# PAcalculate vs iPDF

The clearest difference is in-app purchases: PAcalculate at none against iPDF's 2. PAcalculate also leads on device support (3 vs 1) and iOS requirement (13.0 vs 18.0). iPDF's advantage is update cadence (every 3 weeks vs every 4 months). On price and ads there is nothing between them.

Both are free to download. iPDF sells 2 in-app purchases, starting at $2.99 per 7 days. PAcalculate asks for nothing beyond the download.

PAcalculate ships an update every 4 months, iPDF every 3 weeks. The most recent releases landed on October 17, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | PAcalculate | iPDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/pacalculate/id793460437/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 3 MB | 6 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jose Brusi](https://appshunter.io/developer/793460440) | [Artem Teluschenko](https://appshunter.io/developer/1896600851) |

## What reviewers say

### PAcalculate

[App page](https://appshunter.io/ios/app/pacalculate/id793460437)

This app provides 28 calculators and reference information for professional audio sound reinforcement and lighting. It covers acoustics, audio electronics, cabling, and lighting calculations, making it a valuable tool for audio and lighting professionals.

**Highlights:** 28 calculators for pro-audio and lighting, Acoustics calculations (SPL, air absorption), Audio electronics calculations (dBu/dBV, Q/B/W), Cabling calculations (speaker cable loss), Lighting calculations (DMX, RGB/CMY), Reference info (pinouts, graphs)

**Features:** macOS Compatibility

**In-app purchases:** none


### iPDF

[App page](https://appshunter.io/ios/app/ipdf-quick-pdf-compressor/id6799065935)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iPDF Premium - Weekly (3 Days Free) | $2.99 | per 7 days |
| iPDF Premium - Yearly | $24.99 | per year |


## Frequently asked questions

### Is PAcalculate free?

PAcalculate is free to download, with no in-app purchases.

### Is iPDF free?

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

### Do PAcalculate or iPDF have ads?

Neither PAcalculate nor iPDF shows ads.

### Which is updated more often, PAcalculate or iPDF?

PAcalculate ships an update every 4 months, and iPDF every 3 weeks. Most recently, PAcalculate was updated on October 17, 2026 and iPDF on October 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*