The best alternatives to Slim are PlateJoy, CARROT Fit, and TracKit. If these 3 options don't work for you, we've listed a few more alternatives below.
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TracKit lets you keep track of your body weight, workouts, vitamins, water intake, meditation, expenses, etc. Track numbers, habits, goals and time. Set goals and see how you progress towards them on a chart.
Weemple WeightHub is an easy-to-use desktop app, to synchronize your body weight data between platforms, with clouds or files. Fitbit, Garmin, Withings, Apple, Beurer, Google, Under Armour and more.