# Ducker Detective vs OnlyWeekNo.

The clearest difference is ads: Ducker Detective at none against OnlyWeekNo.'s shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Ducker Detective sells 11 in-app purchases, starting at $0.99 per month and OnlyWeekNo. sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on August 18, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Ducker Detective | OnlyWeekNo. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (24 ratings)](https://appshunter.io/ios/app/ducker-detective/id1555299893/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 100 MB | 4 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ducker Detective, LLC](https://appshunter.io/developer/1555299895) | [Takenori Kabeya](https://appshunter.io/developer/289913597) |

## What reviewers say

### 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 (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-Free Subscription Monthly | $0.99 | per month |
| 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 |


### OnlyWeekNo.

[App page](https://appshunter.io/ios/app/onlyweekno/id6448488587)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Disable Advertising | $0.49 | one-time |


## Frequently asked questions

### Is Ducker Detective free?

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

### Is OnlyWeekNo. free?

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

### Do Ducker Detective or OnlyWeekNo. have ads?

OnlyWeekNo. shows ads; Ducker Detective does not.

### Which is updated more often, Ducker Detective or OnlyWeekNo.?

Ducker Detective ships an update every 2 months, and OnlyWeekNo. every 2 months. Most recently, Ducker Detective was updated on August 18, 2026 and OnlyWeekNo. on September 17, 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.*