Why Some Investing Apps Charge a Monthly Fee (and Others Don't)

TL;DR: Free investing apps aren't actually free to run — they make money on the interest from your uninvested cash, on currency conversion fees, or (outside the UK) on payment for order flow. Paid tiers trade a flat monthly fee for better terms on those same things, plus extras like faster support. A higher price doesn't mean better investment returns; it just means a different deal on the costs underneath.

Every investing app is a piece of software someone has to build, run and keep secure, and that costs real money whether or not you ever see a bill for it. So when an app looks completely free, the question worth asking isn't "how nice of them" — it's "where is the money actually coming from, then?" Understanding the answer tells you a lot more about an app than its app-store star rating ever will.

It also connects to something you've already seen inside the Student Investor Challenge: the trading platform you use to check prices and place virtual trades is, under the hood, the same kind of product as the real investing apps on your phone. Real ones just have a business model bolted on.

Why do some investing apps charge a fee at all?

An investing app isn't a one-off purchase like a game you buy once and own forever. It's a continuously running service — live price data has to keep flowing in, your account has to stay secure, new features have to get built, and someone has to answer support tickets at 9pm when a payment doesn't go through. That ongoing cost needs an ongoing source of income to match it.

A subscription fee is the most direct way to cover that: you pay a known amount, the provider gets a predictable income, and in principle everyone can see exactly what they're paying for. The alternative is that the app earns its money in ways that are less visible to you — which isn't dishonest, but it is worth knowing about, because it changes what "free" actually means.

What do free apps get in exchange for being free?

A free-to-use investing app still needs to make money somewhere. In practice, that usually comes from a mix of three sources, and most "free" apps lean on all three to some degree.

Interest on your uninvested cash

Whenever you have cash sitting in your account that hasn't been invested yet — say, money you've just deposited but haven't bought shares with — the app provider can hold that cash and earn interest on it, the same way a bank does with money in your current account. Some of that interest gets passed back to you, and some of it is kept by the provider. The more cash sits around uninvested, and the longer it sits there, the more this adds up for the app.

Foreign exchange (FX) fees on international shares

If you buy a share listed in a different currency — a US company, for example, while your account runs in pounds — your money has to be converted. Providers typically add a small percentage on top of the real exchange rate to do that conversion, and that margin is pure profit for them. It's invisible if you only ever trade UK shares, and it adds up fast if you trade internationally a lot.

Payment for order flow — and why that doesn't work the same way in the UK

In some markets, particularly the US, a platform can be paid by a third party (a market maker) for sending them its customers' orders to execute — a practice called payment for order flow, or PFOF. It's one reason some American trading apps can offer commission-free trading at all.

In the UK, this route is largely closed off. The Financial Conduct Authority effectively banned payment for order flow for retail business back in 2012, on the grounds that it creates a conflict of interest — a platform paid to route orders a certain way has less incentive to find you the genuinely best price. Research into the UK market after the ban found the share of trades executed at the best available price rose noticeably in the years that followed. (The FCA opened a fresh review of this position in 2026, so it's a rule worth watching rather than treating as fixed forever — but as things stand, it's one monetisation lever UK investing apps mostly can't pull, which is part of why they lean more heavily on cash interest, FX fees and subscriptions instead.)

A real example — what a UK app's paid tiers actually buy you

It's easier to see all this in a real set of numbers than in the abstract. Freetrade, a UK investing app, publishes three tiers on its pricing page: a free Basic plan, a Standard plan at £4.99 a month (or £59.88 a year), and a Plus plan at £9.99 a month (or £119.88 a year). This isn't a recommendation to use Freetrade specifically — it's simply a real, published example of how the free-vs-paid trade-off actually looks in practice.

The pattern across the three tiers is consistent: as the monthly fee goes up, the FX fee on international trades goes down, and the interest rate paid on uninvested cash goes up (along with the amount of cash it applies to). Higher tiers also add things like priority customer support and access to more advanced order types.

What you get	Free (Basic)	Paid (Standard / Plus)
FX fee on international shares	Higher (around 0.99%)	Lower (as low as 0.39% on the top tier)
Interest on uninvested cash	Lower rate, smaller cash limit	Higher rate, larger cash limit
Support & order types	Standard support, basic orders	Priority support, more order types (e.g. limit, stop-loss)

Figures above reflect Freetrade's published pricing as of this article's publication date; providers change pricing and plan details over time, so always check the current live pricing page rather than treating any single snapshot as permanent.

