# MM私密相册 vs WriteTex

The clearest difference is update cadence: WriteTex at every 10 days against MM私密相册's every 3 weeks. MM私密相册's advantage is iOS requirement (14.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. MM私密相册 sells 3 in-app purchases, starting at $2.99 per 7 days and WriteTex sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

MM私密相册 ships an update every 3 weeks, WriteTex every 10 days. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | MM私密相册 | WriteTex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/writetex-math-ocr-and-latex/id6747911928/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | — | Freemium |
| Size | 16 MB | 14 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [旭 张](https://appshunter.io/developer/1563196763) | [星宇 黄](https://appshunter.io/developer/1823348720) |

## What reviewers say

### MM私密相册

[App page](https://appshunter.io/ios/app/mm/id6739800550)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 私密相册周会员 | $2.99 | per 7 days |
| 私密相册年会员 | $19.99 | per year |
| 私密相册终身会员 | $29.99 | one-time |


### WriteTex

[App page](https://appshunter.io/ios/app/writetex-math-ocr-and-latex/id6747911928)

Instantly convert handwritten math equations into LaTeX, Markdown, or TikZ code. This app uses advanced AI to recognize complex formulas, matrices, and diagrams, integrating seamlessly with desktop editors like VS Code and Obsidian.

**Highlights:** Handwritten math to LaTeX conversion, AI-powered OCR for complex formulas, Markdown and TikZ code output, Desktop sync for VS Code, Obsidian, Word, BYOK (Bring Your Own Key) for data control, High privacy options

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly AI Subscription | $3.99 | per month |
| Yearly AI Subscription | $39.99 | per year |
| Custom API | $1.99 | one-time |


## Frequently asked questions

### Is MM私密相册 free?

MM私密相册 is free to download, with in-app purchases available.

### Is WriteTex free?

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

### Do MM私密相册 or WriteTex have ads?

Neither MM私密相册 nor WriteTex shows ads.

### Which is updated more often, MM私密相册 or WriteTex?

MM私密相册 ships an update every 3 weeks, and WriteTex every 10 days. Most recently, MM私密相册 was updated on October 8, 2026 and WriteTex on October 24, 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.*