# 萤火写作 vs C.md

The clearest difference is in-app purchases: 萤火写作 at none against C.md's 1. 萤火写作 also leads on update cadence (every 2 days vs every 4 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. C.md sells 1 one-off in-app purchase. 萤火写作 asks for nothing beyond the download.

萤火写作 ships an update every 2 days, C.md every 4 days. The most recent releases landed on October 10, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | 萤火写作 | C.md |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 4 days |
| Size | 6 MB | 173 MB |
| Requires iOS | 18.0 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [松明 张](https://appshunter.io/developer/1064830289) | [建东 高](https://appshunter.io/developer/1597492102) |

## What reviewers say

### 萤火写作

[App page](https://appshunter.io/ios/app/id6766533941)

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

**In-app purchases:** none


### C.md

[App page](https://appshunter.io/ios/app/cmd-markdown-reader/id6810085356)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| C.md Pro | $9.99 | one-time |


## Frequently asked questions

### Is 萤火写作 free?

萤火写作 is free to download, with no in-app purchases.

### Is C.md free?

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

### Do 萤火写作 or C.md have ads?

Neither 萤火写作 nor C.md shows ads.

### Which is updated more often, 萤火写作 or C.md?

萤火写作 ships an update every 2 days, and C.md every 4 days. Most recently, 萤火写作 was updated on October 10, 2026 and C.md on October 8, 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.*