Our research includes 212 expert total reviews for 19 best fitness trackers under $400. The highest average score is 87%, while the lowest is 68% (a gap of 19%). There are about 11 reviews per product. Reviews come from sites like PCMag, Wired, and more. Click on a product to see more information (including which reviews were included). This list gets updated every few days as we routinely add the latest products.