Fitbit is a line of wearable fitness devices owned by Google. Wearers of Fitbit products, including the Surge, Charge, and Versa, report the calorie counter function is inconsistent in reporting calories burned. Owners also state that Fitbit shows calories burned when idle. One owner reported nearly the same calories burned when they took 13,000 steps versus the next day 8,000 steps. 

A 2017 research study by Stanford found that Fitbit Surge was off by 27%. Another 2019 study by Aberystwyth University found the Fitbit Charge 2 was off by over 53%. 

There is likely a case against Google for inaccurate advertising and/or defective products since the step-counter does not accurately report users’ steps. In January 2021 two related class-action lawsuits were filed against Fitbit for inaccurate heart rate monitoring, fraud, and violations of U.S. securities law.

Additionally, in 2019, Fibit settled a class action regarding the inaccurate sleep tracking function in its watches for $20M in damages and $7M in attorneys’ fees.