I've been looking for a solution for this as well. I lost my Fitbit One a month and a half ago...
The interim solution I have is to use your mobile phone and Fitbit's MobileTrack. You'll have to check the Fitbit site for phone compatibility, but my iPhone 6S+ works fine. In the Fitbit app, add a device and choose MobileTrack.
I've been researching a replacement tracker and I think I will go with the Vivoactive HR. I am seeing users post issues that I feel can be addressed via a firmware update, but we'll see. I have no idea how responsive Garmin is to their equipment issues.
That being said, I will probably continue to track my steps with my phone in order to compete with friends that are in the Fitbit ecosystem.
This is an old post, but if you're still searching....
I found this and it works pretty well. Your steps won't be real time, but get uploaded the next morning for the previous day...works well enough for me to be "friends" with my wife and daughter on Fitbit, even though I use a Garmin watch for my steps and activities.
thanks for the link...trying it out now and it seems to work as advertised
When compared to the Fitbit app, Garmin Connect is unfortunately a POS. If there was a way to utilize the Fitbit App instead, I'm sure many of us would swap over in a heartbeat. Fitbit is unlikely to ever enable Garmin watches to play games. They'd probably sell fewer Fitbits if they did. So, at the end of the day, which one you choose will be determined by how you intend to use the watch. Fitbit provides sleep data, steps, integration with nearly every other app, and a pretty easy experience with excellent support. Great hardware, fits with chest straps, is waterproof, has GPS tracking built-in, and sophisticated run stats, however, Garmin's software and service are terrible.
I have become increasingly disappointed with Fitbit's support for hikers. In the old days my Charge 2 would give me a GPS map (data from my phone), heart rate, pace, steps and calories (the latter I don't care about) but not for a long hike. Some time back it quit mapping, now the Charge 4 will map--but only 5 hours and cutting off the heart rate etc data even sooner than that.
This is making me more and more consider the Garmin world but I'd certainly like to copy over the heart rate, pace & steps. Does that app cover those things?