Best Investing Apps for Beginners With $100 or Less

I had $100 sitting in my checking account doing absolutely nothing. Leftover from a birthday gift, I think — or maybe it was the scraps of a paycheck after rent. I remember looking at it and thinking, “That’s not enough to invest.” And I was dead wrong.

Here’s the thing: Wall Street doesn’t exactly advertise this, but you don’t need thousands of dollars to start building wealth. The barrier to entry has basically collapsed. A bunch of investing apps now let you start with as little as one dollar. So the question isn’t whether you can afford to invest. It’s which app actually deserves your money and your time.

I’ve spent months testing these platforms — comparing fees, poking around their educational resources, and figuring out which ones actually serve someone who’s just getting started. I’m going to walk you through what I found, and I’ll be honest about what I liked and what drove me nuts.

[INTERNAL LINK: building an emergency fund before investing]

What to Look for in a Beginner Investing App

Before I get into the individual apps, let me tell you what actually matters when picking a platform. The flashiest interface doesn’t always mean the best experience for your money. I learned that the hard way.

Low or zero minimums should be your first filter. If an app wants a $500 minimum deposit, it’s not built for someone starting with $100. Every app on this list lets you begin small.

Fee structure matters a LOT with limited capital. A $5 monthly fee on a $100 account is a 5% drag on your returns before the market even moves. That’s brutal. Look for apps with percentage-based fees or no fees at all.

Educational resources matter more than most beginners think. The best app in the world won’t help you if you don’t understand what you’re buying or why. I personally gravitate toward platforms that teach as you invest.

Fractional shares let you buy a piece of expensive stocks like Amazon or Tesla without needing hundreds of dollars for a single share. For small-balance investors, this is non-negotiable.

Automation features help you stay consistent — and consistency is honestly the single most important factor in long-term investing. Round-ups, recurring deposits, and auto-rebalancing take the friction out of the whole process.

1. Acorns: Best for Completely Hands-Off Investing

If you want to invest without thinking about it, Acorns is the one. They basically invented micro-investing. The idea is simple: link your debit or credit card, and Acorns rounds up every purchase to the nearest dollar and invests the spare change into a diversified portfolio of ETFs.

Buy a coffee for $4.35, and Acorns automatically invests $0.65. Sounds tiny, right? But those round-ups compound over time in ways that genuinely surprised me. I tried it for a few months and watched small change pile up faster than I expected. Many users report accumulating hundreds of dollars within their first year without ever making a conscious deposit.

Acorns gives you five portfolio options from conservative to aggressive, each built from a mix of stock and bond ETFs. You don’t pick individual stocks or make trading decisions. The app handles asset allocation and rebalancing automatically based on your risk tolerance and goals.

Pricing is straightforward. The Bronze plan costs $3 per month and includes the investment account, an IRA, and a checking account with a debit card that earns bonus round-ups at select retailers. Silver adds family features at $6 per month. Gold runs $12 per month and gets you everything plus a premium educational library and live Q&A sessions with financial experts.

Here’s my honest concern though: for a $100 starting balance, that $3 monthly fee represents 3% of your portfolio. That’s steep. But Acorns really shines when you commit to consistent round-ups and recurring deposits. Once your balance grows past $500 or $1,000, that fee becomes way more reasonable. The real value is behavioral — it forces you to invest without relying on willpower. And I don’t know about you, but my willpower around money is… inconsistent.

[AFFILIATE: Acorns]

Best for: People who struggle to save consistently and want a completely automated experience.

Starting minimum: $0 (round-ups start investing immediately)

Key drawback: The flat monthly fee eats into small balances more aggressively than percentage-based pricing.

2. Betterment: Best for Goal-Based Investing

Betterment is a robo-advisor that takes a more sophisticated approach to automated investing. While Acorns focuses on simplicity and spare change, Betterment lets you set specific financial goals and builds customized portfolios to meet them. Want to save for a house down payment in five years? Betterment will construct a portfolio with the right risk level for that timeline. Planning for retirement in 30 years? It’ll allocate more aggressively.

