Kello

Kello


Mechanical Watch Analyzer


$9.99

2.49for iPhone, iPod touch
5.5
5 Ratings
Coldflower Design Corp.
Developer
1.2 MB
Size
Sep 16, 2020
Update Date
Utilities
Category
4+
Age Rating
Age Rating
4+
Apps in this category do not contain restricted content.
9+
Apps in this category may contain mild or occasional cartoon, fantasy or real-life violence, as well as occasional or mild adult, sexually suggestive or horrifying content and may not be suitable for children under 9 years of age.
12+
Apps in this category may contain occasional mild indecent language, frequent or intense cartoon or real-life violence, minor or occasional adult or sexually suggestive material, and simulated gambling, and may be for children under 12 years of age.
17+
You must be at least 17 years old to access this App.
Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.
Kello Screenshots
Kello posterKello posterKello posterKello poster

About Kello

Kello analyzes the precision of mechanical watches against the iOS system clock using a microphone.


How Kello works:

All mechanically regulated watches are designed to start and stop 1000s of times every hour. A portion of the energy used during this starting and stopping motion is released as acoustic energy, resulting in an audible "tick-tock" sound. The regularity of this sound can be measured against the more precise, internal time-signal of iOS devices, such as the iPhone, and the resulting difference in timekeeping is displayed by Kello.


Supported Watch Frequencies:

Kello can automatically determine the frequency of the watch being measured based on eight of the most common frequencies used in mechanical watches. These frequencies are standard among low-, middle- and high-grade mechanical timepieces and will accommodate the vast majority of mechanical watches produced in the past 100 years. The following frequencies are supported:

* 14,400 bph
* 16,200 bph
* 18,000 bph
* 19,800 bph
* 21,600 bph
* 25,200 bph
* 28,800 bph
* 36,000 bph


Recommended hardware:

Kello works best with an external microphone that has an excellent frequency response between 10,000 and 20,000 Hz.


How to know if your watch is mechanically regulated:

There are four simple ways to determine if your watch is mechanical and can be used with Kello.

1. Look at the text on your timepiece. If the word "quartz" is featured anywhere on the watch, your watch is not mechanical. If the words "automatic" or "shock-proof" are written anywhere on the watch, there is a very high chance that your watch is mechanical and its precision can be measured by Kello.

2. If your watch has a hand that indicates the seconds, observe how frequently it moves. If the hand moves only once every second, it is very likely that your watch is not mechanical. If this hand moves several times per second or appears to sweep along in a smooth, continuous motion, your watch is most likely mechanical and its precision can be measured by Kello.

3. Turn the crown, that is used to set the hands of the watch, while it is pressed fully in. If the crown turns smoothly, your watch is not mechanical. If you can hear a ratcheting sound as you turn the crown, your watch is most likely mechanical and its precision can be measured by Kello.

4. Place the watch close to your ear and listen. If you hear a noise approximately once every second, it is unlikely that your watch is mechanical. If you hear a constant ticking noise, your watch is very likely a mechanical watch and its precision can be measured by Kello.
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What's New in the Latest Version 2.49

Last updated on Sep 16, 2020
Old Versions
This update addresses a critical bug when running Kello on iOS 14
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Version History
2.49
Sep 16, 2020
This update addresses a critical bug when running Kello on iOS 14
2.48
Nov 17, 2017
Updated for iPhone X
2.47
Mar 30, 2017
This version brings an increase to the measuring duration over which the readings are averaged. For watches in good health, you should notice smoother variations as the rate settles.
2.46
Mar 18, 2017
Stability improvements.
2.45
Mar 16, 2017
Updated audio engine. Updated imagery in the About view.
2.44
Mar 2, 2017
Interface updates.
2.43
Oct 30, 2014
This update increases the sensitivity of the signal amplification to better accommodate watches with plastic escapements, like those found in the Swatch Sistem51, Tissot Powermatic, and Hamilton Pan Europ Auto. Optimal placement of the microphone near the escapement is still critical to achieving a clean signal on these watches. Please feel welcome to get in touch, with the make and model of your watch, at kello@coldflower.com, for guidance on how best to position the microphone.

The rate averaging period has also been increased in this update to provide more stable results. If you use Kello to make changes to the rate of timekeeping of a timepiece, pause and restart analysis between adjustments to ensure the accuracy of results.
2.42
Aug 7, 2014
* Improved performance for iPhone 4 devices running iOS 7
* Adds new microphone checks for all devices running iOS 7
2.41
Sep 18, 2013
Addresses a bug that prevented waveform data from being displayed during analysis
2.40
Sep 12, 2013
Updated for compatibility with iOS 7
2.36
Nov 26, 2012
* Faster audio analysis
* Bug fixes for iOS 4.3
2.35
Nov 15, 2012
* Performance improvements & bug fixes for iOS 6
2.32
May 22, 2011
* Optimized signal conditioning to improve stability of results for high beat watches
2.3
Apr 28, 2011
* Improved precision
* Expanded audio spectrum analysis to accommodate a broader range of timepieces and microphones
* Added a progress bar for initial data grab
* Added indicator to visualize measurement duration
* Added new bph frequency

2.21
Nov 9, 2010
* Smoother rate averaging
* Improved performance on iPhone 3G & second generation iPod Touch
2.13
Oct 22, 2010
* Improved noise cancellation
2.11
Oct 14, 2010
* Improved signal detection & analysis
* Added a slider to adjust signal amplification
* You can now manually input or automatically detect frequency
* Analysis of watches with a frequency of 14,400 bph is now supported
1.0
Jul 11, 2010

Kello FAQ

Click here to learn how to download Kello in restricted country or region.
Check the following list to see the minimum requirements of Kello.
iPhone
Requires iOS 12.0 or later.
iPod touch
Requires iOS 12.0 or later.
Kello supports English

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