# DateDiff vs SJ Age Calculator

The clearest difference is in-app purchases: DateDiff at none against SJ Age Calculator's 5. DateDiff also leads on ratings volume (4 vs 1) and iOS requirement (9.0 vs 16.0). SJ Age Calculator's advantage is update cadence (every 5 days vs every 5 weeks). On price, rating, ads and device support there is nothing between them.

Both are free to download. SJ Age Calculator sells 5 one-off in-app purchases. DateDiff asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for DateDiff against 5.0 for SJ Age Calculator. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

DateDiff ships an update every 5 weeks, SJ Age Calculator every 5 days. The most recent releases landed on October 20, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | DateDiff | SJ Age Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/datediff/id1164312493/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/sj-age-calculator/id6563151005/reviews) |
| Number of ratings | **4** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 weeks | **Every 5 days** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 52 MB | 3 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [David Vives](https://appshunter.io/developer/1164312492) | [Stephane JAILLIARD](https://appshunter.io/developer/1749751077) |

## What reviewers say

### DateDiff

[App page](https://appshunter.io/ios/app/datediff/id1164312493)

Calculate the duration between two dates, with options to include or exclude weekends. It can also determine an end date based on a start date and a duration, or function as a countdown timer from today to a specific event.

**Highlights:** Calculate days between two dates, Include or exclude weekends, Calculate end date from start date and duration, Countdown timer from today, Pin start date as today

**In-app purchases:** none


### SJ Age Calculator

[App page](https://appshunter.io/ios/app/sj-age-calculator/id6563151005)

Quickly determine a client's age group and associated benefits based on their birth year. Ideal for professionals in industries like travel and hospitality needing to apply age-based rules instantly and accurately.

**Highlights:** Instant age group identification, Display associated rights/benefits, Customizable age groups and ranges, Manage multiple rule profiles, Fast, simple, and efficient design, Clear interface for professional use

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A coffee | $0.99 | one-time |
| A cookie | $2.99 | one-time |
| No ads | $4.99 | one-time |
| A lemon tart | $4.99 | one-time |
| A pizza | $9.99 | one-time |


## Frequently asked questions

### Is DateDiff free?

DateDiff is free to download, with no in-app purchases.

### Is SJ Age Calculator free?

SJ Age Calculator is free to download, with in-app purchases available.

### Which has better reviews, DateDiff or SJ Age Calculator?

DateDiff and SJ Age Calculator are both rated 5.0 out of 5 on the App Store, from 4 and 1 ratings respectively.

### Do DateDiff or SJ Age Calculator have ads?

Both DateDiff and SJ Age Calculator show ads.

### Which is updated more often, DateDiff or SJ Age Calculator?

DateDiff ships an update every 5 weeks, and SJ Age Calculator every 5 days. Most recently, DateDiff was updated on October 20, 2026 and SJ Age Calculator on October 23, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*