# PAcalculate vs GTRS

The clearest difference is review sentiment: PAcalculate at 100% against GTRS's 38%. PAcalculate also leads on rating (5.0 vs 2.9) and iOS requirement (13.0 vs 15.6). GTRS's advantage is update cadence (every 5 weeks vs every 4 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PAcalculate holds the better App Store score, 5.0 against 2.9. Both are backed by a comparable volume of ratings — 7 and 16 respectively. Written reviews point the same way: 100% of PAcalculate's written reviews are positive against 38% of GTRS's.

PAcalculate ships an update every 4 months, GTRS every 5 weeks. The most recent releases landed on October 1, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | PAcalculate | GTRS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/pacalculate/id793460437/reviews)** | [2.9 (16 ratings)](https://appshunter.io/ios/app/gtrs/id1491879128/reviews) |
| Number of ratings | 7 | **16** |
| Positive reviews | **100.0% of reviews** | 37.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 3 MB | 219 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jose Brusi](https://appshunter.io/developer/793460440) | [mooer](https://appshunter.io/developer/1384361853) |

## 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


### GTRS

[App page](https://appshunter.io/ios/app/gtrs/id1491879128)

Control your GTRS guitar hardware with this app. It offers real-time status updates, quick switching of over 110 effect models, and the ability to load different guitar sample files for varied tones. Features include a virtual footswitch, tuner, metronome, and cloud storage for your files.

**Highlights:** Low latency Bluetooth connectivity, 110+ effect models, Load custom guitar sample files, Virtual footswitch, Built-in tuner and metronome, Cloud file upload/download

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PAcalculate free?

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

### Is GTRS free?

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

### Which has better reviews, PAcalculate or GTRS?

PAcalculate is rated higher. PAcalculate averages 5.0 out of 5 from 7 ratings, while GTRS averages 2.9 from 16 ratings.

### Do PAcalculate or GTRS have ads?

Neither PAcalculate nor GTRS shows ads.

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

PAcalculate ships an update every 4 months, and GTRS every 5 weeks. Most recently, PAcalculate was updated on October 1, 2026 and GTRS on October 18, 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.*