Comparison

Age Checker vs Diamond X2

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

Head to head
About

Age Checker

Easily calculate your exact age, including full years and days elapsed since birth. It also shows days remaining until your next birthday and can store age information for multiple individuals. Ideal for quick age verification and personal tracking.

Highlights
  • Calculate full age
  • Calculate counting year
  • Display elapsed days
  • Display remaining days to next birthday
  • Store age information
Features
Read full description

Age checker is an age calculation tool that you can easily check "how old are you?" And "how old are you then?" When you enter your birthday and base date (today) you can see how old you are with "full age" and "count year". ◎ Example of age calculation · Age written in resume · Age of passport · Confirmation of annoyance · Check the age of employees · Age verification of animated character · Celebrity's age check · Age verification at the time of submitting documents and reports · Age verification at the time of ceremonial occasion · Age verification for family tree creation · Age check of milestones to celebrate longevity ◎ Main functions · Display of "full age" and "counting year" · Display of elapsed days since birth · Display remaining days until the next birthday · Age information storage function

About

Diamond X2

Features
Read full description

This app is the successor to "Diamond X" and makes it easy to find the date and time of Diamond Fuji. Use GPS and web maps to create diamonds from any location. Diamonds other than Mount Fuji are also supported. Built-in data for over 1,200 mountains across Japan, as well as the Tokyo Metropolitan Government Building Observatory, Tokyo Tower, Tokyo Skytree, and more. Like "Yamaotaku for Mac (Yamac)," it takes into account the Earth's curvature and atmospheric refraction to provide highly accurate results. Supports Japanese and English display, automatically switching based on your iPhone's language setting. Location data files can be shared with Mac and Windows. Differences from "Diamond X" 1. Diamond-eligible locations are now checked in the location selection list. This allows you to quickly find diamond-eligible locations. Calculation speed has been significantly improved, allowing for stress-free use of this feature. 2. Mount Fuji can now be displayed from any location, regardless of whether diamonds are available. 3. The sun's altitude and shape reflect atmospheric refraction. (At low altitudes, the display will be compressed vertically.) 4. Sunrise and sunset times for a specified period can be displayed as a list. 5. Improved support for calculation errors. 6. Improved calculation accuracy. 7. Multi-core support significantly improves calculation processing performance. 8. Added a function to transfer calculation results to other apps. 9. The UTC offset corresponding to the viewpoint's time zone can now be set automatically or manually, enabling support for time zones other than Japan. 10. Help is now available for some functions. (Tap the ? icon to display it.) 11. Instructions for sharing files with your PC, such as myData, are now displayed. 12. Support for more languages ​​is now available. 13. Added an on/off switch for transparency. 14. Diamond offset display can now be selected between "meters" and "degrees." 15. Added a new switch for resetting settings.

Screenshots

Age Checker3 screens
Diamond X24 screens

Verdict

The call

The clearest difference is price: Age Checker at Free against Diamond X2's $4.99. Diamond X2's advantage is in-app purchases (none vs 1) and ads (none vs shown). On 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

Age Checker is free to download; Diamond X2 costs $4.99 up front. Age Checker sells 1 one-off in-app purchase. Diamond X2 asks for nothing beyond the download.

UpkeepUpdate frequency

Age Checker ships an update every 3 months, Diamond X2 every 4 days. The most recent releases landed on November 2, 2026 and November 8, 2026 respectively.

Scorecard5 real differences · 5 level
Age Checker versus Diamond X2: the parameters behind the verdict, then further details
ParameterAge CheckerDiamond X2
PriceFree — better$4.99
Rating5.0 (11 ratings) — better—
Positive reviews33.3% of reviews—
Number of ratings11 — better—
Update frequencyEvery 3 monthsEvery 4 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.014.0 — better
Further details — not scored
Size28 MB15 MB
Age rating4+4+
Developermitsuhiro naraICHIROU YONEYAMA

In-app purchases

1 purchases

Age Checker

One-time1
  • Remove Ads$3.99
None

Diamond X2

No in-app purchases

Questions

Is Age Checker free?
Age Checker is free to download, with in-app purchases available.
Is Diamond X2 free?
Diamond X2 costs $4.99, with no in-app purchases.
Do Age Checker or Diamond X2 have ads?
Age Checker shows ads; Diamond X2 does not.
Which is updated more often, Age Checker or Diamond X2?
Age Checker ships an update every 3 months, and Diamond X2 every 4 days. Most recently, Age Checker was updated on November 2, 2026 and Diamond X2 on November 8, 2026.

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