# Convert PDF vs Concrete Calculator

The clearest difference is update cadence: Convert PDF at every 6 days against Concrete Calculator's every 3 months. Concrete Calculator's advantage is iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Convert PDF sells 2 in-app purchases, starting at $2.99 per 7 days and Concrete Calculator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Convert PDF ships an update every 6 days, Concrete Calculator every 3 months. Both last shipped on October 30, 2026.

## The numbers

| Metric | Convert PDF | Concrete Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 3 months |
| Size | 4 MB | 39 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [LEAP STUDIO](https://appshunter.io/developer/1472946428) | [Shital Gorasiya](https://appshunter.io/developer/1737199158) |

## What reviewers say

### Convert PDF

[App page](https://appshunter.io/ios/app/convert-pdf/id6749571004)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3-Day Trial | $2.99 | per 7 days |
| Yearly Plan | $19.99 | per year |


### Concrete Calculator

[App page](https://appshunter.io/ios/app/concrete-calculator-solidmix/id6751228843)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Purchase | $4.99 | one-time |


## Frequently asked questions

### Is Convert PDF free?

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

### Is Concrete Calculator free?

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

### Do Convert PDF or Concrete Calculator have ads?

Neither Convert PDF nor Concrete Calculator shows ads.

### Which is updated more often, Convert PDF or Concrete Calculator?

Convert PDF ships an update every 6 days, and Concrete Calculator every 3 months. Most recently, Convert PDF was updated on October 30, 2026 and Concrete Calculator on October 30, 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.*