ChronoSync vs Lux Light Meter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ChronoSync
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Set your mechanical watch to the second. Pull the crown. Watch the countdown. The phone taps in your hand at zero, so your eyes never have to leave the dial. No mental arithmetic, no settling for close enough. Then there are the other four faces. A GMT that tracks a second timezone, a dive bezel you can actually rotate, a chronograph that runs, a moonphase that knows what tonight looks like. Each one comes with a short guide to what the complication does and how to use it — the parts a watch manual assumes you already know. What's inside A countdown to the exact second, with a tap in your hand at zero Five faces: Day-Date, GMT, Moonphase, Dive, Chronograph Controls that behave like the real thing — pick a second timezone, turn the bezel, run the chronograph Plain-language guides to every complication, including how to set a date without hurting the movement A Home Screen widget in the same style, that opens straight to the face you tapped No account, no analytics, nothing to sign up for. Go set your watch. Then stop thinking about it.
Lux Light Meter
Measure ambient light levels with your iPhone. Get real-time lux and foot-candle readings, with specialized modes for photography and plant care. Track light history and calibrate for accuracy.
- Ambient light metering (lux/fc)
- Photography exposure suggestions
- Plant light (PPFD/DLI) estimation
- Continuous measurement and history
- Optional meter calibration
- Privacy-friendly local storage
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Lux Light Meter: Illuminance A practical lux and illuminance meter for iPhone. Measure ambient light in seconds, check if a room is bright enough for study, work, or home use, and get helpful exposure and plant-lighting guidance when you need it. Core metering works offline. Key Features: Ambient light metering - Live lux / fc readings with scene targets that tell you if the light is too dim, about right, or too bright — plus simple tips to adjust Photography mode (Pro) - Aperture- or shutter-priority suggestions with ISO and exposure compensation so you can dial in exposure faster Plant mode (Pro) - Estimate PPFD and DLI for common houseplants, with light source and daily photoperiod options Continuous measure & history - Save single readings, track how light changes over time, and review min, average, and max values Optional calibration - Fine-tune against a trusted meter; Pro saves separate factors for the front and rear cameras Units & privacy-friendly storage - Switch between lux and fc; your measurements stay on your device How to Use: Open the app, allow camera access, and point your iPhone at the area you want to measure. Switch between Environment, Photography, and Plant modes, then save a reading or run a continuous measurement when you need a longer sample. Subscription Options: * Weekly and yearly subscriptions, plus a lifetime purchase * Payment will be charged to your Apple ID account * Subscriptions renew automatically within 24 hours before the current period ends * Manage or cancel anytime in your Account Settings Clearer readings. Better light decisions. Terms of Use: https://lightmeter.xzonesoft.com/terms.html Privacy Policy: https://lightmeter.xzonesoft.com/privacy.html Contact Us: support@xzonesoft.com
Screenshots
Verdict
The clearest difference is in-app purchases: ChronoSync at none against Lux Light Meter's 3. Lux Light Meter's advantage is update cadence (fortnightly vs every 3 months) and iOS requirement (17 vs 26.0). On price, ads 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. Lux Light Meter sells 3 in-app purchases, starting at $1.99 per 7 days. ChronoSync asks for nothing beyond the download.
ChronoSync ships an update every 3 months, Lux Light Meter fortnightly. The most recent releases landed on October 4, 2026 and October 8, 2026 respectively.
| Parameter | ChronoSync | Lux Light Meter |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (5 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 5 — better |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 17 — better |
| Further details — not scored | ||
| Size | 3 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Dominic McPhee | 灿耿 陈 |
In-app purchases
ChronoSync
No in-app purchases
Lux Light Meter
- Weekly Access$1.997 Days
- Annual Subscription$7.991 Year
- Lifetime Access$4.99