Freemium vs subscription — what's actually different?

Two business models sit behind almost every "free" app you've ever used, and they work quite differently. A pure freemium model gives everyone the full core product for free and tries to monetise a small slice of users some other way — often, as above, through interest on cash or FX fees rather than a sign-up fee at all. A subscription model instead asks a defined group of users to pay a recurring fee for a defined set of extra features or better terms, and treats that fee as the main source of income, not a side one.

Most investing apps today actually run a hybrid of both: a genuinely usable free tier (freemium) sitting underneath one or more paid tiers (subscription), stacked on top of the background cash-interest and FX income that's quietly there regardless of which tier you're on. Whichever model a company leans on, building and maintaining a product like that at scale isn't a weekend project — it takes a team that specialises in building subscription-based SaaS products, because the billing, the tiered permissions and the live financial data all have to work together reliably, every single day, with real money on the line.

Does a more expensive app mean a better one?

Not automatically, and this is worth being clear-eyed about. A higher monthly fee buys you better terms on specific things — lower FX fees, more interest on spare cash, faster support, extra order types — not a better underlying investment strategy, and definitely not a guarantee of higher returns. The shares you buy perform exactly the same whether you bought them through a free app or a £9.99-a-month one; the app doesn't influence the market.

What the fee is really worth to you depends entirely on how you'd actually use it. Someone who trades international shares often, or who keeps a meaningful amount of cash sitting in their account, can genuinely save more in FX fees and earn more in interest than the subscription costs them. Someone who trades occasionally and sticks to UK shares might get very little extra value from the same paid tier. There's no universal "better" app here — only a better fit for how a particular person actually uses it.

What this means for you as an investor

None of this is a reason to distrust free apps, or to assume a paid one is automatically worth it — it's a reason to read past the headline price. When you're older and actually choosing a real investing app, it's worth looking past "free" or "£X.99 a month" and asking what each tier includes: the FX fee, the cash interest rate, the order types, the support. That's the information that tells you what you're actually getting, in a way the price tag alone never will.

For now, inside the Student Investor Challenge, none of this touches you directly — the whole point of the virtual £100,000 portfolio is to let you practise reading markets and making decisions without any fees, real or hidden, getting in the way. But understanding how the apps behind real investing actually make their money is exactly the kind of practical, grown-up knowledge that's worth picking up early.

Frequently Asked Questions

Is a free investing app less safe than a paid one?

Not necessarily. Safety mostly comes down to regulation — whether the firm behind the app is properly authorised and protects client money the way it's required to — not whether you pay a subscription. A free tier and a paid tier from the same regulated provider usually sit on exactly the same safety rails; the fee buys convenience and better terms, not protection.

Why don't trading apps in the UK make money from payment for order flow like some US apps do?

The UK's financial regulator banned payment for order flow for retail trades back in 2012, because it creates a conflict of interest — a platform could be tempted to route your order to whoever pays it the most, rather than to wherever gets you the best price. US rules have historically allowed it, which is part of why some American apps can offer commission-free trading. UK apps have to make their money other ways instead.

Do subscription fees affect how much I actually earn from investing?

A subscription fee is a cost, so in theory it does eat into your returns a little — but a well-chosen paid plan can also lower other costs (like foreign exchange fees) or pay you more interest on cash, which can offset it depending on how you use the account. There's no single right answer; it depends entirely on how much and how often you trade.

Can an app change its pricing after I've signed up?

Yes. Investing apps, like almost any subscription software, can and do change their pricing or what's included in each tier over time, usually with advance notice to existing customers. It's worth treating any pricing you see today as the current snapshot rather than a permanent promise.

Key Takeaways

• "Free" apps still make money — usually from interest on your uninvested cash and FX fees on international trades.
• UK apps can't lean on payment for order flow the way some US apps do, because the FCA banned it for retail trades in 2012.
• Paid tiers buy better terms on cash interest, FX fees and support — not better investment performance.
• A more expensive app isn't automatically a better one; it depends on how you'd actually use the extras.

Next time you see one investing app that's free and another asking for a monthly fee, you'll know they're not really selling different things — they're just collecting the bill in different places.