Colmi
R02
Based on 60 Reddit mentions
$55.98
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Most discussed features
Sentiment summary across the product areas Reddit users mention most.
Reddit mentions
Original Reddit posts and comments behind this analysis.
I bought the cheapest smart ring on AliExpress… and ended up reverse engineering the TK5
Cool, i have done something similar for Colmi R02 ring which i bought very cheap. https://github.com/aimindseye/colmi-r02-firmwareThere are many other who have done similar work on Colmi R02 ring.
mindseye73 in r/SmartRings
July 30, 2026 1:50 AM
3
Reverse engineered s $7 Chinese smart ring from Temu, and built my own iOS app for it
It won't actually be $1, when you actually go to pay it will definitely be $7+. As I mentioned, in my personal use for last three weeks I found steps and HR to be decent compared to Apple Watch and Fitbit Air. I am also adding support for Colmi rings which are $20+ and known to be slightly better. T
...alphacentarii in r/hardwarehacking
June 13, 2026 2:11 AM
3
Suggestions for a starter Smart Ring please!
I am using the Colmi R02 as my starter ring and it has taught me a lot. It was really inexpensive to get. At first it was my gateway ring until I got my Pebble Index 01. Instead it has become a learning tool to see what it can show me over even my smartwatch. So i do recommend it as a cheap way to g
...fodder650 in r/SmartRings
January 22, 2026 12:22 PM
4
Smart ring options besides Ringconn and Ultrahuman?
I have a cheap Colmi Ring, heart rate, steps and sleeping is quite accurate, battery last 5 days and has been quite reliable, super happy for now. Cost around 25usd
kukayari in r/SmartRings
September 2, 2025 2:03 PM
4
Inexpensive smart ring that syncs to Apple Health?
Thanks! Was just on Amazon and saw the COLMI R02 and seemed legit. Qring app seems to write to Apple health easily enough.
casting_cubs_away in r/SmartRings
September 3, 2025 11:56 PM
4
Roast my iOS app that I built for a $7 generic Chinese smart ring from Temu
I got it from AliExpress (see in the link in my writeup). But I have been trying the Colmi rings recently and they are better. I am adding support for them very soon.
alphacentarii in r/iosdev
June 17, 2026 6:53 AM
2
Best Budget Ring
I recently discovered the Colmi rings. I went with R09. I haven’t tried more expensive brands or those with newer tech. But mine seems fairly accurate for sleep. I’m happy and see no reason to upgrade for now. But if I do, it’s likely to be a Ringconn.
wanderer117 in r/SmartRings
February 24, 2026 11:03 PM
2
Best Budget Ring
I went back to my Colmi R02.at this point I'd like to see if Colmi makes a new generation. Id move to Ceramic.
fodder650 in r/SmartRings
February 24, 2026 11:45 PM
2
Smart watch Health data alternatives?
I've been using it for a while with my Garmin watch and a Colmi ring. Working great, cannot ask anything else. I just have some connection issues from time to time with my watch, but I blame Garmin for that one.
ArnyminerZ in r/degoogle
September 29, 2025 8:04 AM
3
Colmi R09 ring
I use the R09 because it's the nicest of the Colmi rings (I like the nubs for the sensors for locating ring position) and temperature sensor. Colmi rings are the only smart rings that work with Gadgetbridge, so if you are active at all in the privacy and open source community, they're really the onl
...bionicdna in r/SmartRings
February 4, 2025 12:37 AM
4