Comparison

iSum vs Big Mac Index App

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

Head to head
About

iSum

Easily track expenses, time, and various other metrics with a beautifully redesigned, user-friendly interface. Gain insights into your data with totals, averages, and trends, and export your information conveniently.

Highlights
  • Simplified and intuitive interface
  • Versatile tracking of expenses, time, and metrics
  • Customizable group organization
  • In-depth data insights and trend overviews
  • CSV data export functionality
  • Support for tracking negative numbers
Features
Read full description

Embrace the simplicity of tracking numbers, expenses, time, and so much more with iSum, all from the convenience of your iPhone. Our latest update brings you an even more polished and user-friendly interface, making iSum not just a tool, but a delight to use. What's New? Experience our beautifully redesigned UI, crafted to near perfection for the most intuitive and seamless tracking experience on your phone. Why iSum? Simplified Design: An intuitive, user-friendly interface for effortless data management. Versatile Tracking: Effortlessly manage everything from daily expenses to health metrics. Smart Organization: Customize groups for your tracking needs with ease. In-Depth Insights: Access total sums, monthly averages, and trend overviews. Export with Ease: Conveniently export data as a CSV file, whenever needed. Track Balances: Now including negative numbers for comprehensive financial management. Secure & Accessible: Your data, safeguarded with top-notch security and accessible whenever you need it. Download iSum today and experience the pinnacle of easy and efficient data management on your iPhone! #iSum #TrackingSimplified Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Big Mac Index App

Features
Read full description

The Big Mac Index App intends to show whether currencies are at their "correct" value. It was invented by The Economist in 1986. For example, the average price of a Big Mac (Burger) in USA as in July 2014 was $4.80, in China it was only $2.73 (¥16.90) at market exchange rates. So The Big Mac Index says that the Yuan was UNDERVALUED by $43.1% at that time. How To Use It 1. Input the Local Price of the Big Mac Burger. 2. Press the "CALCULATE" button. 3. You will get if the currency of the selected country is Undervalued or Overvalued and which should be the exchange rate (USD Based) for that Burger price. 4. Share the results in Facebook & Twitter. Credits Developed By Pablo Paciello - @PPacie Designed By Rafaela Sinopoli - @Rafs84 HTPressableButton By He Rin Kim - @Herinkc FlatUIKit By @Grouper HTPressableButton & FlatUIKit are Licensed under the terms of the MIT license.

Screenshots

iSum4 screens
Big Mac Index App3 screens

Verdict

The call

The clearest difference is price: iSum at Free against Big Mac Index App's $0.99. iSum also leads on update cadence (fortnightly vs every 34 months). Big Mac Index App's advantage is in-app purchases (none vs 1) and iOS requirement (9.0 vs 15.0). On ads and device support 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

iSum is free to download; Big Mac Index App costs $0.99 up front. iSum sells 1 in-app purchase, starting at $2.99 per year. Big Mac Index App asks for nothing beyond the download.

UpkeepUpdate frequency

iSum ships an update fortnightly, Big Mac Index App every 34 months. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

Scorecard4 real differences · 6 level
iSum versus Big Mac Index App: the parameters behind the verdict, then further details
ParameteriSumBig Mac Index App
PriceFree — better$0.99
Rating4.1 (24 ratings) — better—
Positive reviews82.7% of reviews—
Number of ratings24 — better—
Update frequencyFortnightly — betterEvery 34 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.09.0 — better
Further details — not scored
Size1 MB2 MB
Age rating4+4+
DeveloperZEN PLUS LTDPablo Paciello

Bugs and requests

iSum

Reported bugs

3 issues
  • Notes or descriptions disappearing after edits
  • Incompatibility issues with newer iOS versions
  • Incorrect date/time recording for entries

Requested features

5 requests
  • Add more category options
  • Implement iCloud or cloud sync support
  • Include a daily/weekly/monthly expense summary
  • Allow customization of currency and date formats
  • Provide a password protection or lock screen feature

Big Mac Index App

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

iSum

Subscriptions1
  • iSum Annual Subscription$2.991 Year
None

Big Mac Index App

No in-app purchases

Questions

Is iSum free?
iSum is free to download, with in-app purchases available.
Is Big Mac Index App free?
Big Mac Index App costs $0.99, with no in-app purchases.
Do iSum or Big Mac Index App have ads?
Neither iSum nor Big Mac Index App shows ads.
Which is updated more often, iSum or Big Mac Index App?
iSum ships an update fortnightly, and Big Mac Index App every 34 months. Most recently, iSum was updated on November 1, 2026 and Big Mac Index App on October 29, 2026.

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