# TT Mail vs DualKeyIM

The clearest difference is in-app purchases: DualKeyIM at none against TT Mail's 3. DualKeyIM also leads on update cadence (every 5 days vs every 3 months). TT Mail's advantage is iOS requirement (13.4 vs 15.0). 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. DualKeyIM asks for nothing beyond the download.

TT Mail ships an update every 3 months, DualKeyIM every 5 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | TT Mail | DualKeyIM |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Size | 20 MB | 148 MB |
| Requires iOS | **13.4** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Guangdong Yuetan Technology Co., Ltd](https://appshunter.io/developer/1763191669) | [杰 任](https://appshunter.io/developer/6797053031) |

## What reviewers say

### 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 |


### DualKeyIM

[App page](https://appshunter.io/ios/app/dualkeyim/id6797372095)

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

**In-app purchases:** none


## Frequently asked questions

### Is TT Mail free?

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

### Is DualKeyIM free?

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

### Do TT Mail or DualKeyIM have ads?

Neither TT Mail nor DualKeyIM shows ads.

### Which is updated more often, TT Mail or DualKeyIM?

TT Mail ships an update every 3 months, and DualKeyIM every 5 days. Most recently, TT Mail was updated on October 25, 2026 and DualKeyIM on October 25, 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.*