# PiSquared vs Sum List

The clearest difference is in-app purchases: PiSquared at none against Sum List's 1. PiSquared also leads on iOS requirement (13.0 vs 15.0). Sum List's advantage is update cadence (every 3 months vs every 23 months). On price, ads and device support there is nothing between them.

PiSquared costs $1.99 and Sum List $1.99 up front. Sum List sells 1 one-off in-app purchase. PiSquared asks for nothing beyond the download.

PiSquared ships an update every 23 months, Sum List every 3 months. The most recent releases landed on October 15, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | PiSquared | Sum List |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 3 months** |
| Size | 3 MB | 1 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hartwig Wiesmann](https://appshunter.io/developer/1658877258) | [Erdem Met](https://appshunter.io/developer/1632731422) |

## What reviewers say

### PiSquared

[App page](https://appshunter.io/ios/app/pisquared/id1615268645)

**Features:** Apple Watch app

**In-app purchases:** none


### Sum List

[App page](https://appshunter.io/ios/app/sum-list/id1632731420)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iCloud Extension | $1.99 | one-time |


## Frequently asked questions

### Is PiSquared free?

PiSquared costs $1.99, with no in-app purchases.

### Is Sum List free?

Sum List costs $1.99, and also offers in-app purchases.

### Do PiSquared or Sum List have ads?

Neither PiSquared nor Sum List shows ads.

### Which is updated more often, PiSquared or Sum List?

PiSquared ships an update every 23 months, and Sum List every 3 months. Most recently, PiSquared was updated on October 15, 2026 and Sum List on October 14, 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.*