# IO ∙ Converter & Calculator vs My Inventory Stack

The clearest difference is price: My Inventory Stack at Free against IO ∙ Converter & Calculator's $0.99. My Inventory Stack also leads on update cadence (every 10 days vs every 5 months). IO ∙ Converter & Calculator's advantage is rating (4.0 vs 1.0) and in-app purchases (none vs 3). On review sentiment, ratings volume and ads there is nothing between them.

My Inventory Stack is free to download; IO ∙ Converter & Calculator costs $0.99 up front. My Inventory Stack sells 3 one-off in-app purchases. IO ∙ Converter & Calculator asks for nothing beyond the download.

IO ∙ Converter & Calculator holds the better App Store score, 4.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 33% and 33% positive.

IO ∙ Converter & Calculator ships an update every 5 months, My Inventory Stack every 10 days. The most recent releases landed on October 30, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | IO ∙ Converter & Calculator | My Inventory Stack |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/io-converter-and-calculator/id1668857713/reviews)** | [1.0 (2 ratings)](https://appshunter.io/ios/app/my-inventory-stack/id6755137430/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 33.3% of reviews | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 10 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 11 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Alex Codrington](https://appshunter.io/developer/358228521) | [Bryan Jeffrey Martin](https://appshunter.io/developer/1847187783) |

## What reviewers say

### IO ∙ Converter & Calculator

[App page](https://appshunter.io/ios/app/io-converter-and-calculator/id1668857713)

This utility app offers a comprehensive solution for unit and currency conversions, featuring live currency updates and a built-in calculator. It supports a wide range of units across multiple categories and is available on various Apple platforms.

**Highlights:** 13 conversion categories, Over 120 units supported, Live currency exchange rates, Integrated calculator, Cross-platform availability (Apple devices)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


### My Inventory Stack

[App page](https://appshunter.io/ios/app/my-inventory-stack/id6755137430)

Manage your business or collection with this intuitive inventory companion. Track items, quantities, sales, and suppliers. Organize your stock with custom categories and receive reminders for re-ordering.

**Highlights:** Intuitive item addition with photos, SKU/UPC, and costs, Barcode scanning via camera, Smart dashboard with low stock alerts and reminders, Customizable categories and sub-categories, Supplier and purchase order management, Multi-store management, Sales and purchase history tracking

**Features:** Family Sharing, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Business (Upgrade from Pro) | $9.99 | one-time |
| Pro | $39.99 | one-time |
| Business | $49.99 | one-time |


## Frequently asked questions

### Is IO ∙ Converter & Calculator free?

IO ∙ Converter & Calculator costs $0.99, with no in-app purchases.

### Is My Inventory Stack free?

My Inventory Stack is free to download, with in-app purchases available.

### Which has better reviews, IO ∙ Converter & Calculator or My Inventory Stack?

IO ∙ Converter & Calculator is rated higher. IO ∙ Converter & Calculator averages 4.0 out of 5 from 1 ratings, while My Inventory Stack averages 1.0 from 2 ratings.

### Do IO ∙ Converter & Calculator or My Inventory Stack have ads?

Neither IO ∙ Converter & Calculator nor My Inventory Stack shows ads.

### Which is updated more often, IO ∙ Converter & Calculator or My Inventory Stack?

IO ∙ Converter & Calculator ships an update every 5 months, and My Inventory Stack every 10 days. Most recently, IO ∙ Converter & Calculator was updated on October 30, 2026 and My Inventory Stack on October 26, 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.*