Investment app development: types, rules, features and cost

Investment app development is building a mobile or web product that lets people invest, get automated advice or track their portfolio. At Ronas IT, a regulated investment app with identity checks and a partner broker starts at $30,000 and takes at least 10 weeks. Before you plan features, settle two questions: who gives the advice, and who holds the money.

This guide covers four types of investment apps, the US and UK rules behind each of them, crypto apps, the features and the build steps, and the cost. If your users will pick single stocks and place their own orders, our guide to building a stock trading platform covers order flow, market data and latency in depth. Here the focus is on apps that advise, automate or track, and on self-directed apps that place orders through a partner broker.

Types of investment apps

This guide sorts investment apps into four types: robo-advisors, micro-investing apps, self-directed investing apps and portfolio trackers. They differ in what the user does and in who needs a license, and the license shapes the budget more than the number of screens does.

Use the table to screen your idea, not as legal advice: a securities lawyer confirms the model. Products can combine types. A tracker that starts suggesting trades moves toward advice, and a robo-advisor that also lets users buy single stocks adds order routing. Plan for the product you want in two years, because the license model sets the onboarding flow, the partner contracts and the data you must keep.

The rules that shape an investment app

In the US, robo-advisors are typically registered investment advisers under the Investment Advisers Act of 1940, and apps that route orders in securities generally work through a registered broker-dealer. In the UK, the FCA applies its suitability rules to automated services as it does to any advisory or discretionary firm. Each of these rules turns into screens, data and processes that you have to build. For the rules on payments and lending, see our guide to US fintech regulations.

Robo-advisors under the Advisers Act

The SEC staff's 2017 guidance on robo-advisers says they are subject to the same substantive and fiduciary obligations as any registered investment adviser. It names three areas to watch: disclosures, the information collected to give suitable advice, and a compliance program built for automated advice. In product terms, that means:

• A questionnaire that collects enough: The guidance suggests design features that alert a user when answers look inconsistent, and tool-tips or pop-up boxes that explain unclear questions.
• A warning on overrides: When a user picks a portfolio other than the recommended one, the app can explain why the recommendation may fit their stated goals better.
• Plain disclosures: Users learn how their answers turn into a portfolio, whether the answers are the only basis of the advice, and how and when to update them.
• A tested algorithm: Written procedures cover the development, testing and backtesting of the code, its monitoring after release, and telling clients about changes that may materially affect their portfolios.

SEC or state registration

According to the SEC's compliance guide, an investment adviser with less than $100 million in assets under management is, with some exceptions, prohibited from registering with the SEC and registers with one or more states instead. One exception is written for digital products: the internet adviser exemption. Under the amendments the SEC adopted in 2024, which advisers had to comply with by March 31, 2025, an adviser relying on it gives advice to all of its clients exclusively through an operational interactive website. The same guide says that the adviser's advisory staff generally can help clients with technical issues and explain how the algorithm works, but cannot expand on the advice. This limit also applies to your support chat, so the support team's scripts need to separate explaining the app from giving advice.

The broker that holds the assets

Rather than hold customer assets itself, an app can connect to a broker-dealer through its API. Alpaca, for example, documents its Broker API for building trading apps and brokerage services, and names broker-dealers and registered investment advisers among its common use cases. If the broker is a SIPC member, SIPC protects customer cash and securities up to $500,000, including a $250,000 limit for cash, when the firm fails. It protects the custody function and not the value of investments, so the app's copy must not suggest that users cannot lose money.

Suitability rules in the UK

The FCA reviewed automated investment services and found that many of the online discretionary investment management firms in its sample did not properly evaluate a client's knowledge and experience, investment objectives and capacity for loss. The FCA's suitability rules in COBS 9 and COBS 9A apply to these services, so the UK version of your questionnaire covers all three points, and your disclosures state whether the service is advised or non-advised.

Crypto investment apps: trading, staking, DeFi and prediction markets

Crypto apps answer the same two questions, who gives the advice and who holds the money, under different rules. An app that holds and transfers users' coins is a money transmitter in the US and needs a crypto-asset service license in the EU, while staking, DeFi and prediction markets each bring a rule of their own. Much of this changed in 2025 and 2026 and some of it is still being written, so a lawyer confirms the model in each market.

Crypto trading apps that hold coins

In the US, a business that transmits crypto for customers registers with FinCEN as a money services business, with no minimum activity, and needs state licenses on top. New York has its own BitLicense, and the regulator states that registering with FinCEN does not change whether a company needs it. The GENIUS Act, signed on July 18, 2025, limits who may issue payment stablecoins, coins pegged to the dollar, and bars issuers from paying holders interest. The broader market structure bill, the CLARITY Act, passed the House in July 2025 but stalled in the Senate in September 2026, so the split of crypto oversight between the SEC and the CFTC is still not set by law.

