By Jinfei Sun

  • Category: Utilities
  • Release Date: 2015-03-30
  • Current Version: 2.0.0
  • Adult Rating: 4+
  • File Size: 7.33 MB
  • Developer: Jinfei Sun
  • Compatibility: Requires iOS 8.0 or later.
  • App Ratings:
    3/5 ( 56 App Reviews)
  • Price:
Hairspring App Ratings: 3
Based on 56 App Reviews

Hairspring App Details

Hairspring turns your device into a powerful mechanical watch timing machine. It measures the precision of mechanical watches, with an accuracy of at lease ±1s/day, by analyzing the tick-tock sound using the microphone of the device. It supports a wide range of frequencies, covering almost all mechanical watches available on the market: - 14,400 VPH - 16,200 VPH - 18,000 VPH - 19,800 VPH - 21,600 VPH - 23,400 VPH - 25,200 VPH - 28,800 VPH - 36,000 VPH In case you don't know your watch's frequency, you may use frequency auto detect. The measuring time can be set from 30 seconds to 3 minutes, to get a balance between response time and accuracy. An oscilloscope shows the audio waveform in real time. It's quite handy for monitoring the status and diagnosing some common problems. The result is plotted in a chart, which can be saved for later reference. Also, it can record and save a long-time measurement, e.g. for 12 hours, to analyze the long-time performance of the watch. To use Hairspring, just place the microphone tightly close to the watch back, then set the parameters. After collecting enough data, the result will be shown. A detailed usage guide can be found here:


Hairspring App Screenshots

App Reviews

  • Doesn’t work for me

    By gblax
    Can’t get it to work. Don’t bother. I agree with some others that the issue seems to be it never asks for permission to use the microphone and has no ability to set the sound levels.
  • Does not work!

    By ck2998
    This thing does not work at all
  • Doesn’t work

    By mstuehler
    I just installed this app, and it doesn’t work at all. It needs access to the camera and microphone, but it doesn’t ask for either, so you can’t grant access. Without access, it can’t do anything. Apple should stop selling this app immediately.
  • Did not work in my case

    By rmecon
    I installed the Hairspring v. 2.0.0 on iPhone 7Plus running on iOS 12.1. It doesn’t to pick up any signals whatsoever. I have an impression the app doesn’t connect to the microphone. I tried to access the app’s settings from within the app but there is very little control over the app’s settings (other than measuring time and frequency).The app doesn’t even show up anywhere in iPhone->Settings or iPhone->Settings-> Privacy. Send an email to the developer and heard nothing back. Subsequently downloaded one of the comptering apps and it worked beautifully. In short, don't waste your money.
  • Junk

    By Sensitivity Master
    Just downloaded this app and I cannot get any reading to make a measurement. When I tried to add my phone info I tapped on picture and the camera screen was blank. I checked in settings to make sure app has access to camera and microphone but this app doesn’t even show up. Sorry I wasted $5.
  • Maybe for pocket watch, doesn’t work with wristwatch

    By darrenb123
    Bought this app to time a Rolex sea-dweller. Will not detect ticks. Using an iPhone X Tried the headphones and the phone mic, neither worked.
  • Waste of money

    By Max Rautha
    Very inaccurate readings , this app doesn't help you in proper watch regulation
  • Did not work well

    By Kevin @Everyday-MBA
    I’ve tried this app twice. Not much luck. Using both the internal mic of my iPhone and the headphone mic just get “no signal detected” on all but one of my watches.
  • A Fickle Beast

    By BobbyRJ
    I wanted to love the app, and indeed I did love it when first using it. The interface is easy to use, and the mic auto-adjusts as needed to pick up watch ticks just by laying the watch on the iPhone mic, displaying the beats in realtime. Unfortunately, the computation mechanism is prone to occasionally go rogue. I've seen the app go from displaying the accurate rate (for this example, -7 sec/day) to inexplicably suddenly jumping up to +120 sec/day for a minute or so, and then drifting quickly back down to the original measurement rate when there is no change in background noise (as evidenced by the realtime display.) The upshot is the app is workable if you can measure several trusted consistent sessions to weed out the wild measurement fluxuations.
  • Doesn’t work

    By UnikInk
    I tried 3 mics including the built in microphone, 4 different watches, and it only was able to work with one of my watches, and it was extremely finicky making that one work.