# PAcalculate vs On

The clearest difference is in-app purchases: PAcalculate at none against On's 2. PAcalculate also leads on iOS requirement (13.0 vs 17). On's advantage is update cadence (every 3 weeks vs every 4 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. On sells 2 one-off in-app purchases. PAcalculate asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for PAcalculate against 5.0 for On. Both are backed by a comparable volume of ratings — 7 and 6 respectively.

PAcalculate ships an update every 4 months, On every 3 weeks. The most recent releases landed on June 8, 2026 and July 8, 2026 respectively.

## The numbers

| Metric | PAcalculate | On |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (7 ratings)](https://appshunter.io/ios/app/pacalculate/id793460437/reviews) | [5.0 (6 ratings)](https://appshunter.io/ios/app/on-axis/id6446842774/reviews) |
| Number of ratings | **7** | 6 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 20 MB |
| Requires iOS | **13.0** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jose Brusi](https://appshunter.io/developer/793460440) | [OK-Sound](https://appshunter.io/developer/1679335942) |

## 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


### On

[App page](https://appshunter.io/ios/app/on-axis/id6446842774)

This utility app helps audio professionals quickly measure and model audience areas for event and touring setups. It offers a streamlined workflow compatible with popular loudspeaker simulation programs, speeding up the design process. Users can create 3D models of listening areas and generate profiles along speaker axes.

**Highlights:** Audience area measurement, 3D listening area modeling, Speaker axis profiling, Bluetooth laser distance finder integration, Export to loudspeaker simulation software, 14-day free trial

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 14-day Trial | Free | one-time |
| Unlock App | $149.99 | one-time |


## Frequently asked questions

### Is PAcalculate free?

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

### Is On free?

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

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

PAcalculate and On are both rated 5.0 out of 5 on the App Store, from 7 and 6 ratings respectively.

### Do PAcalculate or On have ads?

Neither PAcalculate nor On shows ads.

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

PAcalculate ships an update every 4 months, and On every 3 weeks. Most recently, PAcalculate was updated on June 8, 2026 and On on July 8, 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.*