3/5 rating based on 50 reviews. Read all reviews for Kello for iPhone.
Kello is paid iOS app published by Coldflower Design Corp.
Forum seeker
In a nutshell, it doesn't work. Most of the time the mic isn't sensitive enough to pick up a stable sound signal. When it does (loud watch and very quiet environment), the measured rate is all over the map. My watches are generally within a couple of seconds of correct time, but you'd never guess that from looking at the readings from Kello, which suggest that they're varying by +- 20 seconds. Needless to say the results don't match the output from a timeographer.
tmarshl
1. I needed to use the microphone with the earPods which came with the iPhone. 2. The placement of the microphone on the case back is CRITICAL. You need to move it around until you get a strong signal. 3. Start with the highest amplification until you find a strong signal, then taper off. Once I found the "sweet spot" on the case back of the watch, Kello worked flawlessly. I compared its reading to a 24 hour timed test using an atomic clock signal, and it was spot on.
Knifemaker1
The reviews above are pretty accurate as far as getting a signal goes. But, when you manage to get a good signal, it works well. I ended up taking the case back off my watch and laying the open case on the iPhone microphone - stem down, 45 degree back tilt. Be sure to adjust the volume as stated in the instructions. After a little tinkering, I now have two Chinese automatics running within 2 seconds per day. That is in actual use, not just what Kello says. I only give it four stars due to the microphone hassles. I would buy it again.
CAG_1337
Tried this with multiple mechanical watches and in several differenet mic placement variations...not once did it register a signal. I've never wanted a refund on a app more than I do with this one.
Eigthoclock
Read some reviews on the Internet that didn't sound too hopeful but when I got it I just followed the directions and everything worked fine .It worked on all the watches I wanted to check . I had a idea of my watches accurate because of my atomic watch ,which checked out. Maybe people don't know how to follow directions? I will tell my friends about this app and I am very happy with it!
Rich.V1963
Don't waste your time money or effort . Did exactly what it said could not get a reading . Waste of money and at 8.99 real JUNK.
Driver1969
Not the easiest app to use. The results tend to bounce around a bit, but I was able to regulate a 6497 clone to within +/- 10 sec from over +95 sec over 24 hours. Considering the alternatives out there: no other app or $$$ on a timegrapher or watch repair person, I'll say it's money well spent.
Alex Baroiant
Tried another app to save a couple of bucks, looks like I wasted my $ on that one. Kello worked fantastic first time out. Two thumbs up.
RodWolf30
I'm a watchmaker. This app offers me no help what so ever. It somewhat works on pocket watch. But not for wristwatch
Barihunk
This app would be a real gem, IF it worked. Even if you get a strong signal, the readings are never stable. Save yourself the hassle and time the watch yourself.