Comparison

The Date Calculator PRO vs Strange Clocks

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

Head to head
About

The Date Calculator PRO

Easily calculate the duration between two dates, with or without accounting for the time of day. You can also add or subtract various time units from a specific date. The results are automatically converted into multiple units for your convenience.

Highlights
  • Calculate duration between two dates
  • Include time of day in calculations
  • Add/subtract years, months, weeks, days
  • Convert results to various time units
  • Account for daylight saving time changes
Features
Read full description

Date Calculator – Days, Time & Countdowns Download now for free! Wondering how many days are between two dates, what date it will be in 90 days, or how much time remains until an important event? Date Calculator gives you clear answers in a streamlined iOS experience for iPhone and iPad. Calculate date differences, determine exact time spans, add or subtract time from any date, and keep track of upcoming events with countdowns and widgets. DATE AND TIME CALCULATIONS • Calculate the number of days between two dates • Optionally include the end date in the calculation • Calculate the exact duration between two dates and times • Add or subtract years, months, weeks, and days from any date • View results in years, months, weeks, days, hours, minutes, and seconds • See total durations expressed in days, hours, minutes, and seconds • Calculate business and working days • Display calendar week numbers • Account for daylight saving time and standard time transitions COUNTDOWNS AND WIDGETS Turn a calculated date into a countdown and see how much time remains until a birthday, anniversary, deadline, vacation, appointment, or other important event. • Create and manage multiple countdowns • View remaining years, months, weeks, days, hours, minutes, and seconds • Add countdown widgets to your iPhone or iPad Home Screen • Use Lock Screen widgets to keep important dates visible at a glance • Add multiple widgets and choose which saved event each widget displays SAVE AND REUSE YOUR RESULTS • Add a calculated date directly to your iPhone or iPad calendar • Copy calculation results to the clipboard • Share results with other apps • Reopen recent calculations from the calculation history Date Calculator is useful for due dates, deadlines, birthdays, anniversaries, vacations, project planning, notice periods, and everyday date calculations. Your date calculations are performed locally on your device. Download Date Calculator for free and make date and time calculations easier on iPhone and iPad. Disclaimer: Although every reasonable effort has been made to make this application as accurate as possible, all calculations and other content are provided for informational purposes only and must always be checked manually. We do not guarantee that any information, calculation, or other content is complete or entirely accurate. Therefore, the developer, author, publisher, and owners cannot be held responsible for any errors, omissions, or inaccuracies. Standard Apple Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Strange Clocks

Features
Read full description

Strange Clocks turns "what time is it?" into a small daily puzzle. Instead of one clock face, you get 15, each a different, real way humans (and machines) have told time throughout history: from a Cold War-era German clock made of lamps to the way a resistor's color bands encode a number. Every clock is stranger than the last, but none of them stay strange for long. Each one ships with a short animated guide that highlights exactly what to read and when, plus a live calculation line so you can watch the math happen in real time. WHAT'S INSIDE - 15 unusual clocks: Berlin Clock, Word Clock, Binary Clock, Cistercian Clock, Fibonacci Clock, Tix Clock, Hex Clock, Maya Clock, Moon Clock, Polar Clock, Resistor Clock, Decimal Time, Internet Time, Roman Hours, and the Prague Orloj. - An animated how-to-read guide for every single clock, no exceptions. - Widgets for Home Screen, Lock Screen, and StandBy, in small and medium sizes. - Clock Wall mode: turn your iPhone, or the inner display of iPhone Duo, into a live wall of clocks, screensaver-style. - 10 languages: English, Spanish, Simplified Chinese, Japanese, German, French, Brazilian Portuguese, Russian, Korean, and Italian. ONE CLOCK ON US Pick any clock as your gift and keep it free, forever: live in the app, on your widgets, and in StandBy. Every how-to-read guide is free for all 15. Want them all? A single one-time purchase of $1.99 unlocks every clock. No subscription, no recurring charges, no ads, and no tracking, ever. PRIVACY Strange Clocks doesn't collect your data. The one place it asks for location, to compute local sunrise and sunset for the Roman Hours clock, is used entirely on your device and never leaves it. Fifteen clocks. One phone. Zero reasons to know what time it "normally" is.

Screenshots

The Date Calculator PRO4 screens
Strange Clocks4 screens

Verdict

The call

The clearest difference is ads: Strange Clocks at none against The Date Calculator PRO's shown. Strange Clocks also leads on update cadence (every 3 days vs every 4 months). 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. The Date Calculator PRO sells 7 in-app purchases, starting at $1.99 per 7 days and Strange Clocks sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

The Date Calculator PRO ships an update every 4 months, Strange Clocks every 3 days. The most recent releases landed on October 26, 2026 and October 16, 2026 respectively.

Scorecard2 real differences · 8 level
The Date Calculator PRO versus Strange Clocks: the parameters behind the verdict, then further details
ParameterThe Date Calculator PROStrange Clocks
PriceFreeFree
Rating4.7 (2.6K ratings) — better—
Positive reviews65.5% of reviews—
Number of ratings2.6K — better—
Update frequencyEvery 4 monthsEvery 3 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017.0 — better
Further details — not scored
Size7 MB9 MB
Age rating4+4+
DeveloperBrachmann Online Marketing GmbH & Co. KGKIP Networks

In-app purchases

7 purchases

The Date Calculator PRO

Subscriptions3
  • Premium$1.997 Days
  • Premium1 Year trial$3.991 Month
  • Premium$3.991 Month
One-time4
  • Voluntary Payment 1$0.99
  • Voluntary Payment 2$2.99
  • Voluntary Payment 3$9.99
Show 1 more
  • Remove Ads$12.99
1 purchases

Strange Clocks

One-time1
  • Unlock all 15 clocks$1.99

Questions

Is The Date Calculator PRO free?
The Date Calculator PRO is free to download, with in-app purchases available.
Is Strange Clocks free?
Strange Clocks is free to download, with in-app purchases available.
Do The Date Calculator PRO or Strange Clocks have ads?
The Date Calculator PRO shows ads; Strange Clocks does not.
Which is updated more often, The Date Calculator PRO or Strange Clocks?
The Date Calculator PRO ships an update every 4 months, and Strange Clocks every 3 days. Most recently, The Date Calculator PRO was updated on October 26, 2026 and Strange Clocks on October 16, 2026.

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