How to Build an App Like Robinhood: Commission-Free Trading, Regulatory Compliance, and What Fintech Founders Must Know

Robinhood did not invent trading. It built a better front door to infrastructure that already existed.

Behind the app is Apex Clearing, a registered broker-dealer that holds customer assets, executes trades, and handles settlement. Robinhood built the experience: the UI, the account opening flow, the real-time quotes, and the gamified portfolio view. You are building the same thing. The engineering is hard. The regulatory path is harder.

Ongoing costs after launch run $8K–$20K per month for market data feeds, clearing firm fees, and compliance tooling.

According to FINRA's 2023 annual report, there were roughly 3,500 registered broker-dealers in the US. Most retail fintech products never become one. They partner with one instead.

Who builds this instead of buying Robinhood

Most people asking this question are not trying to out-compete Robinhood for the mass market. The product is free, brand-entrenched, and backed by $5B+ in capital. The businesses that make sense are more specific.

Crypto exchanges adding equity trading. A crypto exchange with an established user base wants to offer stocks alongside digital assets. Their users already trust the platform with financial accounts. Adding US equities via DriveWealth or Alpaca is an expansion, not a new product launch. The KYC infrastructure exists; the execution layer is new.

Neobanks building investment accounts. A digital bank with checking and savings wants to retain customers by adding an investment account. The goal is not to compete with Robinhood on features. It is to keep money on the platform rather than lose it to a competing investment app. The investment product only needs to be good enough to remove the reason to leave.

Wealth management firms replacing legacy portals. A registered investment advisor or wealth management firm manages client portfolios but shows them a decade-old interface from their custodian. They want a branded client experience they control: custom portfolio views, performance reporting that matches their methodology, and client communications built in. They are not launching a consumer brokerage. They are replacing a reporting layer.

B2B tools for RIAs. A software company building tools for financial advisors needs a portfolio management dashboard that reads real-time pricing, displays client holdings, and generates compliance reports. This is not a consumer app. It is an internal tool for advisors who currently use spreadsheets and PDF reports.

"The business model of payment for order flow, combined with zero-commission trading, fundamentally changed retail investing. But it created a template that only works at scale. Smaller players need a different revenue model from day one."

-- William Birdthistle, Director of the Division of Investment Management, US SEC (remarks to the Practising Law Institute, 2022)

How Robinhood makes money -- and what your options are

Robinhood's primary revenue is payment for order flow (PFOF). Market makers pay for the right to fill Robinhood's customer orders. In 2022, Robinhood earned $974 million in revenue, with PFOF representing the majority. That model requires enormous order volume to work. At startup scale, it generates almost nothing.

Your monetization options depend on what you are building.

Subscription fees are the most defensible model for a new product. Charge a flat monthly fee for the account, premium data (options flow, earnings analysis), or advanced order types. Robinhood Gold charges $5/month for margin and Level II quotes. A niche product can charge more because it serves a specific audience Robinhood does not.

Interest on uninvested cash is available if your clearing firm offers cash sweep programs. Customers leave cash in their accounts. Your platform earns a portion of the interest the clearing firm makes on that cash. At scale, this becomes significant. At startup scale, it is negligible.

Advisory fees apply to robo-advisor models. An automated investment product charges 0.25%–0.50% of assets under management annually. This is the Betterment and Wealthfront model. It requires RIA registration rather than broker-dealer registration, which is a lighter regulatory path.

Transaction fees on crypto work cleanly. Unlike equities, crypto trading does not have a PFOF equivalent. Charging 0.5%–1.5% per trade is standard and transparent. If you are building a crypto-first product, this is the simplest path to revenue.

According to FINRA's Investor Education Foundation 2022 report, 61% of US adults owned investments in 2022, up from 52% in 2018. The market is growing. The niche products inside it are growing faster.

What features go in each phase

The failure mode in trading app builds is trying to ship everything at once. Teams scope an MVP that includes fractional shares, options trading, tax-loss harvesting, and a social feed. Six months later, nothing is live.

Phase the build. Here is what belongs where.

V1 -- launch (what you need to open the doors)

Skipping the audit logging is the most common shortcut teams take. FINRA examiners will ask for it. Retrofitting it after launch takes 6–8 weeks and costs more than building it correctly the first time.

V2 -- growth (after you've proven the model)

These features matter once you have real users and real trading volume. Adding them before that is premature.

• Fractional shares: lets customers buy $50 of a $400 stock. Opens the product to lower-account-balance customers. Cost to add post-launch: $8K–$15K.

• Watchlists and price alerts: the engagement layer that brings customers back daily. Cost: $5K–$8K.

• Recurring investments: automated weekly or monthly purchases. Customer retention feature. Cost: $7K–$12K.

