# ProblemSum vs Pin it

The clearest difference is price: Pin it at Free against ProblemSum's $2.99. Pin it also leads on iOS requirement (15.1 vs 18.0). ProblemSum's advantage is update cadence (every 5 weeks vs every 3 months). On ads, in-app purchases and device support there is nothing between them.

Pin it is free to download; ProblemSum costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ProblemSum ships an update every 5 weeks, Pin it every 3 months. The most recent releases landed on October 3, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | ProblemSum | Pin it |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/problemsum/id1273718042/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Monetization | Paid | — |
| Size | 2 MB | 85 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [Aeterna Solutions](https://appshunter.io/developer/1273718041) | [Haoshu Wang](https://appshunter.io/developer/1606613348) |

## What reviewers say

### ProblemSum

[App page](https://appshunter.io/ios/app/problemsum/id1273718042)

Practice math word problems aligned with the Singapore Mathematics syllabus for Primary 6 students. Get detailed solutions for each problem. The app works offline and requires no account.

**Highlights:** Random math word problem generation, Singapore Math syllabus alignment, Detailed step-by-step solutions, Offline functionality, No account required, Ad-free experience

**Features:** Vision Pro support

**In-app purchases:** none


### Pin it

[App page](https://appshunter.io/ios/app/pin-it-learn-chinese/id1606613346)

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

**In-app purchases:** none


## Frequently asked questions

### Is ProblemSum free?

ProblemSum costs $2.99, with no in-app purchases.

### Is Pin it free?

Pin it is free to download, with no in-app purchases.

### Do ProblemSum or Pin it have ads?

Neither ProblemSum nor Pin it shows ads.

### Which is updated more often, ProblemSum or Pin it?

ProblemSum ships an update every 5 weeks, and Pin it every 3 months. Most recently, ProblemSum was updated on October 3, 2026 and Pin it on September 21, 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.*