There are five categories of "auto-investing app" in 2026. Pick by what you want to happen automatically — not by which app has the slickest ad campaign.
How we ranked these apps
Honest disclosure up front: we built Slyce. We put Slyce first on this list because it wins the specific thing we built it to win — spend-to-own with zero subscription and Trump Account support. We don't claim Slyce is best on every axis, because it isn't. If we did, this article would be a pitch, not a ranking. For every app below, we say where it legitimately wins and where it doesn't.
No money changed hands in assembling this list. No referral commissions. No "sponsored" slots. The ordering reflects our honest read on fit, not on economic incentive to rank one app over another.
Ranking criteria, in order of weight:
- Match to the auto-investing intent. Does the app auto-invest on its own, or does it require you to place trades?
- Cost structure. Subscription-based or interchange/flow-based. How much of small contributions is eaten by fees?
- Account types. Custodial, IRA, Trump Account support, and how many you can run in the same app.
- Regulatory posture. Registered investment adviser, broker-dealer, or both. Look them up before funding.
- Honest tradeoffs. We name where each app isn't great, not just where it is.
1. Slyce — spend-to-own, zero subscription
What it automates: every eligible purchase on any linked card triggers a fractional-share buy of the company you bought from. You don't place orders. You don't round up and batch. You spend, and the portfolio builds itself based on your actual shopping patterns.
Pricing: $0 per month. Slyce earns on payment-network rebates, not a user subscription.
Accounts: individual taxable + custodial (kid) + parent-directed deposits to an eligible kid's federal Trump Account[1]. No IRA at launch.
Regulatory: Slyce's investment adviser application is in progress under the Investment Advisers Act of 1940. You can look up any adviser's filing status on IAPD[2].
Where Slyce wins: the zero-subscription math compounds over time. The spend-to-own guide walks the 15-year arithmetic. Custodial accounts and Trump Account routing in one app is a meaningful setup simplification for parents in the 2025–2028 eligibility window — see the Trump Accounts guide.
Where Slyce doesn't win: pre-launch. We're newer than Grifin, we're newer than Acorns, we're newer than everyone else on this list. If "maturity of the mobile app" is your top criterion, Grifin or Acorns has more runway.
2. Grifin — the category creator
What it automates: Grifin invests in fractional shares of publicly traded brands you spend at. Interest Financial LLC is the operating entity, registered with the SEC as an investment adviser (CRD #300418)[3].
Pricing: monthly subscription — current figure on Grifin's help center[4].
Accounts: individual taxable. Grifin doesn't advertise custodial accounts or Trump Account integration as of this writing. If either has launched and we missed it, we'll update — but don't assume based on this article.
Regulatory: registered investment adviser with a live Form ADV on IAPD.
Where Grifin wins: Grifin shipped the spend-to-own category before it had a common name. The mobile app is the most mature in this niche. Supported-brand coverage is broader than any newer entrant because years of production have surfaced and fixed edge cases. If you want the most polished spend-to-own experience on the market today and the monthly fee is worth it, Grifin earns this spot.
Where Grifin doesn't win: the monthly subscription is a material drag on small portfolios. No advertised custodial, no Trump Account support. The Slyce vs. Grifin head-to-head walks the direct comparison in more detail; the Grifin-alternatives guide names four other apps worth considering.
3. Acorns — round-ups into index funds
What it automates: Acorns rounds up each card purchase to the next dollar, pools the round-ups, and invests them into a diversified ETF portfolio selected by Acorns based on your risk profile[5]. You don't end up owning the merchant — you own a piece of a broad-market fund.
Pricing: monthly subscription with tiers. Current pricing on Acorns's page.
Accounts: individual taxable, Acorns Early (custodial, higher tiers), Acorns Later (IRA), Acorns Checking.
Regulatory: Acorns Advisers, LLC is a registered investment adviser on file with the SEC (CRD #226971)[6].
Where Acorns wins: established, broadly diversified, and covers IRAs. If your plan is "invest my spare change into a passive index portfolio and also handle my retirement account," Acorns does that on one app. Over a decade of operation and a large user base give it the longest track record in the micro-investing category.
Where Acorns doesn't win: subscription costs on small balances. And Acorns is fundamentally a diversified-passive app, not a spend-to-own app — you don't end up owning the specific companies you shopped at. If that's what you want, Slyce vs. Acorns walks the mechanic comparison.
