Startup cost: $0 - $50

Google Opinion Rewards is a low-cost side hustle. On the low end, you can start with just a smartphone and internet connection, which most people already have, so the cost is effectively $0. On the high end, you might spend up to $50 on a more reliable internet connection or a power bank to ensure you can respond to surveys promptly. There are no hidden fees, and the app itself is free. Most users online agree that it remains low-cost, as there are no additional tools or services required.