# When vs Ducker Detective

The clearest difference is review sentiment: Ducker Detective at 100% against When's 60%. Ducker Detective also leads on ratings volume (24 vs 1). When's advantage is in-app purchases (none vs 10) and rating (5.0 vs 4.8). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Ducker Detective sells 10 in-app purchases, starting at $0.99 per month. When asks for nothing beyond the download.

When holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Ducker Detective has 24 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 60% of When's written reviews are positive against 100% of Ducker Detective's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | When | Ducker Detective |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/when-anniversary-remembrancer/id565903649/reviews)** | [4.8 (24 ratings)](https://appshunter.io/ios/app/ducker-detective/id1555299893/reviews) |
| Number of ratings | 1 | **24** |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 100 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nomtek sp. z o.o.](https://appshunter.io/developer/1698128896) | [Ducker Detective, LLC](https://appshunter.io/developer/1555299895) |

## What reviewers say

### When

[App page](https://appshunter.io/ios/app/when-anniversary-remembrancer/id565903649)

This app helps you remember important dates for your friends and family. It imports contacts and Facebook friends, then notifies you via badge icon or local notifications when a birthday is approaching. You can also send quick wishes directly from the app.

**Highlights:** Birthday reminders, Import from Contacts, Import from Facebook, Local notifications, Badge icon alerts, Send quick wishes

**Features:** macOS Compatibility

**In-app purchases:** none


### Ducker Detective

[App page](https://appshunter.io/ios/app/ducker-detective/id1555299893)

Easily calculate anyone's age using their birth month and day. This tool can help you verify ages, play harmless pranks, or even predict baby birth dates based on due dates.

**Highlights:** Calculate age from birth month and day, Verify ages, Predict baby birth dates, Play age-related jokes, Age verification tool

**Features:** Apple Wallet, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GIF subscription monthly | $0.99 | per month |
| Sticker subscription monthly | $0.99 | per month |
| StickerGIF subscription montly | $0.99 | per month |
| GIF subscription six month | $4.99 | per 6 months |
| Sticker subscription six month | $4.99 | per 6 months |
| StickerGIF Six-Month Plan | $4.99 | per 6 months |
| Ad-Free Subscription Yearly | $9.99 | per year |
| GIF subscription yearly | $9.99 | per year |
| Sticker subscription yearly | $9.99 | per year |
| StickerGIF subscription yearly | $9.99 | per year |


## Frequently asked questions

### Is When free?

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

### Is Ducker Detective free?

Ducker Detective is free to download, with in-app purchases available.

### Which has better reviews, When or Ducker Detective?

When is rated higher. When averages 5.0 out of 5 from 1 ratings, while Ducker Detective averages 4.8 from 24 ratings.

### Do When or Ducker Detective have ads?

Neither When nor Ducker Detective shows ads.

### Which is updated more often, When or Ducker Detective?

When ships an update every 2 months, and Ducker Detective every 2 months. Most recently, When was updated on November 1, 2026 and Ducker Detective on November 7, 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.*