# iSum vs Big Mac Index App

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.

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.

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.

## The numbers

| Metric | iSum | Big Mac Index App |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.1 (24 ratings)](https://appshunter.io/ios/app/isum/id435350676/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 82.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 34 months |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 2 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ZEN PLUS LTD](https://appshunter.io/developer/317808580) | [Pablo Paciello](https://appshunter.io/developer/834434174) |

## What reviewers say

### iSum

[App page](https://appshunter.io/ios/app/isum/id435350676)

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:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iSum Annual Subscription | $2.99 | per year |

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Straightforward and efficient
- 💡 Useful for tracking expenses and budgeting
- 🔒 Secure and private data storage
- ⭐ Great customer service and responsiveness

**What reviewers complain about**

- 🐛 Occasional crashes or data loss issues
- 🔒 Lack of password protection or security features
- 💰 Subscription model or paid upgrade concerns
- 📂 Limited number of categories or lists
- 🔄 Difficulty restoring previous purchases

**Reported bugs**

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

**Requested features**

- 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

[App page](https://appshunter.io/ios/app/big-mac-index-app/id908062605)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*