In the EU, ESMA confirmed that the MiCA transition period ended on July 1, 2026, and a firm that serves EU clients without a MiCA license after that date must stop. Since December 30, 2024, the EU transfer of funds rules have also asked crypto providers to send the sender's name and wallet address with each transfer, so the app exchanges this data with the provider on the other side. In the UK, crypto ads have followed the FCA's financial promotion rules since October 8, 2023, including a 24-hour cooling-off period for people investing with a firm for the first time, and the new UK crypto regime is expected to start on October 25, 2027. In Nigeria, the SEC first admits digital asset firms to its Accelerated Regulatory Incubation Programme, and it notes that this approval in principle is not a final license.

Staking

Staking means locking coins so they help confirm transactions on a proof-of-stake network, in return for rewards. In March 2026, the SEC and the CFTC issued a joint interpretation that sorts crypto assets into five groups and states that protocol staking does not involve the offer and sale of a security. It covers staking that the app arranges as a custodian, too. In the UK, the FCA has said that firms arranging staking must obtain authorization under the new regime. A staking feature keeps a record of each user's rewards and shows how long the coins stay locked before they can be withdrawn.

DeFi apps

A DeFi, or decentralized finance, app lets users trade, lend or earn yield through smart contracts, with coins held in their own wallets. MiCA leaves out crypto services that are provided in a fully decentralized manner without any intermediary, and the FCA plans to apply its regime to DeFi firms that have an identifiable controlling entity. A team that writes the contracts, runs the website and earns fees from them may be that entity, so a design in which users keep their own coins does not settle the license question on its own. A bug in a deployed smart contract can be hard or impossible to fix, which is why teams have the contracts audited by an outside firm before real money goes in.

Prediction markets such as Polymarket and Kalshi

A prediction market sells contracts on events, such as an election or a match, that pay out if the event happens. In the US, these are event contracts under the CFTC. Kalshi has been a designated contract market since November 2020. Polymarket paid a $1.4 million penalty in January 2022 for offering such contracts without that status, and came back to US users through QCX, an exchange the CFTC designated in July 2025 that now operates as Polymarket US. States still dispute sports contracts: New Jersey has asked the US Supreme Court to hear its case against Kalshi. A new prediction market therefore either becomes an exchange, which is a long licensing project, or lists its markets through a designated one.

For any app that moves coins, the US Treasury's sanctions guidance for the crypto industry suggests geolocation tools that block IP addresses from sanctioned places and blockchain analytics that trace where coins came from. Plan both into the backend, together with the identity checks the rest of this guide describes.

Features of an investment app

A robo-advisor or micro-investing app needs the features below; a tracker needs only some of them. The first two decide whether a user can start at all, and the last is where your compliance and support teams work every day.

• Onboarding and identity checks: KYC through a third-party provider, with manual review when an automated check is inconclusive.
• Suitability questionnaire: goals, time horizon, risk tolerance and, for the UK, knowledge, experience and capacity for loss, stored with the version of the questions the user answered.
• Funding: bank account linking and transfers into the brokerage account, with clear states for pending, completed and returned transfers.
• Portfolio view: holdings, returns and fees in plain language. For accounts held elsewhere, an aggregator such as Plaid returns holdings, securities and transactions from institutions in the United States and Canada.
• Orders or rebalancing: orders placed by the user through the broker's API, or rebalancing run by the advice engine on a schedule.
• Statements and disclosures: account statements, tax documents and the current terms, shown in the app whichever party produces them.
• Notifications: deposits, trades, rebalancing, and reminders to review questionnaire answers.
• Admin and compliance console: a queue for manual identity reviews, a log of which engine version produced each recommendation, and support tools with access limited by role.

How to create an investment app, step by step

Start with the license model and the partners, then design onboarding and the questionnaire, and only then build the rest. This is the order we follow on such projects. Our sprints usually last one to three weeks, and you can open the result of each one.

1. Pick the type and the license model. Decide with your lawyer who advises and who holds the assets, and shortlist the broker and the KYC provider.
2. Write the scope. Once your lawyer has settled the model, we turn it into user stories and flows for onboarding, the questionnaire and funding. We check that the integrations with the shortlisted broker and KYC provider are technically feasible, review the architecture and hand you a scope with a budget and a timeline. This is our analysis phase; we recommend it for a regulated app, but it is optional. The legal questions stay with your lawyer.
3. Design onboarding and the questionnaire first. Every user starts with these screens, and several of the SEC and FCA points above are about them.
4. Build the backend around the partner. Keep a copy of accounts, positions and cash, reconcile it with the broker's records, and treat the broker as the source of truth when the two differ.
5. Keep the advice engine separate. Give it its own module and version number, and backtest each version.

