Comparison

Chess Clock Free vs Calendar Clock

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

Head to head
About

Chess Clock Free

This application functions as a digital timer for two players, ideal for games like chess. It ensures fair play by tracking individual move times and preventing excessive delays. The timer can count up or down and operates in the background.

Highlights
  • Dual player time tracking
  • Count up or down timer
  • Pause functionality
  • Background operation
  • Customizable time settings
Features
Read full description

A chess clock consists of two connected clocks which can't run at the same time. Use it as a game clock to measure the time used by two players for their moves e.g. in game of chess. Stopping one clock will start the other one. The purpose is to keep track of the total time each player takes for his or her own moves, and ensure that neither player overly delays the game. Features: - choose the same time for both players or individually - count the time down or up - pause the clock for both players - runs in the background while the app is closed - support for the iPhone 6 and 6+

About

Calendar Clock

This app displays the current year, month, week, and time on a single screen with a clean design. It offers customizable theme colors and functions as a desk clock. The app disables device sleep mode while active.

Highlights
  • All-in-one screen display
  • Year, month, week, day, hour, minute, second
  • Switchable theme colors (dark, light, green, blue)
  • Disables device sleep mode
  • Acts as a desk clock
Features
Read full description

Time and date, beautifully together. Calendar Clock is a simple, elegant time-and-calendar app designed for iPhone and iPad. See the current time and the entire month at a glance, with a clean interface that stays out of your way. Features * Large digital clock — View the current system time clearly and instantly. * 24-hour or 12-hour format — Swipe across the clock to switch between 24-hour and AM/PM formats. * Monthly calendar — See the full month with the current year and month displayed above it. * Swipe through months — Swipe left or right on the calendar to move between months. * Today at a glance — Today's date is highlighted with a red circle. * Weekend highlighting — Saturdays and Sundays are displayed in red. * Multiple themes — Swipe up or down to change the screen theme. * Remembers your preferences — Your selected clock format and theme are preserved. * iPhone & iPad — Designed for both iPhone and iPad. Simple by design No complicated menus. No unnecessary controls. Just the time and the calendar, exactly when you need them. Calendar Clock — See time. See your day. Note that this application disables your device's sleep mode while running, so make sure you have enough battery life. *Important notice: Use the information recoded or functionality provided in / or generated with this application only as a rough indication, rough estimates or as a rough guide. Even though we do our best to provide you with confirmed information and tried-and-tested features, the accuracy and successful operation and performance of the application are NOT GUARANTEED by us. Users are strongly advised to confirm the information of their interest with other sources and not to ultimately rely on functionality and performance of this application. This application is provided “as is” and with all faults. You bear the risk of using it. We shall not be responsible or liable for any loss or damage of any kind incurred as a result of the use of functions or the content of this application. By using this application you are agreeing to these terms. If you do not agree to these terms do not use this application.

Screenshots

Chess Clock Free4 screens
Calendar Clock4 screens

Verdict

The call

The clearest difference is price: Chess Clock Free at Free against Calendar Clock's $0.99. Chess Clock Free also leads on update cadence (every 10 months vs every 41 months) and review sentiment (15% vs 0%). Calendar Clock's advantage is in-app purchases (none vs 1). On 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

CostPrice · In-app purchases · Ads · Monetization

Chess Clock Free is free to download; Calendar Clock costs $0.99 up front. Chess Clock Free sells 1 one-off in-app purchase. Calendar Clock asks for nothing beyond the download.

UpkeepUpdate frequency

Chess Clock Free ships an update every 10 months, Calendar Clock every 41 months. The most recent releases landed on October 10, 2026 and October 15, 2026 respectively.

Scorecard6 real differences · 4 level
Chess Clock Free versus Calendar Clock: the parameters behind the verdict, then further details
ParameterChess Clock FreeCalendar Clock
PriceFree — better$0.99
Rating5.0 (1 ratings) — better—
Positive reviews15.4% of reviews — better0.0% of reviews
Number of ratings1 — better—
Update frequencyEvery 10 months — betterEvery 41 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS5.1.1 — better26.5
Further details — not scored
Size18 MB4 MB
Age rating4+4+
DeveloperPiet JonasSystemiko Inc.

Customer experience

Chess Clock Free

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews26 reviews
Positive15.4%
Neutral7.7%
Negative76.9%

Calendar Clock

Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

Chess Clock Free

One-time1
  • Chess Clock Upgrade$0.99
None

Calendar Clock

No in-app purchases

Questions

Is Chess Clock Free free?
Chess Clock Free is free to download, with in-app purchases available.
Is Calendar Clock free?
Calendar Clock costs $0.99, with no in-app purchases.
Do Chess Clock Free or Calendar Clock have ads?
Neither Chess Clock Free nor Calendar Clock shows ads.
Which is updated more often, Chess Clock Free or Calendar Clock?
Chess Clock Free ships an update every 10 months, and Calendar Clock every 41 months. Most recently, Chess Clock Free was updated on October 10, 2026 and Calendar Clock on October 15, 2026.

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