high level rather than sold purely as a black box
What a Broker’s Platform Lineup Should Actually Offer
A broker offering MT4, MT5, or a proprietary system should make a few things easy to verify rather than take on faith. Mobile apps should mirror desktop functionality rather than offering a stripped-down subset. Backtesting should use real historical tick data rather than lower-resolution approximations that overstate a strategy’s past performance. If Expert Advisors are supported, the broker should disclose whether any execution restrictions apply to automated orders that do not apply to manual ones. And if a proprietary platform is the only option, the broker should be transparent that switching platforms later means starting over on tools and stored strategies.
Frequently Asked Questions
Can an Expert Advisor built for MT4 run on MT5?
No, not without modification. MT4 uses MQL4 and MT5 uses MQL5, and the two languages are not directly compatible. Many popular MT4 tools have separate MT5 versions, but they are rebuilt, not simply copied over.
Is a proprietary platform ever a better choice than MetaTrader?
It can be, particularly if it integrates research, account funding, and order execution more smoothly than a generic MetaTrader setup. The trade-off is that strategies and tools built for it typically do not transfer if the trader moves to a different broker later.
Does MT5 replace MT4 for forex-only traders?
For most forex-only strategies, yes, functionally. MT5 covers everything MT4 does for currency trading and adds more timeframes and order types. The main reason to stay on MT4 is an existing library of MQL4 tools that has not been ported to MQL5.
Bringing the Platform Decision Together
None of the three platforms is universally correct. MT4 offers the deepest third-party tool ecosystem but is no longer being developed. MT5 is the actively supported, multi-asset option and the only one available to new brokers. Proprietary platforms can offer a tighter, more integrated experience at the cost of portability. What matters most is matching the platform to how long a trader expects to stay with a given broker and how much they plan to rely on automated or third-party tools along the way.