# One &. vs ペットメモ

The clearest difference is in-app purchases: ペットメモ at none against One &.'s 4. One &.'s advantage is update cadence (every 4 days vs every 2 months) and iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. One &. sells 4 in-app purchases, starting at $0.99 per month. ペットメモ asks for nothing beyond the download.

One &. ships an update every 4 days, ペットメモ every 2 months. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | One &. | ペットメモ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 4 days** | Every 2 months |
| Size | 49 MB | 8 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [KIYOKAZU KUROSAWA](https://appshunter.io/developer/1813710302) | [Kota Sakurai](https://appshunter.io/developer/1802450521) |

## What reviewers say

### One &.

[App page](https://appshunter.io/ios/app/one-and/id6745878713)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-Free Plan Monthly | $0.99 | per month |
| One&. Plus Monthly | $1.99 | per month |
| Ad-Free Plan Yearly | $9.99 | per year |
| One&. Plus Yearly | $19.99 | per year |


### ペットメモ

[App page](https://appshunter.io/ios/app/and/id6784509228)

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

**In-app purchases:** none


## Frequently asked questions

### Is One &. free?

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

### Is ペットメモ free?

ペットメモ is free to download, with no in-app purchases.

### Do One &. or ペットメモ have ads?

Both One &. and ペットメモ show ads.

### Which is updated more often, One &. or ペットメモ?

One &. ships an update every 4 days, and ペットメモ every 2 months. Most recently, One &. was updated on October 7, 2026 and ペットメモ on October 6, 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.*