I'm looking for a fitness device, and while I think the devices that collect a lot of data are really cool, I'm concerned about that data being stored in an online account. I have little faith in privacy and security protection I have so little control over, and I can't seem to find a device that doesn't require signing up for a "free account" to actually track the data collected.
Are there any applications out there for MacOS or iOS that can synchronize with a wearable device and store the data locally either by syncing directly with the computer or with a self hosted server? It may be that none of the devices are able to store data without a Bluetooth connection to another device, so an app that doesn't upload the data from the phone to a third party would be an acceptable solution also.
I'd like the device to be at a minimum a pedometer and heart rate monitor. It would be a big bonus if it tracked sleep patterns. I could create my own software to manually track the data, so what is important to me is downloading the data that was collected in real time from the device in a format that I can manipulate it without a third party storing that data.
We've switched all of our computers, tablets and phones over to Apple products, so I'm updating the question. I am doubtful that what I want exists, but I'll leave this question open just in case something comes on the market.