Comparison

Watchism vs Simple Clock JP

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

Head to head
About

Watchism

This app provides a precise reference clock using various network time sources and a private digital vault for documenting your watch collection. Track wear, view insights, manage wishlists, and store photos and notes securely on your device.

Highlights
  • Precise reference clock
  • Multiple time source options
  • On-device watch collection vault
  • Wear tracking and insights
  • Wishlist management
  • Photo and note storage
  • Browser integration for online watches
Features
Read full description

Watchism is a privacy-first iPhone app for people who care about trustworthy time and the watches they live with. The Clock gives you a disciplined local reference time built from traditional NTP, HTTPS Date, or Roughtime as the selected primary source, followed by enabled fallback methods in a visible consultation order. Watchism keeps uncertainty visible, shows the active reference source, and helps you understand how much precision the app can honestly defend. The Watches area is an on-device collection workspace for documenting watches, organizing photos, maintaining a wishlist, and recording timing observations. You can add watches manually, attach photos from the camera or photo library, crop images while preserving originals, and review measurements in a way that stays grounded in the actual reference clock. Watchism also helps you understand your collection over time. Track wear logs, open Wear Insights for 30-day, 180-day, and all-time views by watch, weekday, and rotation balance, and keep archival context for pieces that have left the collection. Private pricing and valuation history can be grouped by currency, with amounts hidden when you want the summary without exposing the numbers. Wishlist entries stay separate from owned-watch timing workflows and instead focus on acquisition priority and research. Built-in browser tools make it easy to save interesting watches you discover online, attach brand imagery to watches you already own, and carry forward useful page context into your notes. Metadata suggestions are best-effort and on-device where possible, with the user always in control of the final saved record. Privacy is the point, not a footnote. Watch data, measurements, photos, layouts, saved zones, and boutique notes stay on-device. Watchism does not use analytics, ad SDKs, or hidden telemetry. Network access is limited to configured reference-time endpoints for the selected primary source and any enabled fallback sources such as NTP, HTTPS Date, or Roughtime, plus explicit user actions such as opening watch websites or importing a selected browser image. Whether you want a trustworthy reference clock, a serious watch vault, or both in one place, Watchism is built to stay clear, honest, and local.

About

Simple Clock JP

Features
Read full description

Simple Clock JP shows the current time in large, bold digits, easy to read at a glance from across the room or the stage. Just open the app and the clock is there. No setup, no complicated controls. Features - Large, easy-to-read time display - Shows hours, minutes, and seconds - Date and day of the week - Simple black background - The screen stays on while the clock is shown - On iPad, resize the window freely and place it next to your sheet music or set list app - Picture in Picture: float a compact clock over any other app - No ads, no account, no setup Use it as a desk clock, at work, at events, or on stage whenever you want to see the time in big numbers. A simple clock made for one thing: showing the time, big.

Screenshots

Watchism4 screens
Simple Clock JP1 screens

Verdict

The call

The clearest difference is update cadence: Watchism at every 5 days against Simple Clock JP's every 4 weeks. Simple Clock JP's advantage is iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases 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

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

Watchism ships an update every 5 days, Simple Clock JP every 4 weeks. The most recent releases landed on October 14, 2026 and October 4, 2026 respectively.

Scorecard2 real differences · 8 level
Watchism versus Simple Clock JP: the parameters behind the verdict, then further details
ParameterWatchismSimple Clock JP
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 5 days — betterEvery 4 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhoneiPhone, iPad — better
Requires iOS26.017.0 — better
Further details — not scored
Size12 MB0 MB
Age rating17+4+
DeveloperAldo GonzalezKantaro Kobayashi

In-app purchases

None

Watchism

No in-app purchases

None

Simple Clock JP

No in-app purchases

Questions

Is Watchism free?
Watchism is free to download, with no in-app purchases.
Is Simple Clock JP free?
Simple Clock JP is free to download, with no in-app purchases.
Do Watchism or Simple Clock JP have ads?
Neither Watchism nor Simple Clock JP shows ads.
Which is updated more often, Watchism or Simple Clock JP?
Watchism ships an update every 5 days, and Simple Clock JP every 4 weeks. Most recently, Watchism was updated on October 14, 2026 and Simple Clock JP on October 4, 2026.

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