Chronograde: Watch Accuracy
Timegrapher, Rate & Drift
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Listen to your watch with free microphone checks. Keep your collection together; Pro adds position analysis, wear logs and service history.
Know your watches beyond a single reading. Chronograde brings together microphone-based estimates, manual drift records and your collection history.
FREE TO START
Keep an unlimited watch collection with photos and details. Use the Timegrapher for acoustic rate and beat-error estimates, save up to 10 manual readings, and complete one guided Regulation Coach run. iCloud sync and JSON backup remain free.
UNDERSTAND THE READINGS
Acoustic results depend on the watch, microphone placement and background noise. Manual readings compare displayed watch time with a network reference or the labeled device-clock fallback; timing and reference errors affect the result. Estimates do not replace professional testing.
COMPARE SESSIONS (Chronograde Pro)
Compare two manual sessions by observed daily rate, reading count, elapsed coverage and recorded positions. Preview and share a comparison PDF. A difference does not prove a service effect.
WEAR & SERVICE (Chronograde Pro)
See distinct logged days per watch over 30, 90 or 365 days. Days without entries mean not logged. Keep wear and service records with provider, cost and notes.
PRIVATE REPORTS (Chronograde Pro)
Choose watches, history and a date range, then preview and share a PDF. Serial numbers, notes, amounts and photos are excluded by default. A report is not a backup, appraisal or certification.
MORE HISTORY (Chronograde Pro)
Record unlimited manual readings and sessions, explore rates by position and repeat guided Regulation Coach runs.
REFERENCE & EXPORT (Chronograde Pro)
Use a large reference clock with available network time correction. Import watches from CSV and export records to CSV or Excel.
MEMBERSHIP
Choose monthly, annual or one-time Lifetime access. The free tier may display advertising with your consent; active Pro access removes ads. Optional paid themes are separate purchases.
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Subscription details: Chronograde Pro offers monthly or annual subscriptions. Eligible customers can start with a 14-day free trial. Renews automatically until cancelled in Settings > Apple ID > Subscriptions at least 24 hours before the next billing date. Payment is charged to your Apple ID.
Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy: https://mwsupplylimited.github.io/chronograde/privacy.html
more Redesigned Pro watch reports and session comparison PDFs with clearer summaries, session charts and organized histories. Your saved records and report privacy choices remain unchanged.
1.9.1 6d ago
New with Chronograde Pro:
• Compare two manual sessions and preview a comparison PDF.
• Explore logged wear over 30, 90 or 365 days.
• Create watch reports with private fields excluded by default.
Also: clearer purchase terms and restore feedback, and more reliable wear/service saving.
Your existing free features and Pro access are unchanged.
1.9.0 Sep 20
The Timegrapher can finally measure beat error.
It was rounding every reading to the nearest 2.7 ms, so almost every watch read 0.0 ms. The number was always there — the app just couldn't see it. Resolution is now about 0.03 ms.
• Rate was wrong beyond roughly ±54 s/day, sign included. Fixed, and it now settles about four times faster.
• Regulation Coach: in several translations the fast/slow advice was reversed, so a watch running slow was told it ran fast. Fixed.
• Every watch now shows when it was last measured — in the list and on its own screen.
• Fully translated into 20 languages, widget included.
• Laid out properly for iPad.
• Fixed: a backup could be written empty, and two kinds of reminder never arrived.
1.8.0 Sep 10
The free trial is now 14 days, up from 7.
A drift tracker can't prove itself in a week — the chart needs readings days apart. Two weeks is enough to actually see how your watch behaves before you decide.
• Chronograde Pro's Lifetime unlock is now $29.99.
• Fixed: the Timegrapher's rate row showed its label and unit in English on non-English devices.
1.7.1 Aug 22
Chronograde now speaks 20 languages.
• The whole app is translated — Timegrapher, drift charts, position analysis, service and wear logs, and every alert.
• Numbers, dates and times now follow your region, so a rate reads 3,2 s/day where that is the local convention. Exported CSV files stay in the format spreadsheets expect.
• You can rate Chronograde or share it straight from Settings.
• Fixed: the sync status glyph no longer redraws the whole watch list on every iCloud event, and the background clock is suspended while the app is not on screen.
1.7.0 Aug 20
• Fixed: if your iCloud uploads had already stopped working before you updated, the sync screen still showed a green tick. It now says plainly when it can't confirm your uploads, and shows the date of the last one that actually left this device. This is the fix 1.6.3 was meant to be — thank you to the owner who kept checking.
• The iCloud screen is no longer behind Chronograde Pro. Syncing is free for everyone, so knowing whether it is working should be free too.
