# Hairspring: Watch Timegrapher — Rate, Beat Error & Amplitude

> iPhone timegrapher for mechanical watches, measuring rate, beat error, and amplitude. (iPhone/iPad app by Marat Oganesyan.)

- Source: https://appshunter.io/ios/app/hairspring-watch-timegrapher/id6797146448 (this page in markdown: same URL + `.md`)
- Developer: [Marat Oganesyan](https://appshunter.io/developer/6797146450)
- Category: Utilities, Lifestyle
- Price: $9.99
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 18.0 · 2 MB
- Languages: American English
- Released: 2026-08-18
- Data updated: 2026-10-07
- Monetization: paid

## What is Hairspring?

Hairspring is a serious iPhone timegrapher for mechanical watches. It measures rate, beat error, and amplitude — and tells you when the signal cannot support a trustworthy answer.

MEASURE TWICE, SEE IF THEY AGREE
A single number is not proof. Measure the same watch again and Hairspring compares the two runs, includes the statistical uncertainty of each rate, and states whether the readings
agree. Save the verification in History and its PDF report.

WHAT IT REPORTS
• Rate in seconds per day, with statistical fit uncertainty
• Automatic detection of common beat rates from 14,400 to 36,000 bph
• Beat error from the escapement's high-frequency signature
• Live amplitude as a range, reflecting what an acoustic measurement supports
• Live timing graph and six-position measurements
• Local history, drift and session comparisons
• PDF measurement receipts for sharing with a watchmaker

BUILT TO WITHHOLD BAD DATA
Too much scatter, an implausible result, or timing too disturbed to number the beats produces a clear explanation and a suggested fix — not a plausible-looking number. The
analysis band was chosen by a pre-registered experiment whose acceptance criteria were written before the data was collected; the first failed attempt remains documented.

ONE PURCHASE, NO SUBSCRIPTION
Everything is included with your purchase: every measurement, position run, history entry, comparison, PDF report, and optional raw capture. No subscription, no in-app purchase,
no account, no sign-in, no ads, and no analytics.

PRIVATE BY DESIGN
Live audio is analyzed on your iPhone and is never uploaded automatically. Raw capture is off by default; if you enable it for diagnostics, the file stays on your device unless
you explicitly export it.

SETUP MATTERS
Place the watch beside the phone — never on it — on a hard surface near the bottom microphone. Hairspring includes a visual setup guide and live signal-path coaching so you can see what needs attention.

Requires a mechanical, not quartz, watch. Rate is what a phone microphone measures best; amplitude and beat error are reported with their limits stated.

## Key features

- Measures rate, beat error, and amplitude
- Compares multiple measurements for accuracy
- Generates PDF measurement reports
- Automatic detection of common beat rates
- Live timing graph and six-position measurements
- Privacy-focused with on-device analysis
- Visual setup guide and signal-path coaching

## Is Hairspring safe?

Not enough ratings yet to assess Hairspring.

## Is Hairspring legit?

Hairspring: Watch Timegrapher has limited verification signals. The AppsHunter Legitimacy Score for Hairspring is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Frequently asked questions about Hairspring

### What is Hairspring's price?

Hairspring is available for a one-time purchase of $9.99. This purchase includes all features, with no subscriptions or in-app purchases required.

### Does Hairspring have ads?

No, Hairspring is completely ad-free. The app is designed to provide an uninterrupted user experience without any advertisements.

### What devices does Hairspring support?

Hairspring is currently supported on iPhone devices. It requires a mechanical, not quartz, watch for analysis.

### How often is Hairspring updated?

The latest version, 1.0.2, was released on August 27, 2026. The app was initially released on August 18, 2026, indicating recent development activity.

### Is Hairspring suitable for beginners?

Hairspring includes a visual setup guide and live signal-path coaching to help users achieve accurate readings. While it offers advanced analysis, these tools aim to assist users in proper setup and usage.

### Can Hairspring analyze quartz watches?

No, Hairspring is specifically designed for mechanical watches. It measures characteristics unique to the escapement of mechanical timepieces and cannot be used for quartz watches.

### What kind of reports does Hairspring generate?

Hairspring generates PDF measurement receipts that can be shared with watchmakers. These reports include rate, beat error, amplitude, and statistical uncertainty of each reading.

### How does Hairspring handle bad data?

Hairspring is built to withhold bad data. If there is too much scatter, an implausible result, or timing too disturbed, it provides a clear explanation and suggested fix rather than a misleading number.

## Version history (last 3 releases)

### 1.0.2 — 2026-08-27

Measure twice—and keep the evidence. A completed rate verification now stays with the saved measurement in History and in its PDF report, including both readings, their fit uncertainty, the agreement limit, verdict, and analysis version. Amplitude ranges are now consistent throughout the app, position summaries describe observations without over-diagnosing the movement, and Settings reports the installed app version accurately.

### 1.0.1 — 2026-08-24

- Rating prompt: once ever, after the third saved measurement.
- PDF report footer: names Hairspring, tappable App Store link.

### 1.0 — 2026-08-18

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-07.*