# ZattaMemo vs NULL Memo

The clearest difference is update cadence: NULL Memo at daily against ZattaMemo's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. ZattaMemo sells 1 one-off in-app purchase and NULL Memo sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ZattaMemo ships an update every 3 weeks, NULL Memo daily. The most recent releases landed on October 13, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | ZattaMemo | NULL Memo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Size | 3 MB | 60 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tatsuyoshi Sasaki](https://appshunter.io/developer/1888368184) | [Aaron Chan](https://appshunter.io/developer/1888707957) |

## What reviewers say

### ZattaMemo

[App page](https://appshunter.io/ios/app/zattamemo/id6761243555)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZattaMemo Upgrade | $3.99 | one-time |


### 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 |


## Frequently asked questions

### Is ZattaMemo free?

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

### Is NULL Memo free?

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

### Do ZattaMemo or NULL Memo have ads?

Neither ZattaMemo nor NULL Memo shows ads.

### Which is updated more often, ZattaMemo or NULL Memo?

ZattaMemo ships an update every 3 weeks, and NULL Memo daily. Most recently, ZattaMemo was updated on October 13, 2026 and NULL Memo on October 28, 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.*