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iOS product

Added August 28, 2026

Hairspring - Watch Timegrapher

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About the product

A serious iPhone timegrapher for mechanical watches. Hairspring measures rate, beat error, and an honest amplitude range from the phone microphone. Measure the same watch twice and it reports whether the readings agree after accounting for each run’s statistical uncertainty. Weak or irregular signals produce a reasoned refusal instead of a plausible-looking number. One $9.99 purchase; no subscription, account, ads, analytics, or automatic uploads.
1 recommendation

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For product owners

Promote Hairspring

Every listing gets one post to our X and Threads followers. It is seen once, then the traffic stops. Promotion keeps Hairspring in front of people instead.

  • Back in the X and Threads rotation. Hairspring gets posted again instead of once.
  • A promoted slot on the AppRater homepage, carrying a Promoted badge.
  • A labelled spot in the weekly email to AppRater subscribers, one promoted app per issue.
  • Stays on the first screen however old the listing is, while new submissions push everything else down.

Quarterly promotion

$35USD every 3 months

Card, Apple Pay and more, through Whop. Starts straight away.

  • Cancel any time from the Whop account you paid with, or email [email protected] and we will do it.
  • The promotion starts straight away, no waiting on us.
  • Whop handles the checkout. We never see your card.

Questions first? Email [email protected].

For ownersOwn Hairspring? Add a deal or post a role, and it shows up right here.

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