Investment App vs Broker:
What’s the Difference and
Which Do You Actually Need?
Most people who ask this question already have their answer: they need an app. The confusion exists because brokers have spent decades making investing feel complicated, and app companies have spent years borrowing broker terminology without explaining what it means.
This guide explains the actual difference, tells you who needs which, and shows you the four investment apps we have reviewed in detail — with a direct link to our broker reviews for those who genuinely need to go further.
Last updated: July 2026 · 4 apps reviewed · ~12 min readThe Simple Answer
If you want to build a long-term portfolio of stocks and ETFs, reinvest dividends, use an ISA wrapper, and pay as little as possible in fees along the way — you need an investment app. Not a broker.
If you want to trade options, short stocks, use leverage, access futures markets, or execute complex strategies across multiple asset classes simultaneously — you need a broker.
The vast majority of retail investors fall into the first category. The financial industry has historically blurred this distinction because brokers charge commission and apps largely do not. It is in no one’s commercial interest to tell you that the simpler, cheaper product is the right one for your situation — except us.
Approximately 90% of retail investors who ask “should I use a broker?” would be better served by a commission-free investment app. The remaining 10% have specific needs — options trading, professional research tools, margin accounts, or instruments not available on consumer apps — that genuinely require a broker. If you are reading this guide to decide which to use, the probability is high that an app is the right answer.
The question is not which is better. Both serve their purpose. The question is which matches your actual investing behaviour — and for most people, that is an app.
What an Investment App Actually Is
An investment app is a consumer-facing platform designed for buying and holding stocks, ETFs, and in some cases cryptocurrency and commodities. The defining feature is zero commission on trades — you buy and sell without paying a fee per transaction. This model became mainstream around 2013-2015 and has fundamentally changed who can afford to invest regularly.
What else defines them:
- Mobile-first design — built for smartphones, with desktop as secondary. Interfaces are clean, accessible, and require no prior investing knowledge to navigate
- Fractional shares — the ability to buy a portion of a share rather than a whole one, allowing investors to access expensive stocks (Amazon, Apple, LVMH) from as little as £1 or $1
- Low or zero minimum deposit — most apps have no minimum. Some require as little as £1 to start
- Tax wrappers — UK apps offer Stocks and Shares ISAs allowing tax-free investing up to £20,000 per year. Some offer SIPPs (pension accounts)
- Auto-invest and regular investing — the ability to set up recurring investments automatically, making pound-cost averaging straightforward
The business model behind zero-commission apps is important to understand because it affects how they make money. Most earn revenue through: currency conversion fees (typically 0.15-0.45% when you buy shares denominated in a foreign currency), premium subscription tiers offering additional features, lending out securities from investor portfolios (securities lending), and in some cases payment for order flow (selling your trade data to market makers). None of these make apps bad products — but they mean “zero commission” is not the same as “free.”
Investment apps make commission-free investing accessible from £1. The hidden costs — FX fees, premium plans, securities lending — are real but modest compared to the savings on commission for long-term investors making regular purchases.
What a Broker Actually Is
A traditional broker executes trades across a wider range of instruments than any investment app offers. The difference is not price plenty of discount brokers are competitive on cost. The difference is what you can actually trade: options, futures, CFDs, forex, bonds, commodities, and usually more international markets than consumer apps carry.
Brokers come in several varieties:
- Full-service brokers — provide investment advice, research, and portfolio management alongside trade execution. Highest cost. Suited to high-net-worth investors who want professional guidance
- Discount brokers — execution-only, no advice, but access to a wide instrument range. Lower cost than full-service, higher than apps. Examples: Interactive Brokers, Charles Schwab, Saxo Bank
- CFD brokers — specialise in contracts for difference, allowing leveraged positions on stocks, forex, and commodities without owning the underlying asset. High risk, suitable only for experienced traders
The cost structure of brokers is meaningfully different from apps. Traditional brokers charge commission per trade — typically $5-10 per transaction for discount brokers, higher for full-service. They may also charge platform fees, custody fees, and inactivity fees. For a long-term investor making monthly purchases, these costs compound significantly over time compared to zero-commission apps.
Brokers provide access to instruments and markets that apps do not. That breadth comes at a cost — both financially and in complexity. Only pay for the access you will actually use.