• "Sync Now" no longer reports that you're up to date while a sync error is showing directly above it, and VoiceOver now reads out the sync state instead of just "iCloud Sync".
• Fixed: the average rate in exported CSV and Excel files was calculated straight through a session reset, so it could disagree with the app — sometimes by a lot. Both exports now match what you see on screen, and the per-watch CSV has gained a session column.
• Fixed: exports numbered sessions differently from the app once you had deleted one, and the watch page could show two different numbers for the same session.
• Fixed: the Home Screen widget could keep showing a renamed watch's old name, or the rate from a session you had just deleted.
• Regulation Coach no longer reports "Excellent — tightly regulated" when it never managed to hear your watch, and no longer spends your free run when that happens. If microphone access is off it now says so and offers to open Settings.
• Fixed: recording a measurement while atomic time couldn't refresh warned you it was using the phone's clock. It wasn't — your last known atomic offset was still being applied — and those readings are no longer marked unsynced.
• Chronograde Pro subscribers are no longer briefly shown ads while the app checks their subscription at launch.
• Importing a CSV that matches a watch in Recently Deleted now restores that watch and tells you, instead of merging into a hidden one.
• Deleting a wear entry now updates "last worn" properly instead of leaving the old date behind.
1.6.4 Aug 17
• The iCloud screen now tells you the truth. If something on this device hasn't reached iCloud, you'll see it said plainly instead of a green tick — along with the date of the last successful upload, rather than the last time anything synced at all. A watch owner spotted that those two can be very different things, and he was right.
• Fixed: a watch with a photo attached could never upload to iCloud. If you've added photos, those watches should start syncing again.
• A sync warning no longer vanishes when you reopen the app, so a problem that needs your attention stays put until it's genuinely resolved.
• "Sync Now" now tells you what it actually did, instead of spinning for a moment and leaving you to guess.
• The record count on the iCloud screen is now labelled "Records on this device", because that is what it has always counted.
1.6.3 Aug 11
• Sessions now have a home of their own. The watch page shows your three most recent, and "All Sessions" opens the full list — sort by date, number of readings or length, select several at once, and delete the ones you don't need.
• Deleted a session by mistake? It moves to Recently Deleted with its measurements intact, until you recover it or erase it for good. A stray swipe no longer costs you a run of readings.
• Fixed: after you start a new measurement session, the average rate on the Watches list now matches the one on the watch's detail screen. A rate is never averaged across a reset — the readings either side of one aren't comparable, so the figure spanning it was meaningless. Thank you to the owner who reported this with screenshots.
• The same fix applies to the Home and Lock Screen widgets and to Siri, which could both quote that stale figure.
• Every keyboard now has a Done button, and tapping outside a field closes it. The number pads for price, cost and offset previously had no way out at all.
• The rating prompt now waits for a genuinely good moment. It won't ask right after a reading shows your watch drifting badly, right after a full-screen ad, or right after you've hit the free measurement limit.
• Crowns have been retired. What Chronograde Pro unlocks is now simply what Pro unlocks, with no second currency to reason about.
1.6.2 Aug 4
• Chronograde Pro now removes every ad. The free tier is ad-supported again, which is what keeps the Timegrapher free for everyone.
• Ads are kept out of your way by design: they never cover the controls, and never interrupt a measurement or a Timegrapher session.
• New: every watch owner gets one complete Regulation Coach run, free. Walk the six positions, see which one is dragging your rate down, and get a plain-language regulation suggestion — no subscription needed to try it.
• Earn Crowns by watching an optional video again — alongside the daily bonus, which stays. Crown-funded measurements are now limited to two a day, so the free allowance stays a genuine safety net rather than a second subscription.
• New: long-press any watch on the Watches tab for quick actions — mark it worn today, record a measurement, measure on the Timegrapher, share its accuracy card, edit, and more.
• Membership now shows exactly how the free trial works — what unlocks today, and precisely when (if ever) you're charged.
• Clearer Pro feature list, and tapping a locked feature now tells you what that specific feature does.
• Recording a measurement no longer taps out each second. Haptic seconds now live only on the Clock, where the beat can't be confused with the watch you're reading.
1.6.0 Jul 30
• New: Home & Lock Screen widgets — see your headline watch's daily rate and offset at a glance. Add one from the Home Screen or the Lock Screen.
• New: choose your app icon in Settings › App Icon — Automatic follows the system (light in Light Mode, dark in Dark Mode, even when Chronograde isn't open, on iOS 18 and later), or pin the Light or Dark icon.
• Improved: steadier accurate time — if a background refresh can't reach a time server, Chronograde keeps your last good atomic-time offset instead of falling back to the device clock.
