Comparison

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.

Head to head
About

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.

Highlights
  • 13 conversion categories
  • Over 120 units supported
  • Live currency exchange rates
  • Integrated calculator
  • Cross-platform availability (Apple devices)
Features
Read full description

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

About

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.

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
Read full description

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

IO ∙ Converter & Calculator4 screens
My Inventory Stack4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
IO ∙ Converter & Calculator versus My Inventory Stack: the parameters behind the verdict, then further details
ParameterIO ∙ Converter & CalculatorMy Inventory Stack
Price$0.99Free — better
Rating4.0 (1 ratings) — better1.0 (2 ratings)
Positive reviews33.3% of reviews33.3% of reviews
Number of ratings12 — better
Update frequencyEvery 5 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod, Mac, Apple Watch — betteriPhone, iPad, Mac
Requires iOS15.0 — better18.0
Further details — not scored
Size1 MB11 MB
Age rating4+4+
DeveloperAlex CodringtonBryan Jeffrey Martin

Customer experience

IO ∙ Converter & Calculator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive33.3%
Neutral66.7%
Negative0.0%

My Inventory Stack

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

In-app purchases

None

IO ∙ Converter & Calculator

No in-app purchases

3 purchases

My Inventory Stack

One-time3
  • Business (Upgrade from Pro)$9.99
  • Pro$39.99
  • Business$49.99

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 12, 2026 and My Inventory Stack on October 26, 2026.

Other comparisons