• Tax documents (1099-B, 1099-DIV): year-end requirement for taxable accounts. Your clearing firm handles the calculations. Your platform generates the document download. Cost: $5K–$8K.

V3 -- scale (only relevant above certain volume)

• Options trading: separate regulatory requirements, more complex order logic, higher customer service burden. Do not add until V2 features are stable. Cost: $20K–$35K additional.

• Margin accounts: requires additional FINRA compliance work. Margin lending is a revenue opportunity but adds risk management complexity. Cost: $15K–$25K additional.

• Crypto integration alongside equities: a separate execution layer with different custody rules. Cost: $18K–$30K additional.

What the regulatory path actually looks like

This is where projects stall. The regulatory timeline is the critical path for equity products. Engineering can finish on time. The license cannot be rushed.

For self-directed equity trading in the US, two paths exist.

FINRA broker-dealer registration is required if customers will place their own trades. The application costs $5K–$50K in filing fees. Approval takes 6–18 months. You need at least one Series 7 licensed principal (handles trading oversight) and one Series 24 licensed principal (supervises operations). Seventeen states require separate securities registration on top of the federal registration. This path is necessary for a self-directed consumer trading app.

RIA registration is lighter. Customers get investment advice and automated execution. They do not click a button to place their own trades. SEC or state registration applies, depending on assets under management. This path works for advisory tools, robo-advisors, and managed portfolio products. It does not work for self-directed trading.

The practical rule: start the regulatory process the same week you start building. The teams that wait until the app is ready discover they are 12 months from launch, not 2.

Market data costs -- the recurring line item most founders underestimate

Real-time quotes are not free. The NYSE and NASDAQ charge data fees that flow through vendors to you. According to Quandl's 2023 market data pricing survey, direct exchange data licenses for major US equity markets run $1,500–$15,000 per month for institutional feeds.

Third-party vendors make this accessible. Polygon.io charges $79–$199 per month for real-time US equity data. IEX Cloud charges $19–$499 per month depending on API call volume. Alpaca combines market data with execution in one API, which simplifies your architecture.

The mistake founders make: pricing the data cost for development (where you hit a fraction of API call volume) and not for production. A product with 5,000 active daily users pulls market data at a volume that costs materially more than a sandbox test. Get the production pricing from your vendor before you finalize your unit economics.

Build vs. Robinhood: when does custom win?

Keep using Robinhood when your audience is individual retail investors with no differentiated need. Robinhood is free, reliable, and has years of trust built up. You will not out-execute them on the core retail product.

Build your own when:

• You are a crypto exchange adding US equities for existing users. Your users trust you with financial accounts. The equity product lives inside your existing experience, not competing with Robinhood from zero.

• You are a wealth manager who needs a client-facing portal that matches your specific reporting methodology and compliance documentation. Your custodian's default portal does not do this. Building a branded layer costs $50K–$90K and replaces a recurring $30K–$60K annual portal licensing fee.

• You are building for a specific niche Robinhood ignores: ESG-only portfolios, country-specific investment products for diaspora communities, employee equity management for private companies. Niche products with a specific audience can charge for access. Robinhood cannot.

• You are a B2B tools company building for financial advisors. This is not a consumer product. The audience has professional needs Robinhood's consumer interface never addresses.

Do not build if you have no distribution advantage. A new consumer trading app with no existing audience and no differentiated feature set will not attract users away from a free, established product.

What goes wrong in builds like this

RaftLabs has scoped and built fintech products for equity platforms and crypto exchanges. The pattern is consistent.

The most common failure mode: founders scope the account opening flow as a 2-week task. It consistently takes 6–10 weeks. KYC vendor integration, AML screening edge cases, state-specific disclosure requirements, and the account type selection flow (individual taxable, IRA, joint) each add time. The team that treats account opening as "just a form" will be debugging identity verification edge cases when they should be testing order management.

The second failure: teams build the portfolio view before they have stable real-time data. The portfolio chart is the product's daily driver. If it shows stale prices, customers notice immediately. Build the data feed integration first and validate it in production before building the UI that depends on it.

How RaftLabs fits in

We have built fintech products for equity platforms, crypto exchanges, and wealth management tools. We know the Alpaca and DriveWealth integration paths. We have navigated the KYC vendor choices (Jumio, Persona, and Stripe Identity each have different tradeoffs in cost and completion rate). We have built the compliance audit logging that FINRA examiners look for.

The first conversation is a scoping call where we map your regulatory path, identify your execution partner, and give you a realistic timeline. If the regulatory timeline makes your launch date impossible, we will tell you that before you start building.

Book the scoping call to scope your compliance path and build timeline.

Related reading: How to Build a Trading Platform covers institutional-grade execution infrastructure. AI Agents for Fintech covers how AI fits into fraud detection, KYC, and compliance workflows once the platform is live.