# Perfect Structure vs PDF

The clearest difference is update cadence: Perfect Structure at every 2 days against PDF's fortnightly. Perfect Structure also leads on iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Perfect Structure sells 1 one-off in-app purchase and PDF sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Perfect Structure ships an update every 2 days, PDF fortnightly. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Perfect Structure | PDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/perfect-structure/id1581860758/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Fortnightly |
| Monetization | Free with in-app purchases | — |
| Size | 32 MB | 99 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gokhan Behcet Sahin](https://appshunter.io/developer/1409805750) | [Shahmeer Tahir](https://appshunter.io/developer/1774051232) |

## What reviewers say

### Perfect Structure

[App page](https://appshunter.io/ios/app/perfect-structure/id1581860758)

Design and optimize reinforced concrete columns and beams with support for multiple international design codes and languages. Generate reports in PDF, CSV, and DXF formats, and share them with colleagues. Offers a user-friendly interface for quick and flexible structural analysis.

**Highlights:** Reinforced concrete column and beam design, Support for 5 international design codes, Multilingual support (8 languages), Output in PDF, CSV, and DXF formats, Modern and user-friendly interface, Design checks and optimal reinforcement calculation

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Perfect Structure Pro | $8.99 | one-time |


### PDF

[App page](https://appshunter.io/ios/app/pdf-x-pdf-editor-and-scanner/id6740541651)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| PDF-X Premium | $4.99 | per month |
| Premium Annual | $19.99 | per year |


## Frequently asked questions

### Is Perfect Structure free?

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

### Is PDF free?

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

### Do Perfect Structure or PDF have ads?

Both Perfect Structure and PDF show ads.

### Which is updated more often, Perfect Structure or PDF?

Perfect Structure ships an update every 2 days, and PDF fortnightly. Most recently, Perfect Structure was updated on November 3, 2026 and PDF 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.*