Comparison

SimpleClock vs Millisecond Clock

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

Head to head
About

SimpleClock

A customizable clock app designed for studying, offering a clean interface with no ads or charges. Personalize the background, font, and text color, and utilize built-in stopwatch and timer functions. Widgets are now available for enhanced convenience.

Highlights
  • Customizable clock appearance
  • No ads or charges
  • Stopwatch function
  • Timer function
  • Widget support
  • Dark mode support
Features
Read full description

Widgets are now available! Dark mode support, no ads, no charges. All functions are free of charge. - A simple clock that is perfect for studying! - You can change the background photo, font, and color of the text to customize the clock to your liking. - Stopwatch function and timer function! - Widgets* are now available! * To use the widgets, you need a device with iOS 14 or later or iPadOS 14 or later. -------------------------------------------- If you have any problems, please contact us using the support form below or "Help" in the app. https://support.reoapp.com/form Privacy Policy https://support.reoapp.com/clock/en Support email address support[at]reoapp.com *Please replace [at] with @ when sending email. --------------------------------------------

About

Millisecond Clock

This app displays the most accurate time available, down to the millisecond. It's useful for measuring network delays or video streaming lag by comparing displayed time differences.

Highlights
  • Millisecond precision time display
  • Accurate timekeeping for iPhone and iPad
  • Network delay measurement
  • Video streaming lag analysis
  • Free to download
Features
Read full description

Millisecond Clock shows the exact time down to 1/1000 of a second, accurate enough to measure real delay in cameras, video streams, and network connections. Point a camera at the screen and compare it to another display: the difference in milliseconds tells you exactly how much latency you are dealing with. Beyond precision, Millisecond Clock is a clock you can make your own. Every part of it, from color and font to position on screen, is yours to design. DESIGN YOUR CLOCK- 13 built-in color themes, or create unlimited custom themes with the full color picker - 30 fonts, from the classic digital LED look to elegant serif and rounded styles - Adjustable glow and shadow effects for extra depth - Drag the clock, date, and weekday anywhere on screen, and resize each one independently STAY ON TIME, YOUR WAY- 12-hour or 24-hour time, with an optional blinking colon - 9 date formats to match how you write dates - Show or hide the date and day of the week - Toggle the millisecond display on or off BUILT TO STAY ON SCREEN- Keeps your screen awake so the clock is always visible - A true universal app, designed for both iPhone and iPad Millisecond Clock is free to use, supported by ads. A one-time in-app purchase removes ads and unlocks every premium theme, no subscription required.

Screenshots

SimpleClock4 screens
Millisecond Clock4 screens

Verdict

The call

The clearest difference is ads: SimpleClock at none against Millisecond Clock's shown. SimpleClock also leads on update cadence (every 2 weeks vs every 6 months) and review sentiment (100% vs 73%). Millisecond Clock's advantage is ratings volume (131 vs 3). On price, in-app purchases, device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SimpleClock sells 3 one-off in-app purchases and Millisecond Clock sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

SimpleClock holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Millisecond Clock has 131 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 100% of SimpleClock's written reviews are positive against 73% of Millisecond Clock's.

UpkeepUpdate frequency

SimpleClock ships an update every 2 weeks, Millisecond Clock every 6 months. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.

Scorecard6 real differences · 4 level
SimpleClock versus Millisecond Clock: the parameters behind the verdict, then further details
ParameterSimpleClockMillisecond Clock
PriceFreeFree
Rating5.0 (3 ratings) — better4.7 (131 ratings)
Positive reviews100.0% of reviews — better72.7% of reviews
Number of ratings3131 — better
Update frequencyEvery 2 weeks — betterEvery 6 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size11 MB4 MB
Age rating4+4+
DeveloperReo ShigenoChia-Chun Hsieh

Customer experience

SimpleClock

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Millisecond Clock

All ratings131 ratings
Positive93.1%
Neutral2.3%
Negative4.6%
Written reviews11 reviews
Positive72.7%
Neutral18.2%
Negative9.1%

In-app purchases

3 purchases

SimpleClock

One-time3
  • Cheer for the developer$0.49
  • Cheer for the developer$2.99
  • Cheer for the developer$5.99
3 purchases

Millisecond Clock

One-time3
  • Remove Ads$0.99
  • Special Offer Package$2.99
  • Unlock Themes$3.99

Questions

Is SimpleClock free?
SimpleClock is free to download, with in-app purchases available.
Is Millisecond Clock free?
Millisecond Clock is free to download, with in-app purchases available.
Which has better reviews, SimpleClock or Millisecond Clock?
SimpleClock is rated higher. SimpleClock averages 5.0 out of 5 from 3 ratings, while Millisecond Clock averages 4.7 from 131 ratings.
Do SimpleClock or Millisecond Clock have ads?
Millisecond Clock shows ads; SimpleClock does not.
Which is updated more often, SimpleClock or Millisecond Clock?
SimpleClock ships an update every 2 weeks, and Millisecond Clock every 6 months. Most recently, SimpleClock was updated on October 1, 2026 and Millisecond Clock on October 14, 2026.

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