The Five Key Differences
Side by side, the distinctions become clear. This is not a question of quality — both product categories have strong and weak examples. It is a question of what each is designed to do.
| Feature | Investment App | Traditional Broker |
|---|---|---|
| Commission | 0% ETFs · $0-2 stocks (varies by country) | $5-10 per trade (discount) — higher full-service |
| Instruments | Stocks, ETFs, some crypto & commodities | Stocks, ETFs, options, futures, CFDs, forex, bonds, commodities |
| Complexity | Low — designed for beginners | Medium to high — assumes financial knowledge |
| Fractional shares | Yes — from £1 or $1 | Often no, or limited |
| ISA / tax wrapper | Yes (UK apps) — Trading 212, Freetrade | Some offer ISAs; varies by broker |
| Minimum deposit | £0-50 — some start from £1 | Often £500-2,000+ |
| Research tools | Basic — price charts, news feed | Advanced — analyst reports, screeners, options chains |
| Leverage / margin | No (cash investing only) | Yes — margin accounts available |
| Regulatory protection | FCA/SEC regulated — FSCS/SIPC protected | FCA/SEC regulated — FSCS/SIPC protected |
| Best for | Long-term portfolio building, regular investing, beginners | Active trading, options, complex strategies, professionals |
On every dimension that matters for a long-term investor — cost, accessibility, tax efficiency, fractional investing — apps win. On every dimension that matters for an active trader — instrument breadth, leverage, research tools — brokers win. The question is which investor you are.
When You Actually Need a Broker
There are genuine use cases for brokers that apps cannot satisfy. If any of the following describe your situation, an investment app is not sufficient and you should read our broker reviews.
- You want to trade options (calls, puts, spreads)
- You want to short sell individual stocks
- You need access to futures markets
- You want to use leverage or margin
- You need access to bonds, fixed income, or forex
- You want professional-grade research and analyst reports
- You are trading at high frequency or high volume
- You need direct market access (DMA)
- You are a professional investor or managing client funds
- You are building a long-term stock and ETF portfolio
- You invest regularly — monthly or quarterly
- You want to use a Stocks and Shares ISA or SIPP
- You want to buy individual company shares
- You want to copy other investors’ portfolios
- You are investing for retirement or a long-term goal
- You want fractional shares for precise allocation
- You are new to investing and learning as you go
Some investors choose CFD brokers believing leverage will amplify their returns. It amplifies losses equally. According to FCA data, between 74-89% of retail CFD accounts lose money. CFDs are complex instruments and are not appropriate for most retail investors. If you are considering a CFD broker, read the risk warnings carefully and understand that the majority of retail accounts lose money before you commit capital.
Most people who open broker accounts for options trading never execute a single options trade. They pay broker fees for access they never use. Start with an app. Move to a broker when you have a specific need the app cannot meet not before.
The Hidden Costs of “Free” Apps
Zero commission does not mean zero cost. Investment apps generate revenue in ways that are less visible than a per-trade fee but equally real. Understanding these costs helps you choose the right app and avoid unnecessary drag on your returns.
Foreign Exchange (FX) Fees
When you buy a US stock on a UK app, the app must convert your pounds to dollars. Every app charges a fee for this conversion — it is often the largest real cost for investors buying international stocks. Trading 212 charges 0.15%, which is low. eToro charges 0.45%, which adds up meaningfully on large international positions. Always check the FX fee before assuming zero commission means truly free.
Subscription Tiers
Freetrade operates a tiered model: the free plan limits ISA access and advanced features. Standard (£5.99/month) and Plus (£11.99/month) unlock full functionality. For investors using the ISA, the £5.99 monthly fee is a real cost. At small portfolio sizes, this can represent a meaningful percentage of your invested capital. Trading 212 charges no subscription fee for any feature.
Securities Lending
Some apps lend your shares to short sellers in exchange for a fee, keeping all or part of the fee themselves. This creates a small counterparty risk — if the borrower defaults, protections apply but the process adds complexity. Trading 212 operates a securities lending programme and shares a portion of the fee with investors. Freetrade does not participate in securities lending.
The total cost of an investment app is FX fee + subscription + any premium features you use. For a UK investor buying US stocks via Trading 212, the real cost is 0.15% on each purchase — still far cheaper than a £10 broker commission. For an eToro user buying frequently, the FX conversion fee (0.5%+) and stock commissions can rival broker costs on smaller trades.
The Investment Apps We Recommend
We have reviewed four commission-free investment apps in detail. Each serves a slightly different investor profile — the cards below summarise the key facts and link to our full reviews.
For the overwhelming majority of retail investors, a commission-free investment app is the right starting point. The cost advantage over traditional brokers is significant — zero commission versus $5-10 per trade compounds meaningfully over years of regular investing. The instrument limitations only matter when you need instruments apps do not offer, and most investors never reach that point.
Start with Trading 212 if you are in the UK or EU — it is the most complete zero-fee platform available, with ISA access, fractional shares, and no subscription cost. Both Trading 212 and Freetrade offer SIPPs. Use Freetrade if you want a dedicated pension-first experience; Trading 212 if you want everything on one platform. Use eToro if copy trading or social investing appeals. Use Robinhood if you are US-based.
If after using an app for 12-24 months you find yourself wanting options trading, leverage, or instrument access the app cannot provide, that is the right time to look at brokers. Not before. We review the leading brokers at allinallspace.com/broker-reviews — read those reviews with a clear sense of what you actually need before opening an account.