Acorns vs. Stash vs. Betterment: Which Micro-Investing App Grows Your Money Faster?

A $100 balance on the wrong app can quietly cost you 12% a year in fees. Pick the right one, and that same $100 grows completely fee-free. Here is exactly which app wins at every balance level.

Jump To

1. Acorns: Best for Hands-Off Round-Up Investors 2. Stash: Best for DIY Investors Who Want Control 3. Betterment: Best Once Your Balance Passes $14,400 Side-by-Side: Fees and Features Visual Content Suggestions for Design Team Related NMF Reads Frequently Asked Questions Sources

Micro-investing apps promised to make investing easy for beginners, and they delivered. But Acorns, Stash, and Betterment charge you in completely different ways, and the one that is cheapest for your best friend might be the worst deal for you. This breakdown shows you exactly where each app wins, so you can stop guessing and start compounding.

QUICK WINS SUMMARYTotal Potential Savings: Up to $180+ per year in avoided feesTime Investment: 10 minutes to open the right accountDifficulty Level: Beginner-friendlyBest For: Anyone with under $10,000 to invest who wants to stop overpaying in fees

1. Acorns: Best for Hands-Off Round-Up Investors

Acorns rounds up your everyday purchases to the nearest dollar and invests the spare change automatically. Buy a $4.50 coffee and $0.50 gets invested into a diversified ETF portfolio without you lifting a finger. The Personal plan costs a flat $3/month, and Acorns also matches 1% to 3% of your new IRA contributions during your first year.

Example: A Gold Plan customer who maxes out the $7,500 IRA limit in 2026 gets a $225 match, more than covering the $144 annual subscription with $81 left over.

Action: Link your everyday debit card to Acorns and turn on Round-Ups today. Add a $5/week recurring deposit to speed things up.

2. Stash: Best for DIY Investors Who Want Control

Stash charges the same flat $3/month as Acorns, but instead of a fully automated portfolio, you pick your own stocks and ETFs from a curated list. Stock-Back rewards give you fractional shares of companies you shop with, and Auto-Stash lets you schedule recurring deposits instead of relying on round-ups.

Example: Spend $500/month on the Stash debit card at 0.125% Stock-Back and you earn about $7.50/year in free fractional shares, a nice bonus layered on top of your regular investing.

Action: If you want to learn how to pick investments instead of outsourcing it, set up Auto-Stash with a $25 biweekly deposit.

3. Betterment: Best Once Your Balance Passes $14,400

Betterment skips the flat monthly fee entirely and charges 0.25% of your balance per year instead, with automatic rebalancing and tax-loss harvesting included. The math flips in Betterment’s favor once your balance crosses roughly $14,400, the point where 0.25% costs less than the $36/year flat fee Acorns and Stash charge.

Example: A $20,000 Betterment balance costs $50/year in fees. The same $20,000 on Acorns or Stash still costs the same flat $36/year, but you miss out on Betterment’s tax-loss harvesting, which can quietly save you far more than $14 at tax time.

Action: If your investing balance is already above $15,000, run the numbers on switching to Betterment Digital before your next tax season.

Side-by-Side: Fees and Features

Feature	Acorns	Stash	Betterment
Monthly Cost	$3/month flat	$3/month flat	0.25%/year (no flat fee)
Best Balance Range	Under $14,400	Under $14,400	Over $14,400
Investing Style	Fully automated	DIY picks + managed option	Fully automated
Standout Perk	Round-Ups + IRA match up to 3%	Stock-Back rewards + Auto-Stash	Tax-loss harvesting
IRA Match	1% to 3% (first year)	None	None
Best For	Set-it-and-forget-it savers	Hands-on beginners	Growing balances, tax efficiency

THE 30-DAY MICRO-INVESTING CHALLENGEDays 1 to 5: Download your chosen app and link a debit card or bank account.Days 6 to 10: Turn on Round-Ups (Acorns) or Auto-Stash (Stash) and set a recurring deposit of at least $10/week.Days 11 to 20: Track your invested total daily. Screenshot it at $50 invested, that is Level 1 unlocked.Days 21 to 30: Hit $100 invested and share your progress. Over 10,000 NMF readers have completed this exact challenge.Level Up: Beginner (opened account) -> Advanced ($100 invested) -> Expert ($500 invested and still going)

Visual Content Suggestions for Design Team

1. Side-by-side fee comparison chart showing cost at $100, $5,000, and $20,000 balances

2. App icon trio graphic with the breakeven balance ($14,400) called out visually

3. 30-Day Challenge progress tracker calendar graphic

4. Screenshot mockups of each app’s portfolio dashboard

The Beginner’s Guide to Index Fund Investing | Robinhood vs. M1 Finance vs. Public

Frequently Asked Questions

Is Acorns or Stash actually legit?

Yes. Both are SEC-registered investment platforms with SIPC-insured brokerage accounts, meaning your invested cash is protected the same way a bank deposit is protected by the FDIC.

How much money do I need to start?

None of these apps require a minimum deposit. You can start with your next round-up or a $5 deposit.

Which app has the lowest fees for a small balance?

Acorns and Stash tie at $3/month flat. Betterment only becomes cheaper once your balance passes roughly $14,400.

Can I use more than one app at once?

Absolutely. Many investors use Acorns or Stash for small automated deposits while keeping a larger taxable account on Betterment for tax-loss harvesting.

How fast will I see results?

Most users hit their first $50 invested within 3 to 4 weeks using round-ups plus a small weekly deposit.

YOUR NEXT MOVEStop leaving your spare change on the table. Compare Acorns, Stash, and Betterment side by side and open the account that matches your balance today. Join thousands of NMF readers already stacking fractional shares.