IO ∙ Converter & Calculator vs My Inventory Stack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IO ∙ Converter & Calculator
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.
- 13 conversion categories
- Over 120 units supported
- Live currency exchange rates
- Integrated calculator
- Cross-platform availability (Apple devices)
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IO (Input/Output) is a powerful and simple multiplatform unit and currency converter. Features: ∙ 13 essential categories ∙ Over 120 different units ∙ Live currency updates ∙ Calculator functionality (on iPhone and iPad) ∙ Available on iPhone, iPad, Apple Watch and Mac ∙ No Ads
My Inventory Stack
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.
- 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
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Stop guessing. Start managing. My Inventory Stack is the simple, powerful inventory companion designed for your small business, hobby, or collection. Track your inventory, manage sales, and understand your business -- all from your devices. My Inventory Stack helps you take control of your inventory with a clean interface and powerful features. -------------------- KEY FEATURES: - Intuitive Inventory: Add items in seconds. Track quantity, multiple photos, SKU/UPC, costs, and sale prices for your entire catalog. - Barcode Scanning: Use your camera to instantly scan barcodes to find items, add new stock, or add codes to existing items in your app's inventory. - Smart Dashboard: Your command centre. "Needs Attention" shows you low stock items, upcoming reminders, and open purchase orders all in one place. - Powerful Organization: Create categories and nested sub-categories to organize your inventory exactly how you want, complete with custom colours and icons. - Manage Suppliers & Purchase Orders: Keep track of your suppliers and attach purchase orders to ease adding new stock to your inventory. - Multiple Stores: Create multiple Stores to manage different locations, or simply categorize items and categories onto different stores. - Track History: See a full sales and purchase history (cost history) for every item to understand its performance over time. - Custom Reminders: Set reminders with priorities for re-ordering, follow-ups, or any other task. ------------------- UPGRADE YOUR BUSINESS (ONE TIME FEE & NO SUBSCRIPTIONS!) My Inventory Stack is free to get started. When you're ready to grow, unlock powerful features with a ONE-TIME PURCHASE. Pay once, own it forever. Unlock PRO (One-Time Purchase): - Perfect for serious hobbyists and growing single stores. - UNLIMITED: Add unlimited items, categories, and reminders. - SALES INSIGHTS: Understand your business with charts for revenue and profit. See your best and worst-selling items. - LOW STOCK ALERTS: Get notified on the dashboard when your items run low based on thresholds you set. - DATA EXPORT: Back up your items, sales, and reminders to a CSV file. Unlock BUSINESS (One-Time Purchase): - The ultimate toolkit for small businesses. - INCLUDES ALL PRO FEATURES - MULTI-STORE MANAGEMENT: Manage inventory across multiple stores or locations from one app. - SALES TRACKING: Log sales to automatically deplete stock and power your insights. - SUPPLIER MANAGEMENT: Keep a complete directory of your suppliers. - PURCHASE ORDER SYSTEM: Create, track, and receive Purchase Orders (POs) from your suppliers to automatically update your stock levels and cost history. Whether you're managing a small shop, tracking collectibles, or running a pop-up, My Inventory Stack brings clarity to your inventory. Download today and take control of your stock.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 12, 2026 and October 26, 2026 respectively.
| Parameter | IO ∙ Converter & Calculator | My Inventory Stack |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.0 (1 ratings) — better | 1.0 (2 ratings) |
| Positive reviews | 33.3% of reviews | 33.3% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 5 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod, Mac, Apple Watch — better | iPhone, iPad, Mac |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 1 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Alex Codrington | Bryan Jeffrey Martin |
Customer experience
IO ∙ Converter & Calculator
My Inventory Stack
In-app purchases
IO ∙ Converter & Calculator
No in-app purchases
My Inventory Stack
- Business (Upgrade from Pro)$9.99
- Pro$39.99
- Business$49.99
Questions
Is IO ∙ Converter & Calculator free?
Is My Inventory Stack free?
Which has better reviews, IO ∙ Converter & Calculator or My Inventory Stack?
Do IO ∙ Converter & Calculator or My Inventory Stack have ads?
Which is updated more often, IO ∙ Converter & Calculator or My Inventory Stack?
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