• Tidier: the "Haptic seconds" switch now lives in one place, Settings › Clock.
1.5.0 Jul 17
• New: Haptic seconds — feel a gentle tap each second and a firmer pulse every five, on the Clock and while recording a measurement, so you can tap on the exact second. Turn it on from the Clock, the Record screen, or Settings.
• Fixed: the Automatic app icon now reliably follows Light/Dark Mode, including scheduled appearance changes.
• Improved: more reliable iCloud sync status — Chronograde no longer flags a "Sync problem" for routine, self-resolving iCloud hiccups, while still clearly surfacing issues that need you (like iCloud storage being full). Your watches and measurements always stay safe on your device.
1.4.5 Jul 14
• Recycle Bin — deleting a watch now asks you to confirm, and moves it to a Recycle Bin instead of deleting it for good. Recover any watch, with its full measurement history, from Settings › Recycle Bin.
• Optional Dark app icon — choose Default, Dark, or Automatic (matches Dark Mode) in Settings › App Icon.
• Reliability improvements for backups and iCloud sync.
1.4.2 Jul 13
Chronograde Pro is now available as a monthly subscription (with a 7-day free trial), alongside the annual plan and the one-time Lifetime unlock. Plus stability improvements.
1.4.1 Jul 1
New in Chronograde 1.4
• Regulation Coach (Pro): a guided positional test that pinpoints your watch's worst position and how to regulate it.
• Measure any watch right on the Timegrapher and save the reading to its history — caliber specs fill in automatically.
• Back up and restore your entire collection to a single file.
• Ask Siri or use Shortcuts to check how a watch is running.
• Smart reminders for service-due and long-untouched watches.
• Share a caliber/movement report card.
• Clearer time entry when recording — hour, minute and seconds are now all easy-to-spin wheels.
• Stability and polish.
1.4 Jul 1
A big update for watch enthusiasts:
• Now on iPad — Chronograde is a universal app, with layouts that fit every iPhone and iPad.
• Record at any second — dial in the exact second your watch shows, not just the :00 mark, so a missed beat is no problem.
• Chronometer Score — see how each watch grades against COSC and METAS standards, estimated from your own readings.
• Accuracy by Position now spans your sessions — choose which sessions to combine, and it no longer resets when you start a new one.
• Share a beautiful accuracy card for any watch to your stories or watch forums.
• Movement database — type a caliber (ETA, Sellita, Rolex, Seiko, Omega, Miyota and more) and Chronograde fills in its beat rate, power reserve and lift angle.
• A guided first-run walkthrough, plus a gentle measuring-streak nudge.
• Choose your plan: Chronograde Pro is now available monthly, annually, or as a one-time Lifetime unlock — subscriptions include a 7-day free trial.
Reliability: Crowns are charged only when a reading is saved, iCloud sync is sturdier, and Excel export is hardened.
Questions or ideas? Email mwsupplylimited@gmail.com.
1.3 Jun 29
Pick the plan that suits you: Chronograde Pro is now available as a monthly OR annual subscription, each with a 7-day free trial.
NEW — Accuracy by Position now spans your sessions. Your watch's rate-by-position no longer resets when you start a new session: see the average across every session, and tap to choose exactly which sessions to combine.
This update also focuses on reliability:
• Extra-measurement Crowns are now charged only when a reading is saved, so you never lose Crowns if you back out of the recording screen.
• Sturdier iCloud sync, with a fix for rare duplicate sessions across devices.
• Excel exports are hardened so workbooks always open cleanly.
• General polish and stability improvements.
Questions or ideas? Email mwsupplylimited@gmail.com.
1.2 Jun 20
NEW: Accuracy by position. Tag how your watch was kept for each reading — on the wrist, lying flat, standing on its edge, or in a watch winder — and see how its rate changes with position, including the slowest-to-fastest range and the positional variation (the “delta” watchmakers use to judge how well a movement is regulated). A built-in guide explains each position.
You can now also edit a recorded measurement — fix the position, offset, or note from the watch's measurement list.
Also new: Crowns — earn them by watching an optional ad, or buy a Crown pack, to unlock extra measurements and premium themes without a subscription.
Plus polish and fixes throughout.
1.1 Jun 19
Redesigned Pro watch reports and session comparison PDFs with clearer summaries, session charts and organized histories. Your saved records and report privacy choices remain unchanged.
more Version 1.9.1 6d ago
Data Used to Track You The following data may be used to track you across apps and websites owned by other companies:
Location Identifiers Usage Data Data Linked to You The following data may be collected and linked to your identity:
Location Identifiers Usage Data Diagnostics Data Not Linked to You The following data may be collected but it is not linked to your identity: