# Air Density Calculator vs AICounter

The clearest difference is price: AICounter at Free against Air Density Calculator's $2.99. AICounter also leads on update cadence (every 9 days vs every 20 months). Air Density Calculator's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

AICounter is free to download; Air Density Calculator costs $2.99 up front. AICounter sells 2 in-app purchases, starting at $5.99 per month. Air Density Calculator asks for nothing beyond the download.

Air Density Calculator ships an update every 20 months, AICounter every 9 days. The most recent releases landed on September 22, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Air Density Calculator | AICounter |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/air-density-calculator/id1421668162/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 20 months | **Every 9 days** |
| Monetization | Paid | — |
| Size | 1 MB | 246 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Shih-Kung Chen](https://appshunter.io/developer/871339068) |

## What reviewers say

### Air Density Calculator

[App page](https://appshunter.io/ios/app/air-density-calculator/id1421668162)

Instantly calculate air density and atmospheric properties with this offline engineering tool. Features three modes for density, reverse solving, and altitude estimation, with flexible unit support and calculation breakdown.

**Highlights:** Accurate air density calculation, Density, Reverse Solve, and Altitude modes, Flexible unit support, Show calculation steps, Tap to copy results, Calculation history, Offline functionality

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

**In-app purchases:** none


### AICounter

[App page](https://appshunter.io/ios/app/aicounter-count-objects-fast/id6753897833)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $5.99 | per month |
| Annual Premium | $49.99 | per year |


## Frequently asked questions

### Is Air Density Calculator free?

Air Density Calculator costs $2.99, with no in-app purchases.

### Is AICounter free?

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

### Do Air Density Calculator or AICounter have ads?

AICounter shows ads; Air Density Calculator does not.

### Which is updated more often, Air Density Calculator or AICounter?

Air Density Calculator ships an update every 20 months, and AICounter every 9 days. Most recently, Air Density Calculator was updated on September 22, 2026 and AICounter on September 23, 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.*