The platform invests your money in diversified low-cost ETFs, automatically rebalances your holdings, and performs tax-loss harvesting on taxable accounts. Tax-loss harvesting is where the app sells investments that have lost value to offset gains elsewhere in your portfolio, reducing your tax bill. This is something you’d normally only get from a financial advisor charging way higher fees.

And here’s what really sold me: Betterment charges 0.25% annually on your balance. On a $100 account, that’s just $0.25 per year. Compare that to Acorns’ flat $3/month and the math isn’t even close. As your account grows, the fee scales proportionally instead of eating a fixed dollar amount.

The educational content is genuinely good. Betterment explains every decision it makes with your money and provides articles, guides, and projections that help you understand compound interest, diversification, and risk tolerance. I wasn’t expecting to like the educational stuff as much as I did, but it actually made me a more confident investor.

Betterment also has a high-yield cash reserve account that works as a parking spot for your emergency fund while you invest separately for long-term goals. Having both in one app simplifies your financial life a lot.

[AFFILIATE: Betterment]

Best for: Beginners who want automated investing with goal tracking and tax optimization.

Starting minimum: $0 (no minimum to open an account)

Key drawback: No individual stock picking if you eventually want more control.

[INTERNAL LINK: understanding compound interest for beginners]

3. Fidelity: Best for Zero-Fee Investing

Fidelity is one of the biggest brokerage firms out there, and their mobile app has quietly become one of the best options for beginners who want to dodge fees entirely. Fidelity charges zero commissions on stock and ETF trades, has no account minimums, and offers fractional shares starting at $1. On top of that, they have their own line of zero-expense-ratio index funds. You pay absolutely nothing in ongoing fees.

Let me say that again: you can invest your $100 across a diversified set of index funds and pay zero in commissions, zero in account fees, and zero in fund expenses. No other platform on this list can match that.

The Fidelity app is more complex than Acorns or Betterment because it gives you more control. You can buy individual stocks, ETFs, mutual funds, and even options. For a beginner, this flexibility can feel overwhelming — I remember staring at the interface my first time and not knowing where to start. But Fidelity addresses this with a solid learning center that includes articles, videos, webinars, and a paper trading feature that lets you practice with fake money before risking real dollars.

Fidelity also offers retirement accounts including traditional and Roth IRAs with no minimums and no fees. If you’re starting your investing journey, opening a Roth IRA at Fidelity and contributing even $25 or $50 per month can set you up for serious tax-free growth over decades.

The one area where Fidelity falls short for absolute beginners is automation. You can set up recurring deposits, but the platform doesn’t give you the same round-up or set-it-and-forget-it experience that Acorns and Betterment do. You need to be somewhat intentional about logging in and making decisions, or at least setting up automatic purchases of specific funds. This one frustrated me a little because I wanted the zero fees AND the autopilot. Can’t have everything, I guess.

Best for: Cost-conscious beginners who want maximum flexibility and zero fees.

Starting minimum: $0 (with fractional shares starting at $1)

Key drawback: Less hand-holding and automation compared to robo-advisors.

4. Robinhood: Best for Learning to Trade

Robinhood shook things up when it launched commission-free trading in 2015. Other platforms have since matched that pricing, but Robinhood stays popular for its clean interface, fractional shares, and sheer accessibility. You can start investing with as little as $1 and buy pieces of thousands of stocks and ETFs.

The app is really good at making investing feel approachable. The design is intuitive, stock information is presented clearly, and the onboarding process is fast. I went from downloading the app to making my first trade in under ten minutes. That’s pretty wild.

Robinhood offers individual brokerage accounts, traditional and Roth IRAs with a 1% match on contributions, and a cash management account. The IRA match is a big deal — it’s basically free money for retirement savings. No other app on this list currently offers that.