“When a user asks why the app moved their money, the answer should be a lookup: the answers they gave, the engine version that ran and what it decided. If you have to rerun the code to find out, you cannot explain the decision to the user or to a regulator.”

Alexander Storozhevsky, Lead developer at Ronas IT

6. Test before release. Our backend tests never call a third-party API for real: a vendor can change its interface, go down or limit requests to its test environment, and a release goes ahead only when the tests pass. End-to-end scenarios walk through funding, a first investment and a rebalance. Your compliance lead reviews the disclosures and the questionnaire copy.
7. Release to a small group first. Real deposits from a limited group show where onboarding and funding break before the public launch.
8. Maintain. Every change to the engine goes through the same tests.

Tech stack for an investment app

Our default stack for an investment app is React Native for the iOS and Android apps, Laravel with PostgreSQL for the backend, and Laravel Backpack, or Laravel Nova, for the admin and compliance console. The KYC provider, bank linking, the broker's API and a market data source connect to the backend as integrations. What this setup gives you:

• One mobile codebase: React Native builds the iOS and Android apps from one codebase, so a single team ships both.
• Live data: Laravel with Laravel Reverb sends live updates of prices, orders and balances to the app.
• Your own infrastructure: The product runs in your cloud account, set up from our Terraform modules, with separate production and development environments.

Investment app development cost

A robo-advisor, micro-investing or self-directed app with KYC, bank linking and a partner broker starts at $30,000 for one client platform and takes at least 10 weeks. A web app and an iOS and Android app together start from $45,000, because the second platform reuses the backend and costs from half of the first. A portfolio tracker that only reads data is an extended MVP: it starts at $10,000 and takes at least 5 weeks, whether it runs on the web or as one iOS and Android app, with the backend that connects the data aggregator included. The fees of the data aggregator and the other partners are paid to those providers and are not part of these prices.

Four things move the price above these starting points:

• Markets: Each new country can add its own identity checks, questionnaire and disclosures.
• Partners: Each extra provider, such as a second KYC service or a second broker, adds integration work and its own fees.
• The advice engine: Ready-made model portfolios cost less to build than logic that plans goals, combines several accounts or harvests tax losses (sells investments at a loss to reduce the tax bill).
• Mixed types: An app that both advises and lets users trade single stocks carries both sets of rules.

Every price above includes custom design and project management, and a second client platform adds from 50% of the first. For a regulated app, the written scope, yours or the result of our analysis phase, lists the third-party services your app will use and turns them into the build estimate.

What we have built

We have built three products close to this topic. Two are among our fintech projects: a stock and mutual fund app in Nigeria and a forex analytics platform in the UK. The third is a mobile app MVP for a New York forex trading company.

In Nigeria, we rebuilt a mobile app where users bought shares on the Nigerian stock market and invested in mutual funds. An audit of the client's existing app turned up serious bugs, few tests and security gaps, so we advised a full rewrite. Identity checks ran through a local government service, and after them each user answered a questionnaire about their experience with financial instruments. The app built a risk profile from those answers, as Nigerian law required. We used React Native and Laravel on AWS Kubernetes. The app launched in the App Store and Google Play in January 2025, and in January 2026 we handed the project over to the client's team.

In the UK, we built an analytics and social trading platform for forex traders. Users linked their MetaTrader accounts, compared strategies and backtested them on historical data without risking money. The first version did not trade at all; after the release, the client decided to turn it into a copy-trading platform. A change like this is why we advise settling the license model for the product you want in two years, before you build the first version.

For a forex trading company in New York that aims to help its customers automate their trading strategies, we built a mobile app MVP. It took a couple of months, according to the founder's review on Clutch.

What to do next

1. Pick your type from the table. Write down what users can do in the first version.
2. Ask a securities lawyer two questions. Who gives the advice, and who holds the assets?
3. Draft the questionnaire and the disclosures. Do it with your compliance lead, before design starts.
4. If you want a written scope before design, book an analysis phase. It is optional; ours costs $1,000-$2,000 and takes a week. We turn your type, the lawyer's answers and the questionnaire draft into user stories and flows, and you get a written scope with a budget and a timeline.

Tell us which type of investment app you plan and who your partners are, and we will send you a rough estimate for the first release.

Get an estimate