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A smart scale won't give you a lab-grade body fat number. What it gives you is a daily data point with zero effort. Over weeks, that turns into a clear trend. That's the job. Buy for sync, app and habit, not for the longest list of metrics on the box.
Withings makes the smart scales we see most in serious home setups. The Body Smart logs weight, body fat, muscle mass and water, and syncs over Wi-Fi so you don't need to open the app each time. The app shows clean weekly trends, which is what you want.
The step up from the Body Smart. It adds more health measures on top of body composition. Worth it if you want the most data from one device. If you just want body fat trends, the Body Smart does the job for less.
Renpho sells more smart scales on Amazon than almost anyone. It reads weight and a long list of body measures, and syncs to your phone over Bluetooth. For the price, it's hard to beat as a daily habit tool.
A good middle option. Wi-Fi sync like Withings, closer to Renpho on price. Solid app with trend views.
If you already train with a Garmin watch, this scale drops your weight and body fat into Garmin Connect next to your workouts. That's the main reason to buy it.
InBody makes the machines you see in gyms and clinics. This home model adds handles, so the current runs through your hands and feet instead of just your feet. That tends to read your upper body better than foot-only scales.
Wi-Fi sync. This matters more than any spec. Bluetooth-only scales make you open the app to sync, and most people stop after a few weeks.
A good app. You want weekly trend lines and export to Apple Health, Google Fit or a spreadsheet.
Multiple users. Most scales know who's standing on them by weight. Check it supports everyone in your house.
Skip the metric count. A scale that shows 15 numbers is guessing 15 times. More numbers doesn't mean more precise.
Want a tighter number to check your scale against? Pair it with a caliper or body tape.