Atomic Exact Time vs Simple Clock JP
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Atomic Exact Time
Synchronize your device's clock with network time sources, view its offset, and use a corrected display. Features include countdown timers, team targets, and world clocks. Optional Pro plans offer advanced features and ad removal.
- Network time synchronization
- Offset and uncertainty measurement
- Corrected clock display
- Countdown timers
- Team countdown sharing
- World clocks
- Home-screen widget
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See your device clock in context with Atomic Exact Time. Compare it with network time sources, view the measured offset and estimated uncertainty, and use a corrected clock display. Start with the free clock and synchronization tools. The free version includes ads. Optional Pro plans remove ads and unlock precision targets, team countdowns, detailed accuracy reports, Theme Studio, timecode and export tools. Prepare a start: choose an exact time or a duration, check calibration and notification permissions, and test the sound before starting. Save, edit, duplicate and reorder your frequent targets. Share a team target through a link or QR code. Each participant uses their own device calibration. Participant attendance and location are not tracked. Use world clocks, Studio Mode, accessibility preferences and a home-screen widget that shows the latest calibration. Choose from 15 interface languages. Timing accuracy depends on network conditions, device behavior and measurement quality. Uncertainty is an estimate, not a guarantee. Keep the app open for the best countdown timing. Background notification delivery depends on the operating system. Available Pro plans and localized prices are supplied by your store. Monthly and yearly subscriptions renew automatically until canceled in store account settings. A lifetime purchase is a single payment when offered. Restore Purchases is available. No app account is required. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Simple Clock JP
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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
Verdict
The clearest difference is in-app purchases: Simple Clock JP at none against Atomic Exact Time's 3. Simple Clock JP also leads on ads (none vs shown). Atomic Exact Time's advantage is device support (4 vs 2). On price, update cadence and iOS requirement 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. Atomic Exact Time sells 3 in-app purchases, starting at $2.99 per month. Simple Clock JP asks for nothing beyond the download.
Atomic Exact Time ships an update every 5 weeks, Simple Clock JP every 4 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.
| Parameter | Atomic Exact Time | Simple Clock JP |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 weeks | Every 4 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Mac, Apple TV — better | iPhone, iPad |
| Requires iOS | 16.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 56 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | SUPER KIM KIMYA VE TEKSTIL SANAYI TICARET LIMITED SIRKETI | Kantaro Kobayashi |
In-app purchases
Atomic Exact Time
- Atomic Exact Time Pro7 Days trial$2.991 Month
- Pro Yearly$19.991 Year
- Atomic Exact Time Pro$2.99
Simple Clock JP
No in-app purchases
Questions
Is Atomic Exact Time free?
Is Simple Clock JP free?
Do Atomic Exact Time or Simple Clock JP have ads?
Which is updated more often, Atomic Exact Time or Simple Clock JP?
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