Chronographer vs Bytefall
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Chronographer
This app helps you meticulously track the accuracy of your mechanical watches. It records time differences, calculates detailed performance metrics, and visualizes trends with charts and histograms. You can also manage your watch collection, log daily wear, and analyze positional variations.
- Track mechanical watch accuracy
- Calculate detailed performance metrics
- Visualize accuracy with charts and histograms
- Manage watch collection with notes and photos
- Log daily watch wear
- Analyze positional variation
- Export watch data
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Chronographer is for people who enjoy mechanical watches. It does two things: 1. Tracks your watches’ long-term accuracy 2. Records wrist time Chronographer can work with your whole watch collection. Give each watch a name and, optionally, a longer description. Select a picture from your Photos library and add additional notes, such as the watch’s specifications, purchase details, and service history. All information is stored in iCloud and automatically synchronized between your devices. To track a watch’s accuracy, periodically collect data points comparing its indicated time to the current correct time. Chronographer tracks offsets (the difference from the correct time) and daily rate (how many seconds it gains or loses per day). It uses this information to create graphs and histograms that help you visualize your watch’s performance over time. Chronographer also calculates the following metrics: • Average Offset • Max. Positive Offset • Max. Negative Offset • Last Offset • Net Gain/Loss • Best-Fit Rate • Average Rate • Fastest Rate • Slowest Rate • Last Rate • Rate Variance • Best-Fit Rate Drift You can log the watch (or watches) you wear each day. Chronographer’s wrist time tracking feature lets you see which watches you wear the most and how long it’s been since you’ve worn each one. You can use Chronographer to identify positional variation. When you record a data point, include the position (dial up, crown up, etc.) that the watch was stored in. Then, you can restrict the charts and metrics to specific positions and compare the results. Chronographer includes a large digital clock to help when you set your watches. For more information, including a detailed user’s guide, see https://www.rmfrance.net/chronographer
Bytefall
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Bytefall goes through your photo library and shows you what is taking up the space — with the real number, measured, after the scan. Nothing is claimed before it has been counted. WHAT IT FINDS • Exact duplicates — byte-for-byte identical copies of the same file • Similar shots — the burst of eight where you only wanted one • Screenshots — with a choice of how old: 7, 15, 30, 60 or 90 days, or all of them • Photos saved from other apps — messages, downloads, anything that did not come from your camera • Large videos — the handful of files that quietly hold most of your storage • Out-of-focus photos — optional, and off until you turn it on Every category shows how many items and how many megabytes before you decide anything. THREE WAYS TO REVIEW • Quick Sweep — one screen, the safe categories, one decision • Sets — duplicates and similar shots arrive as a group, with one kept and the rest marked • Swipe or grid — one photo at a time, or many at once with checkboxes Everything you mark goes to a basket first. Nothing is deleted until you confirm, and the basket survives closing the app, so a review of eighty sets does not have to be finished in one sitting. WHAT IT WILL NOT TOUCH Favourites, anything from the last seven days, photos in shared albums, photos you have edited, and any source you exclude are left alone. The suggested keeper in a set is a suggestion, not a verdict — you can move it. HONEST NUMBERS Storage Truth shows the free space you have now and the free space you will have afterwards, read from the device. Categories overlap — the same photo can be a duplicate and a large file at once — so the headline figure counts each photo once. An app that finds "9 GB" and frees 4 GB is doing arithmetic in its own favour. On iPhone, deleted items move to Recently Deleted and hold their space for thirty days, so the figure arrives when that album is emptied. Bytefall says so on that screen, before you confirm, rather than showing a number the phone will not honour yet. And if iCloud Photos is on, a deletion here reaches every device signed in to the same account. WHY BYTEFALL ASKS FOR ACCESS TO YOUR WHOLE LIBRARY Finding a duplicate means comparing every photo against every other photo. A picker that returns a handful of hand-picked files cannot answer the question the app exists to answer — you would have to already know which photos are duplicates in order to select them. Access is used for that comparison and nothing else. YOUR PHOTOS STAY ON YOUR PHONE No account. No sign-in. Your photos are read, compared and deleted entirely on the device. They are never uploaded — there is no server behind this app to upload them to. The app is free and shows one full-screen ad when a scan finishes — at the seam between the work and the result, never over the grid, the swipe deck or the basket, where a stray tap would cost a photograph. A single purchase removes it for good. Designer 2 j.d.o.o.
Screenshots
Verdict
The clearest difference is in-app purchases: Chronographer at none against Bytefall's 1. Chronographer also leads on ads (none vs shown). Bytefall's advantage is update cadence (every 2 weeks vs every 2 months) and iOS requirement (15.0 vs 18.6). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Bytefall sells 1 one-off in-app purchase. Chronographer asks for nothing beyond the download.
Chronographer ships an update every 2 months, Bytefall every 2 weeks. The most recent releases landed on September 30, 2026 and October 1, 2026 respectively.
| Parameter | Chronographer | Bytefall |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (4 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 18.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Robert France | Designer2 jdoo |
In-app purchases
Chronographer
No in-app purchases
Bytefall
- Remove ads$6.99









