# Moca | 自分にメールを送るメモ帳 vs SixDo

The clearest difference is in-app purchases: Moca | 自分にメールを送るメモ帳 at none against SixDo's 1. Moca | 自分にメールを送るメモ帳 also leads on update cadence (every 4 days vs every 4 weeks) and iOS requirement (11.0 vs 16.0). SixDo's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. SixDo sells 1 one-off in-app purchase. Moca | 自分にメールを送るメモ帳 asks for nothing beyond the download.

Moca | 自分にメールを送るメモ帳 ships an update every 4 days, SixDo every 4 weeks. The most recent releases landed on November 12, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Moca | 自分にメールを送るメモ帳 | SixDo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 4 weeks |
| Size | 33 MB | 32 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hiroki Ogata](https://appshunter.io/developer/1480936548) | [mami hara](https://appshunter.io/developer/6792413290) |

## What reviewers say

### Moca | 自分にメールを送るメモ帳

[App page](https://appshunter.io/ios/app/moca/id6464327820)

**In-app purchases:** none


### SixDo

[App page](https://appshunter.io/ios/app/sixdo-ivy-lee-method-to-do/id6797027631)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SixDo Pro | $3.99 | one-time |


## Frequently asked questions

### Is Moca | 自分にメールを送るメモ帳 free?

Moca | 自分にメールを送るメモ帳 is free to download, with no in-app purchases.

### Is SixDo free?

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

### Do Moca | 自分にメールを送るメモ帳 or SixDo have ads?

Moca | 自分にメールを送るメモ帳 shows ads; SixDo does not.

### Which is updated more often, Moca | 自分にメールを送るメモ帳 or SixDo?

Moca | 自分にメールを送るメモ帳 ships an update every 4 days, and SixDo every 4 weeks. Most recently, Moca | 自分にメールを送るメモ帳 was updated on November 12, 2026 and SixDo on November 10, 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.*