Grifin

Grifin is a micro-investing app founded in 2019 that links to your debit or credit card and automatically buys a share (or fractional share) of stock in any publicly traded company where you make a purchase. Spend $4 at Starbucks? Grifin automatically invests $1 in Starbucks stock. The premise is that people invest more confidently in brands they already trust, making the platform a natural entry point for first-time investors who want a hands-off, habit-driven approach to the stock market.

The app is available to U.S. residents only and requires a connected bank account. Grifin operates on a flat subscription model rather than per-trade commissions, which makes its cost structure predictable. However, the platform's investment universe is narrow — it only buys stock in the brands where you shop, offering no exposure to ETFs, bonds, crypto, or international markets. For investors looking to build a diversified portfolio, Grifin is a starter tool, not a complete solution.