4. Stash — Stock-Back® on a debit card
What it automates: Stash's Stock-Back® card gives you stock rewards on debit-card swipes — the merchant's stock when they're publicly traded, a chosen default stock or ETF otherwise[7]. Stash also offers self-directed brokerage and managed portfolio options.
Pricing: monthly subscription by tier.
Accounts: individual taxable, Stash Retire (IRA), custodial (via Stash+).
Regulatory: Stash Investments LLC is a registered investment adviser — look up the current registration on IAPD[2] before funding.
Where Stash wins: the debit-card-plus-stock-rewards combo is a specific product shape that nothing else on this list matches cleanly. If you're willing to make the Stash debit card your primary spending card, the Stock-Back® mechanic captures rewards on every swipe. Full IRA line plus self-directed brokerage makes it a multi-purpose financial app.
Where Stash doesn't win: requires you to carry the Stash card to earn Stock-Back®. If you already have a favored cashback or points card, running Stash pulls your spending away from the program you prefer. Monthly subscription on top. See Slyce vs. Stash for the head-to-head.
5. Betterment — the robo-advisor choice
What it automates: Betterment is a robo-advisor. You deposit money, answer a brief risk-profile questionnaire, and Betterment builds and manages a target-allocation ETF portfolio for the account holder[8]. Automated rebalancing, tax-loss harvesting (on taxable accounts above a threshold), and goal-based planning are included.
Pricing: percentage-of-assets fee with a monthly minimum; current tiers on Betterment's pricing page.
Accounts: individual taxable, Traditional / Roth / SEP IRAs, joint accounts, trust accounts, 401(k) rollovers.
Regulatory: Betterment LLC is a registered investment adviser. Dedicated Form ADV citation tracked separately in our citation registry.
Where Betterment wins: if you want someone (something) else managing a portfolio against a goal — retirement, house down payment, college — Betterment is the category standard. The automation is real: daily rebalancing, tax-loss harvesting, automatic dividend reinvestment. If "I don't want to think about it and I want a professional product" is the brief, Betterment delivers.
Where Betterment doesn't win: no spend-triggered investing at all. No ownership of specific brands. The percentage-fee model is small for a $50k portfolio but noticeable for a $500 portfolio. Betterment isn't an auto-investing app in the spend-to-own sense — it's a managed robo-advisor, and that's a different product category.
6. Robinhood — the trading-platform outlier
We include Robinhood for completeness because millions of people use it and ask "is Robinhood an auto-investing app?" The answer is no — Robinhood is a self-directed brokerage[9]. Robinhood Financial LLC and Robinhood Securities LLC are broker-dealers filed with FINRA[10]. You open the app, you search for a ticker, you place orders. Nothing auto-invests without a deposit on your part.
Where Robinhood wins: if you want to trade, Robinhood is a legitimately great trading platform. Commission-free stock trades, options, margin on Gold, crypto, and a meaningful IRA product with a contribution match. Slyce vs. Robinhood walks the specifics.
Where Robinhood doesn't win: it's not an auto-investing app. If you were looking for "I want stocks to buy themselves in the background," Robinhood won't do that out of the box. It's on this list only because the search results for "best investing apps" put it here and we'd rather you understand the category distinction than let the ranking mislead you.
What nobody on this list does well
Single-stock deep research. None of these apps is a substitute for a proper brokerage research tool. If you want analyst estimates, screener tools, SEC filing browsers, or options chain analytics, you need Fidelity, Schwab, or a dedicated platform. The apps on this list optimize for automation and simplicity — not for power-user features.
Advanced tax planning. None of these apps does end-to-end tax planning across multiple accounts. Betterment does tax-loss harvesting within its own wrapper; nobody else on this list coordinates across taxable / IRA / 401(k) allocation decisions. If that's what you need, you need a CPA or a robo-advisor with a financial-planning layer.
Comprehensive 401(k) administration. Auto-investing apps aren't employer-sponsored plans. If your employer offers a 401(k) match, that's usually the highest-return dollar in your budget — capture it before layering any of these apps on top.
Verdict by persona
- Parents in the Trump Account eligibility window: Slyce. Custodial accounts + Trump Account deposit routing in one app. Grifin and Acorns both have pieces of this picture, but neither ties it together.
