Well, Withings has all kinds of products but I wouldn't say they are a major player in any of them, in each product category there are players that are bigger and/or better: Fitness trackers:

- Apple Watch

- Fitbit.com

- https://explore.garmin.com/en-US/vivo-fitness/

- https://misfit.com/

Scales:

- fitbit.com

- https://www.getqardio.com/qardiobase-smart-scale-iphone-andr...

- https://www.underarmour.com/en-us/healthbox

Home cameras they come behind:

- nest.com

- canary.is

- https://www.netatmo.com/product/security/welcome

Blood pressure cuff:

- https://www.getqardio.com/qardioarm-blood-pressure-monitor-i...

Sleep monitor:

- http://www.beddit.com/

- https://hello.is/

- http://www.resmed.com/us/en/consumer/s-plus.html

Thermometer:

- https://www.kinsahealth.com/