# PDF Conversion vs Duck Calculator

The clearest difference is price: PDF Conversion at Free against Duck Calculator's $0.99. PDF Conversion also leads on update cadence (every 3 weeks vs every 7 months). Duck Calculator's advantage is in-app purchases (none vs 4). On ads, device support and iOS requirement there is nothing between them.

PDF Conversion is free to download; Duck Calculator costs $0.99 up front. PDF Conversion sells 4 in-app purchases, starting at $2.99 per 7 days. Duck Calculator asks for nothing beyond the download.

PDF Conversion ships an update every 3 weeks, Duck Calculator every 7 months. Both last shipped on November 4, 2026.

## The numbers

| Metric | PDF Conversion | Duck Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 7 months |
| Monetization | — | Paid |
| Size | 5 MB | 1 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Litchi Fun Technology Co., Ltd.](https://appshunter.io/developer/1684888838) | [德铭 何](https://appshunter.io/developer/1690983330) |

## What reviewers say

### PDF Conversion

[App page](https://appshunter.io/ios/app/pdf-conversion-convert-to-word/id6605929812)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $2.99 | per 7 days |
| Monthly Subscription | $4.99 | per month |
| Annual Subscription | $14.99 | per year |
| Lifetime Member | $24.99 | one-time |


### Duck Calculator

[App page](https://appshunter.io/ios/app/duck-calculator/id6739608733)

This app appears as a standard calculator but has a hidden "magic" mode. It can display preset text or images when a specific number is calculated, offering creative surprises for pranks or confessions.

**Highlights:** Accurate standard calculations, Magic mode for custom results, Display preset text or pictures, Customizable magic effects, Secret and low-key design

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PDF Conversion free?

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

### Is Duck Calculator free?

Duck Calculator costs $0.99, with no in-app purchases.

### Do PDF Conversion or Duck Calculator have ads?

Neither PDF Conversion nor Duck Calculator shows ads.

### Which is updated more often, PDF Conversion or Duck Calculator?

PDF Conversion ships an update every 3 weeks, and Duck Calculator every 7 months. Most recently, PDF Conversion was updated on November 4, 2026 and Duck Calculator on November 4, 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.*