# MathScope vs DuoNiu Write

The clearest difference is in-app purchases: MathScope at none against DuoNiu Write's 2. DuoNiu Write's advantage is update cadence (weekly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. DuoNiu Write sells 2 one-off in-app purchases. MathScope asks for nothing beyond the download.

MathScope ships an update every 2 months, DuoNiu Write weekly. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | MathScope | DuoNiu Write |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Size | 2 MB | 131 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [光浩 李](https://appshunter.io/developer/1576352133) | [娟妹 曹](https://appshunter.io/developer/6780705701) |

## What reviewers say

### MathScope

[App page](https://appshunter.io/ios/app/mathscope-graphing-calculator/id6757952262)

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

**In-app purchases:** none


### DuoNiu Write

[App page](https://appshunter.io/ios/app/duoniu-write/id6780910815)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Poem Practice | $0.99 | one-time |
| Unlock All Poetry | $0.99 | one-time |


## Frequently asked questions

### Is MathScope free?

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

### Is DuoNiu Write free?

DuoNiu Write is free to download, with in-app purchases available.

### Do MathScope or DuoNiu Write have ads?

Neither MathScope nor DuoNiu Write shows ads.

### Which is updated more often, MathScope or DuoNiu Write?

MathScope ships an update every 2 months, and DuoNiu Write weekly. Most recently, MathScope was updated on October 25, 2026 and DuoNiu Write on October 28, 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.*