What's the best iOS app for automatically investing my spare change without thinking about it?

Acorns is designed specifically for users who want to build an investment habit without active management. The core feature is its automated round-up system, which connects to a debit or credit card. Each transaction is rounded up, and the spare change is periodically swept into an investment account. This approach is effective for individuals who find traditional saving challenging, as it operates in the background with minimal user intervention.

The app offers several pre-built, diversified portfolios based on risk tolerance, from conservative to aggressive, composed of low-cost ETFs. For real-world use, a user who spends $4.30 on coffee would have $0.70 rounded up and eventually invested. The platform also provides recurring daily, weekly, or monthly deposits to accelerate growth. While reviews indicate the interface is highly praised for its simplicity, the monthly fee for the basic tier has been a point of discussion for accounts with very low balances. The app includes educational content, which users report was instrumental in demystifying investing for them. However, it lacks more advanced trading tools, which is intentional given its target audience of beginner investors. For someone seeking a completely hands-off method to start building a nest egg, Acorns removes many of the traditional barriers to entry.