# NULL Memo vs ロック付チャットメモ帳

The clearest difference is in-app purchases: ロック付チャットメモ帳 at none against NULL Memo's 1. NULL Memo's advantage is update cadence (daily vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. NULL Memo sells 1 one-off in-app purchase. ロック付チャットメモ帳 asks for nothing beyond the download.

NULL Memo ships an update daily, ロック付チャットメモ帳 monthly. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | NULL Memo | ロック付チャットメモ帳 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Monthly |
| Size | 60 MB | 10 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Aaron Chan](https://appshunter.io/developer/1888707957) | [TOMOYUKI NISHIO](https://appshunter.io/developer/6797396165) |

## What reviewers say

### NULL Memo

[App page](https://appshunter.io/ios/app/null-memo-ideas-notes-lists/id6761292505)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NULL Memo Pro | $2.99 | one-time |


### ロック付チャットメモ帳

[App page](https://appshunter.io/ios/app/id6797396163)

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

**In-app purchases:** none


## Frequently asked questions

### Is NULL Memo free?

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

### Is ロック付チャットメモ帳 free?

ロック付チャットメモ帳 is free to download, with no in-app purchases.

### Do NULL Memo or ロック付チャットメモ帳 have ads?

Neither NULL Memo nor ロック付チャットメモ帳 shows ads.

### Which is updated more often, NULL Memo or ロック付チャットメモ帳?

NULL Memo ships an update daily, and ロック付チャットメモ帳 monthly. Most recently, NULL Memo was updated on October 28, 2026 and ロック付チャットメモ帳 on October 31, 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.*