Kello2.5 - App Store
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Publisher Description
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.
Version History Recompiled against new SDKs, as required by the store operator's terms for continued sale. Unfortunately, for clients running on older hardware, this means that some OS versions are no longer supported.
We believe that keeping the hardware you already own in good, operative condition, rather than replacing it with new hardware, is best for the environment. Particularly when paired with useful, software-based tools to help service and repair other hardware and tools, like watches, which when well cared for can outlive their original owners. Previous versions of Kello will continue to run and function as they always have on older hardware.
Keep ticking. 2.5 Jul 9 This update addresses a critical bug when running Kello on iOS 14 2.49 09/16/2020 Updated for iPhone X 2.48 11/17/2017 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. 2.47 03/30/2017 Stability improvements. 2.46 03/18/2017 Updated audio engine. Updated imagery in the About view. 2.45 03/16/2017 Interface updates. 2.44 03/02/2017 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. 2.43 10/30/2014 * Improved performance for iPhone 4 devices running iOS 7
* Adds new microphone checks for all devices running iOS 7 2.42 08/07/2014 Addresses a bug that prevented waveform data from being displayed during analysis 2.41 09/18/2013 Updated for compatibility with iOS 7 2.40 09/12/2013 * Faster audio analysis
* Bug fixes for iOS 4.3 2.36 11/26/2012 * Performance improvements & bug fixes for iOS 6 2.35 11/15/2012 * Optimized signal conditioning to improve stability of results for high beat watches 2.32 05/22/2011 * 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 2.3 04/28/2011 * Smoother rate averaging
* Improved performance on iPhone 3G & second generation iPod Touch 2.21 11/09/2010 * Improved noise cancellation 2.13 10/22/2010 * 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 2.11 10/14/2010 1.0 07/11/2010
About Kello
The company that develops Kello is Coldflower Design Corp.. The latest version released by its developer is 2.5.
To install Kello on your iOS device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2026-10-14 and was downloaded 0 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the Kello as malware if the download link is broken.
How to install Kello on your iOS device:
- Click on the Continue To App button on our website. This will redirect you to the App Store.
- Once the Kello is shown in the iTunes listing of your iOS device, you can start its download and installation. Tap on the GET button to the right of the app to start downloading it.
- If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.
- After Kello is downloaded, you'll see an INSTALL button to the right. Tap on it to start the actual installation of the iOS app.
- Once installation is finished you can tap on the OPEN button to start it. Its icon will also be added to your device home screen.
Program Details
System requirements
Download information
Pricing
Version History
version 2.5
posted on 2026-10-14
Version History Recompiled against new SDKs, as required by the store operator's terms for continued sale. Unfortunately, for clients running on older hardware, this means that some OS versions are no longer supported.
We believe that keeping the hardware you already own in good, operative condition, rather than replacing it with new hardware, is best for the environment. Particularly when paired with useful, software-based tools to help service and repair other hardware and tools, like watches, which when well cared for can outlive their original owners. Previous versions of Kello will continue to run and function as they always have on older hardware.
Keep ticking. 2.5 Jul 9 This update addresses a critical bug when running Kello on iOS 14 2.49 09/16/2020 Updated for iPhone X 2.48 11/17/2017 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. 2.47 03/30/2017 Stability improvements. 2.46 03/18/2017 Updated audio engine. Updated imagery in the About view. 2.45 03/16/2017 Interface updates. 2.44 03/02/2017 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. 2.43 10/30/2014 * Improved performance for iPhone 4 devices running iOS 7
* Adds new microphone checks for all devices running iOS 7 2.42 08/07/2014 Addresses a bug that prevented waveform data from being displayed during analysis 2.41 09/18/2013 Updated for compatibility with iOS 7 2.40 09/12/2013 * Faster audio analysis
* Bug fixes for iOS 4.3 2.36 11/26/2012 * Performance improvements & bug fixes for iOS 6 2.35 11/15/2012 * Optimized signal conditioning to improve stability of results for high beat watches 2.32 05/22/2011 * 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 2.3 04/28/2011 * Smoother rate averaging
* Improved performance on iPhone 3G & second generation iPod Touch 2.21 11/09/2010 * Improved noise cancellation 2.13 10/22/2010 * 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 2.11 10/14/2010 1.0 07/11/2010
version 2.49
posted on 2026-06-11
Version History This update addresses a critical bug when running Kello on iOS 14 2.49 09/16/2020 Updated for iPhone X 2.48 11/17/2017 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. 2.47 03/30/2017 Stability improvements. 2.46 03/18/2017 Updated audio engine. Updated imagery in the About view. 2.45 03/16/2017 Interface updates. 2.44 03/02/2017 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. 2.43 10/30/2014 * Improved performance for iPhone 4 devices running iOS 7
* Adds new microphone checks for all devices running iOS 7 2.42 08/07/2014 Addresses a bug that prevented waveform data from being displayed during analysis 2.41 09/18/2013 Updated for compatibility with iOS 7 2.40 09/12/2013 * Faster audio analysis
* Bug fixes for iOS 4.3 2.36 11/26/2012 * Performance improvements & bug fixes for iOS 6 2.35 11/15/2012 * Optimized signal conditioning to improve stability of results for high beat watches 2.32 05/22/2011 * 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 2.3 04/28/2011 * Smoother rate averaging
* Improved performance on iPhone 3G & second generation iPod Touch 2.21 11/09/2010 * Improved noise cancellation 2.13 10/22/2010 * 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 2.11 10/14/2010 1.0 07/11/2010
version 2.49
posted on 2020-09-16
This update addresses a critical bug when running Kello on iOS 14
version 2.49
posted on 2020-09-16
Sep 16, 2020 Version 2.49
This update addresses a critical bug when running Kello on iOS 14
version 2.48
posted on 2017-11-17
Nov 17, 2017 Version 2.48
Updated for iPhone X
version 2.43
posted on 2010-07-11
version 2.49
posted on 1970-01-01
2020年9月16日 Version 2.49
This update addresses a critical bug when running Kello on iOS 14
version 2.48
posted on 1970-01-01
17 de nov. de 2017 Version 2.48
Updated for iPhone X
Disclaimer
Official App Store Link
We do not host Kello on our servers. We did not scan it for viruses, adware, spyware or other type of malware. This app is hosted by Apple and passed their terms and conditions to be listed there. We recommend caution when installing it.
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