Suggestions for a Bluetooth chest strap other than a Wahoo tickr? Does the Garmin duo strap work on iOS ? Thanks in advance.
I just use the el cheepo coospo BT/ant+ hr strap. Bluetooth is Bluetooth to me…regardless of OS.
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I have the Garmin DUO and it works great in iOS. I have it simultaneously connected to my garmin and to my ipad for TR.
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I use the Bontrager one for years now, no issues. I think I’ve changed the battery once
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+1 for the CooSpo. Picked it up on Amazon for $30ish. Flawless, works every time., BT/ANT+. Tickr has given me nothing but problems.
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I use the 4iiii HR strap which I also use as a bridge for the ANT+ signal from my power meter (4iiii) into a single BT stream to Apple TV to run Zwift. No problems 1+ years.
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I couldn’t get hold of the Tickr that everyone recommended so I ended up with the CooSpo Ant +/Bluetooth. Its worked fine the few times I’ve used it on Bluetooth (Strava pre their scrapping of BT sensors) but I have TR set up to connect to the Ant. For the last 8 months its worked fine so I’ll leave it that way (ant +) 
I like the beep and flashing LED when it connects so you know the unit is fine 
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And another +1 for the coospo. The unit is a bit big, so I still use my Garmin strap outside, but have had no issues inside simultaneously broadcast to zwift on appleTV, and TR on my phone.
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Appreciate all the replies - thanks all.
I have a Polar H10, it has been the most consistent HR monitor I have had, it also supports simultaneous dual BT and ANT+ connections.
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+1 for Polar. I am using the H9, which is slightly cheaper and has less features than H10 but still an excellent model for Bluetooth smart and ant+.
I use it for hrv measurements with my android smartphone, and obviously when riding too.