- Maximum app maturity, spend-to-own: Grifin. Longest track record in the category, most polished mobile app, broadest brand coverage. Pay the subscription, get the maturity.
- Set-and-forget round-ups into diversified funds: Acorns. Category default, full IRA line, longest operating history.
- Stock-Back® on a primary debit card: Stash. The one product in the list where your debit-card swipe becomes stock in the merchant. Requires committing to the Stash card.
- Managed portfolio, retirement-oriented: Betterment. Full robo-advisor experience, tax-loss harvesting, goal-based planning. Different category from the others; include on your shortlist if that's what you want.
- Self-directed trading: Robinhood. Not auto-investing by design, but if you want to trade, this is the app.
Next steps
Join the Slyce waitlist below if spend-to-own with zero subscription and Trump Account support is the fit. If you're still shopping between specific head-to-heads, the comparisons above — vs. Grifin, vs. Acorns, vs. Stash, vs. Robinhood — walk each pairing in detail. Or start with the spend-to-own guide if you're still figuring out whether the mechanic fits.
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Frequently asked
- What is the best auto-investing app for beginners?
- It depends on what you want automated. If you want every purchase to trigger a stock buy of the brand you bought from, Slyce is built for that with no monthly fee. If you want round-ups pooled into a diversified ETF portfolio, Acorns is the default. If you want a robo-advisor to manage a target-allocation portfolio with tax-loss harvesting, Betterment is the category standard. No single app is 'best' for every beginner — the real question is what you want auto-magically happening in the background.
- Are auto-investing apps safe?
- Every app on this list uses SIPC-member clearing brokers, which protects your account up to $500,000 (including $250,000 cash) if the broker fails. Registration status varies — most are registered investment advisers under the Investment Advisers Act of 1940; Robinhood is a broker-dealer via FINRA. SIPC does not protect against market losses — your shares can still go down. 'Safe' means different things: operationally safe (SIPC), regulated (registered with the SEC or FINRA), and market-risk-bearing (every app in this list).
- Which auto-investing app has the lowest fees?
- Slyce and Robinhood's base tier are both $0/month. Acorns, Stash, and Betterment charge monthly subscriptions that vary by tier — current figures are on each app's pricing page. For a small portfolio, subscription costs dominate. For a larger portfolio, the percentage drag matters less. No-fee doesn't mean no tradeoffs: the way a $0 app earns money (interchange, securities lending, order flow) is worth understanding before you commit.
- Can I use multiple auto-investing apps at once?
- Yes, and many people do. A common setup: Betterment for the long-term retirement portfolio, Slyce or Acorns for the spend-driven or round-up layer, and a traditional broker (Fidelity or Schwab) for larger, less-automated holdings. The apps don't conflict — they address different parts of a portfolio. The main downside of running many apps is administrative overhead at tax time, since every app issues its own tax forms.
- Are auto-investing apps better than a 401(k)?
- Different products. A 401(k) is an employer-sponsored retirement plan with tax advantages (and sometimes an employer match) that auto-investing apps can't replicate. If you have access to a 401(k) with a match, contribute enough to capture the match first — that's usually the highest expected-return dollar in your budget. Auto-investing apps fit alongside a 401(k), not in place of it. For non-retirement savings or for a kid's Trump Account, the comparison is more direct.
- Which app is best for investing small amounts?
- Any of them can handle small amounts — all of them support fractional shares. The meaningful differences are: (1) whether there's a monthly subscription eating into small balances (Slyce and Robinhood base are $0; Acorns / Stash / Betterment charge), and (2) whether the buys happen automatically on your spending or require you to set up deposits. At small-dollar amounts, the subscription math matters. A $3/month fee against $10/month of round-ups is a 30% drag.
- Is it worth using an auto-investing app in 2026?
- If you'd otherwise invest zero, yes — any of these apps is better than nothing. The question isn't whether to auto-invest but which pattern fits how you already spend and save. Spend-triggered (Slyce, Grifin) works for people who spend regularly and want ownership tied to that. Round-ups (Acorns) work for people who want change invested passively. Robo-advised (Betterment) works if you want a managed portfolio and don't want to think about it. Each pattern is a valid answer to the 'I should be investing more' problem.
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Published Apr 14, 2026 · Updated Apr 14, 2026