# C6协同v3.9 vs TT Mail

The clearest difference is in-app purchases: C6协同v3.9 at none against TT Mail's 3. C6协同v3.9 also leads on update cadence (every 3 weeks vs every 3 months) and iOS requirement (7.0 vs 13.4). On price, ads and device support there is nothing between them.

Both are free to download. TT Mail sells 3 in-app purchases, starting at $1.99 per month. C6协同v3.9 asks for nothing beyond the download.

C6协同v3.9 ships an update every 3 weeks, TT Mail every 3 months. The most recent releases landed on October 4, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | C6协同v3.9 | TT Mail |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 21 MB | 20 MB |
| Requires iOS | **7.0** | 13.4 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BEIJING JINHER SOFTWARE CO.LTD.](https://appshunter.io/developer/473901494) | [Guangdong Yuetan Technology Co., Ltd](https://appshunter.io/developer/1763191669) |

## What reviewers say

### C6协同v3.9

[App page](https://appshunter.io/ios/app/c6v39/id1173412813)

**Features:** macOS Compatibility

**In-app purchases:** none


### TT Mail

[App page](https://appshunter.io/ios/app/tt-mail/id6740429154)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $1.99 | per month |
| Seasonal subscription | $3.99 | per 3 months |
| Annual subscription | $9.99 | per year |


## Frequently asked questions

### Is C6协同v3.9 free?

C6协同v3.9 is free to download, with no in-app purchases.

### Is TT Mail free?

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

### Do C6协同v3.9 or TT Mail have ads?

Neither C6协同v3.9 nor TT Mail shows ads.

### Which is updated more often, C6协同v3.9 or TT Mail?

C6协同v3.9 ships an update every 3 weeks, and TT Mail every 3 months. Most recently, C6协同v3.9 was updated on October 4, 2026 and TT Mail on October 5, 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.*