Comparison

IOU vs Stack

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

IOU

Effortlessly manage your finances with this comprehensive budgeting and expense tracking app. Monitor spending, track debts and credits, and gain insights into your financial health with detailed reports and customizable features.

Highlights
  • Comprehensive expense tracking
  • Debt and credit management
  • Multiple currency support
  • Income and expense reports
  • Automatic report generation
  • Customizable manual updates
  • Loan tracking between friends/family
Features
Read full description

IOU Money - Budget App | Expense Tracker & Finance Manager Manage your finances effortlessly with IOU Money, the ultimate budgeting app designed to help you track, manage, and optimize your spending. Whether you're organizing your expenses, managing your debts, or planning your budget, IOU Money makes it simple to stay on top of your financial goals in real-time. With IOU Money, you can: Track spending easily and get automatic reports for full expense management. Keep a detailed record of your income and expenses for better financial control. Monitor your debts and credits with a smart debt tracker. View beautiful graphs and detailed financial reports that help you optimize your budget. Get notifications for any updates to your transactions and manage your loans (borrowed or lent) seamlessly. Key Features: Comprehensive Expense Tracking: Record and review your daily, monthly, and yearly spending. Debt and Credit Management: Keep track of loans and repayments easily. Multiple Currency Support: Manage your finances in various currencies like USD, NPR, EUR, JPY, GBP, and more. Income & Expense Reports: See where your money goes with detailed financial breakdowns. Automatic Report Generation: Get detailed, easy-to-understand reports without lifting a finger. Customizable Manual Updates: Import transactions from your bank or spreadsheet for seamless expense tracking. Available Currencies: USD, NPR, AUD, EUR, JPY, GBP, INR, KRW — More currencies will be added in future updates. Why Choose IOU Money? Take control of your finances with intuitive expense management tools. Track loans between friends and family with ease using our loan tracker. Get personalized budgeting insights to optimize spending and save money. Use a safe wallet to manage your money and keep track of all your transactions in one place. Perfect for: Personal finance management. Expense tracking and budget planning. Organizing loans and debts with friends or family. Saving money and improving your financial health. By downloading and using IOU Money, you agree to the Apple Standard End User License Agreement and our Privacy Policy. Access Terms of Use and Privacy Policy Terms of Use and Privacy Policy are available directly within the app, accessible via the Settings page and Paywall screen. By downloading and using IOU Money, you agree to the Apple Standard End User License Agreement and our Privacy Policy. Apple Standard End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Stack

Easily track and manage personal finances by categorizing credit and debt across multiple devices. Create separate spaces for different financial situations, share summaries, and use the built-in calculator for complex calculations.

Highlights
  • Categorize credit and debt
  • Create multiple financial spaces
  • Share debt summaries
  • Integrated value calculator
  • Split expenses easily
  • App lock with Face ID/Touch ID
  • Apple Watch app for on-the-go management
Features
Read full description

Stack is the fastest debt management app for iPhone, iPad, Apple Watch and Mac. It enables you to categorize money you are owed and money you owe, and conveniently track and manage your finances across multiple devices. Stack offers the following features: • Spaces: Create multiple Spaces to categorize your debt. For example, you can create a Space for each friend who owes you money. • Add Entries: Add an entry to a Space with one tap. Give each entry a name, quantity, and value. Use a positive value for money you are owed and a negative value for money you owe. Entries in Spaces can be sorted by date, value, or name. • Remove Debt: Removing debt is also straightforward. Tap on the circle on the left side of a debt entry to remove it. If you accidentally removed an entry, you can restore it later, similar to the Reminders app. • Share Debt: You can choose to share the debt of a Space, which generates a list of all debt and the total sum. You can choose if you want to include entries previously marked as complete, and you can choose to include the date of the entry. The date can also be edited. • Value Calculator: You can use the integrated calculator to perform complex calculations and then transfer them directly to the value field. • Split Sum: With this feature, sharing expenses is easy. Just choose the number of parts you want to split a Space's total into, and Stack will automatically calculate the amount of each part. • App Lock: Stack offers Face ID or Touch ID to lock the app, ensuring that only you can access it. • Apple Watch App: You can view, edit, and add new entries on your Apple Watch. No connection to your iPhone is required. • iCloud Sync: All your data is synced between your iPhone, iPad, Apple Watch and Mac. • Privacy: Your data is stored only on your device and in iCloud. The app does not collect any user data, and the developer has no access to it. • Text Field Sizes: You can adjust the name field and the value field sizes to your preference.

Screenshots

IOU4 screens
Stack4 screens

Verdict

The call

The clearest difference is review sentiment: Stack at 100% against IOU's 0%. Stack also leads on rating (4.3 vs 2.5) and ads (none vs shown). On price, update cadence, in-app purchases and iOS requirement 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

Both are free to download. IOU sells 2 in-app purchases, starting at $3.99 per month and Stack sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Stack holds the better App Store score, 4.3 against 2.5. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews point the same way: 0% of IOU's written reviews are positive against 100% of Stack's.

UpkeepUpdate frequency

IOU ships an update every 2 months, Stack every 6 weeks. Both last shipped on November 3, 2026.

Scorecard6 real differences · 4 level
IOU versus Stack: the parameters behind the verdict, then further details
ParameterIOUStack
PriceFreeFree
Rating2.5 (2 ratings)4.3 (6 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings26 — better
Update frequencyEvery 2 monthsEvery 6 weeks — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPodiPhone, iPad, Mac, Apple Watch — better
Requires iOS15.6 — better16.0
Further details — not scored
Size32 MB32 MB
Age rating4+4+
DeveloperNikesh ShakyaLeon Boettger

Customer experience

IOU

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Stack

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

IOU

Subscriptions2
  • Monthly$3.991 Month
  • Yearly1 Year trial$19.991 Year
1 purchases

Stack

One-time1
  • Stack+$0.99

Questions

Is IOU free?
IOU is free to download, with in-app purchases available.
Is Stack free?
Stack is free to download, with in-app purchases available.
Which has better reviews, IOU or Stack?
Stack is rated higher. IOU averages 2.5 out of 5 from 2 ratings, while Stack averages 4.3 from 6 ratings.
Do IOU or Stack have ads?
IOU shows ads; Stack does not.
Which is updated more often, IOU or Stack?
IOU ships an update every 2 months, and Stack every 6 weeks. Most recently, IOU was updated on November 3, 2026 and Stack on November 3, 2026.

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