Comparison

WatchM3 vs Castomètre

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

WatchM3

Features
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WatchM3 turns your iPhone, iPad, Mac, Apple TV or Apple Vision Pro into a bedside clock, and your Apple Watch into a weather face: the time, all night long, and nothing else on screen. THREE CLOCK FACES Swipe from right to left to switch between them (arrow keys on Mac, the remote on Apple TV): • Digits: the original WatchM3 face, with large pale digits and a blinking colon. • LED panel: a pixel clock in warm white, with a seconds chaser that runs around the edge of the screen, one lap per minute. • Weather: the time in large digits, the day fading away around the edge of the screen from sunrise to sunset, the temperature with today's high, low and feels-like, wind and gusts, humidity, UV index, pressure, severe weather warnings, the next twelve hours with the chance of rain, sunrise, sunset and the moon phase. APPLE WATCH On your watch, WatchM3 shows a full-screen face under the watch's own time: the day fading away around the edge of the screen, current weather with today's high and low, wind and gusts, and the next six hours. Four complications for Apple watch faces: the day, the next sunrise or sunset, and the weather. MADE FOR THE NIGHT • Swipe up or down to adjust the brightness of the clock. Keep swiping down past the minimum to dim the screen itself, below its usual lowest setting. • Pinch to make the time bigger or smaller. • Size and brightness are remembered for each face. • No status bar, no buttons, no menus, and a black launch screen. • Your device never goes to sleep or locks while WatchM3 is open. • Kind to OLED screens: the faces shift slightly every minute and the time moves every hour. EVERY SCREEN iPhone in landscape, iPad in portrait and landscape, a resizable window or full screen on Mac, your TV screen with Apple TV, a window in your space on Apple Vision Pro. On Apple TV, press left or right on the remote to switch faces and up or down to adjust brightness; no screen saver while WatchM3 is on screen. Folded like a tent, iPhone Duo shows the time on its outer display; set up like a laptop, on the upper half of the screen; opened like a book, the time on one page and the weather on the other. WEATHER AND PRIVACY Weather data comes from Apple's weather service. Your location is used only to get the local weather and the sunrise and sunset times; it is never sent to us. No account, no ads, no tracking.

About

Castomètre

Features
Read full description

Castomètre vous permet de scanner facilement une pièce de votre domicile et d'en récupérer les dimensions dans notre outil 3D sur https://logiciels-conception.castorama.fr

Screenshots

WatchM33 screens
Castomètre1 screens

Verdict

The call

The clearest difference is device support: WatchM3 at 5 against Castomètre's 2. Castomètre's advantage is iOS requirement (16.2 vs 27.0). On price, update cadence, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 8, 2026 and November 9, 2026 respectively.

Scorecard2 real differences · 4 level
WatchM3 versus Castomètre: the parameters behind the verdict, then further details
ParameterWatchM3Castomètre
PriceFreeFree
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, Mac, Apple Watch, Vision Pro — betteriPhone, iPad
Requires iOS27.016.2 — better
Further details — not scored
Size2 MB4 MB
Age rating4+4+
DeveloperDavid LaroseCASTORAMA FRANCE

In-app purchases

None

WatchM3

No in-app purchases

None

Castomètre

No in-app purchases

Questions

Is WatchM3 free?
WatchM3 is free to download, with no in-app purchases.
Is Castomètre free?
Castomètre is free to download, with no in-app purchases.
Do WatchM3 or Castomètre have ads?
Neither WatchM3 nor Castomètre shows ads.
Which is updated more often, WatchM3 or Castomètre?
WatchM3 ships an update every 3 weeks, and Castomètre every 3 weeks. Most recently, WatchM3 was updated on November 8, 2026 and Castomètre on November 9, 2026.

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