But I have to be honest about the downside. Robinhood makes it very easy to trade frequently, and frequent trading is generally not how you build wealth. Push notifications about price movements, real-time tickers, easy access to options trading — all of it can push you toward a short-term mindset that works against long-term compounding. I caught myself checking my portfolio way too often when I first started using it. If you go with Robinhood, make a conscious decision to invest consistently and resist the urge to look at it every hour.

Robinhood Gold is their premium tier at $5/month, which gets you higher interest rates on uninvested cash, Morningstar research reports, and Level 2 market data. For a beginner with $100, Gold is unnecessary. Stick with the free tier until your portfolio and knowledge both grow.

Best for: Beginners who want to learn about individual stocks and trading with a clean interface.

Starting minimum: $0 (fractional shares from $1)

Key drawback: The interface can encourage overtrading and short-term thinking.

5. SoFi Invest: Best for All-in-One Financial Management

SoFi started as a student loan refinancing company and has grown into a full financial platform. SoFi Invest is their brokerage arm — commission-free stock and ETF trading, automated investing through their robo-advisor, and even crypto trading, all in one app.

What makes SoFi stand out for beginners is the integration with everything else they offer. You can manage investments, banking, loans, and credit monitoring all in one place. I personally prefer having a consolidated view of my finances, especially when I was just starting out and trying to understand my complete financial picture.

SoFi’s automated investing option works a lot like Betterment — it builds a diversified ETF portfolio based on your goals and risk tolerance. And here’s the kicker: there are no management fees. Zero advisory fees, no account minimums. For a $100 starting balance, that’s genuinely hard to beat.

The active investing side lets you trade stocks, ETFs, and crypto with no commissions. SoFi also offers IPO access, which means you can buy shares of newly public companies at the offering price. That’s typically reserved for institutional investors. While IPO investing carries real risk, the access itself is a unique perk.

SoFi puts out a lot of educational content through their app, blog, and social channels. They also host live events and Q&A sessions with financial planners, which adds a community feel that can be motivating when you’re new to this.

Best for: Beginners who want investing, banking, and financial management in one app.

Starting minimum: $0 (for both active and automated investing)

Key drawback: Crypto trading within the same app can tempt beginners into speculative positions.

[INTERNAL LINK: best budgeting strategies to free up money for investing]

6. Public: Best for Social and Educational Investing

Public takes a different approach by mixing investing with a social media-like experience. You can follow other investors, see what they’re buying and selling, and join conversations about market trends and individual companies. Think of it as half brokerage, half financial social network.

The social element is a double-edged sword, and I’ll be upfront about that. On the plus side, it creates a community of people learning together who share insights and ask questions. Public has built a culture that leans toward long-term investing over day trading, which is healthier for beginners. The platform also features live audio shows with financial experts and journalists who break down market events in real time — I’ve found a few of these genuinely useful.

Public offers commission-free trading with no account minimums and fractional shares starting at $1. They also give you access to alternative investments like fine art, collectibles, and royalties through partnerships. While these alternative assets are interesting to browse, beginners should build a core portfolio of stocks and ETFs before going down that rabbit hole.

One thing I respect about Public: their stance on payment for order flow. Unlike most free trading platforms, Public doesn’t sell your trade orders to market makers. Instead, they let you add an optional tip to trades. That means there’s no hidden cost baked into your trade execution. They’ve been pretty vocal about why this matters, and I think they’re right.

The educational content is woven into the social feed, which makes learning feel natural instead of like homework. Company profiles include analyst ratings, earnings data, and plain-language explanations of what the business does and how it makes money.

Best for: Beginners who learn best through community interaction and social features.

Starting minimum: $0 (fractional shares from $1)

Key drawback: Social features can create herd mentality around trending stocks.

7. Stash: Best for Thematic Investing

Stash takes a creative approach by organizing investments into themes instead of ticker symbols. Rather than telling a beginner to buy VTI or SCHD, Stash groups stocks and ETFs into categories like “Clean and Green” for renewable energy, “American Innovators” for domestic tech companies, or “Moderate Mix” for balanced portfolios. This helped me connect my investments to ideas I actually understood, which was nice early on.

