# Field Audit vs Engineering Calculator

The clearest difference is price: Field Audit at Free against Engineering Calculator's $0.99. Engineering Calculator's advantage is in-app purchases (none vs 2) and update cadence (every 2 days vs every 9 days). On ads, device support and iOS requirement there is nothing between them.

Field Audit is free to download; Engineering Calculator costs $0.99 up front. Field Audit sells 2 in-app purchases, starting at $0.99 per month. Engineering Calculator asks for nothing beyond the download.

Field Audit ships an update every 9 days, Engineering Calculator every 2 days. The most recent releases landed on September 15, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Field Audit | Engineering Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 2 days** |
| Best chart rank | — | **#197** |
| Size | 37 MB | 21 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Alptekin Atay](https://appshunter.io/developer/1883327867) | [Yasin Demir](https://appshunter.io/developer/1838444361) |

## What reviewers say

### Field Audit

[App page](https://appshunter.io/ios/app/field-audit/id6760220465)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $0.99 | per month |
| Premium Yearly | $9.99 | per year |


### Engineering Calculator

[App page](https://appshunter.io/ios/app/engineering-calculator/id6761010498)

**Currently charting:** #197 Top Paid · Productivity (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is Field Audit free?

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

### Is Engineering Calculator free?

Engineering Calculator costs $0.99, with no in-app purchases.

### Do Field Audit or Engineering Calculator have ads?

Neither Field Audit nor Engineering Calculator shows ads.

### Which is updated more often, Field Audit or Engineering Calculator?

Field Audit ships an update every 9 days, and Engineering Calculator every 2 days. Most recently, Field Audit was updated on September 15, 2026 and Engineering Calculator on September 16, 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.*