# Calculy vs Smart PDF Compressor

The clearest difference is in-app purchases: Smart PDF Compressor at none against Calculy's 3. Calculy's advantage is iOS requirement (15.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Calculy sells 3 one-off in-app purchases. Smart PDF Compressor asks for nothing beyond the download.

Calculy ships an update every 2 weeks, Smart PDF Compressor every 9 days. The most recent releases landed on September 15, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Calculy | Smart PDF Compressor |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 91.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Free | — |
| Size | 3 MB | 1 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lingo4you Mario Muller und Heike Pahlow GbR](https://appshunter.io/developer/395530887) | [Quan Dang](https://appshunter.io/developer/1868401962) |

## What reviewers say

### Calculy

[App page](https://appshunter.io/ios/app/calculy/id1605142327)

This free calculator app offers advanced functions beyond basic arithmetic, including a comprehensive unit converter with daily updated currency rates. It supports a wide range of mathematical operations and is available for iPhone and iPad.

**Highlights:** Advanced mathematical functions, Unit converter with 220+ units, Daily updated currency rates, Supports iPad expanded layout, Hardware keyboard support on iPad, Ad-free experience

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy me a coffee | $0.99 | one-time |
| Buy me cookies | $1.99 | one-time |
| Buy me a pizza | $3.99 | one-time |


### Smart PDF Compressor

[App page](https://appshunter.io/ios/app/smart-pdf-compressor-reduce/id6757997785)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calculy free?

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

### Is Smart PDF Compressor free?

Smart PDF Compressor is free to download, with no in-app purchases.

### Do Calculy or Smart PDF Compressor have ads?

Neither Calculy nor Smart PDF Compressor shows ads.

### Which is updated more often, Calculy or Smart PDF Compressor?

Calculy ships an update every 2 weeks, and Smart PDF Compressor every 9 days. Most recently, Calculy was updated on September 15, 2026 and Smart PDF Compressor on September 19, 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.*