The app offers fractional shares, so your $100 can be spread across multiple themes and individual stocks. Stash also has a banking feature called Stock-Back that rewards debit card purchases with fractional shares of stock instead of traditional cash back. Buy coffee at Starbucks and get a fraction of Starbucks stock. I’ll admit, this feature is pretty clever.

Stash pricing starts at $3/month for the Growth plan, which includes the investment account, banking, Stock-Back rewards, and financial education. The Stash+ plan at $9/month adds custodial accounts for kids, better Stock-Back rates, and monthly market insights.

Like Acorns, the flat monthly fee is my main concern for small balances. Three dollars per month on $100 is steep. But Stash compensates with the Stock-Back feature and solid automation tools. If you actually use the Stash debit card for regular purchases, the stock rewards can offset or even exceed the monthly fee.

The educational side of Stash is really well done. Every investment option includes a plain-language explanation, risk assessment, and historical context. It’s clearly built for people who’ve never invested before and might be intimidated by financial jargon — which, honestly, was me not that long ago.

Best for: Beginners who want to invest according to themes and values they care about.

Starting minimum: $0 (with fractional shares available)

Key drawback: Monthly fee is high relative to small account balances.

Head-to-Head Comparison

When you stack these apps against each other, the right choice really depends on what matters most to you.

If cost is your top priority and you want the absolute lowest fees on a $100 balance, Fidelity and SoFi Invest are your best bets. Both charge zero in commissions and advisory fees, and Fidelity’s zero-expense-ratio funds are unmatched.

If you want a hands-off, automated experience, Acorns and Betterment are the winners. Acorns is simpler with its round-up model, while Betterment offers more sophisticated goal-based planning and tax optimization. Between the two, I’d lean toward Betterment for a $100 balance because the percentage-based fee is so much friendlier than Acorns’ flat $3/month.

If you want to learn about individual stocks and eventually develop your own investment thesis, Robinhood and Public give you the tools and community to do that. Public’s social features make it the better learning environment, but Robinhood’s IRA match is a pretty compelling reason to use it for retirement savings.

If you want everything in one place, SoFi Invest ties together investing, banking, lending, and financial planning better than any other option I’ve tried.

[INTERNAL LINK: how to set financial goals in your 20s]

Tips for Investing Your First $100

Getting the right app is only half of it. Here are some things I wish someone had told me when I started.

Start immediately, but invest consistently. Your first $100 matters less than the habit of investing regularly. Set up automatic weekly or monthly deposits, even if they’re just $10 or $25. Consistency beats timing every single time over long periods. I can’t stress this enough.

Choose broad index funds over individual stocks. When you’re starting out, a total stock market index fund or an S&P 500 fund gives you instant diversification across hundreds or thousands of companies. You can explore individual stocks later once you understand the basics.

Reinvest dividends. Most apps let you automatically reinvest dividends, meaning any cash payouts from your investments buy more shares. This creates a compounding effect that speeds up your growth over time.

Don’t check your portfolio daily. Markets go up and down every single day. If you’re investing for the long term, daily price movements are noise. I check in monthly or quarterly and focus on whether I’m meeting my contribution goals instead of obsessing over short-term returns. Full disclosure: I almost quit after my first red week. Don’t be me.

Increase your contributions when your income grows. The most impactful thing you can do as a beginner investor is invest more over time. When you get a raise, a bonus, or a tax refund, throw a portion of it into your investment account before you adjust your lifestyle.

The Bottom Line

There’s genuinely never been a better time to start investing with a small amount of money. Zero-fee trading, fractional shares, educational resources, automation — anyone with a smartphone and a few dollars can start building wealth. Your $100 isn’t too small to matter. Invested consistently over decades, that initial amount combined with regular contributions can grow into something real.

The best investing app is the one you’ll actually use. Download one or two from this list, fund your account, and make your first investment this week. Don’t wait for the perfect moment or the perfect amount. The market rewards time, and every day you wait is a day of potential growth you won’t get back.

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[INTERNAL LINK: complete guide to starting your investment journey]