# OceanTree vs こどもずかん Kids' Encyclopedia

OceanTree and こどもずかん Kids' Encyclopedia are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. OceanTree sells 2 in-app purchases, starting at $2.49 per month and こどもずかん Kids' Encyclopedia sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

OceanTree ships an update every 2 months, こどもずかん Kids' Encyclopedia monthly. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | OceanTree | こどもずかん Kids' Encyclopedia |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Size | 75 MB | 8 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Win Hlaing Tun](https://appshunter.io/developer/518190144) | [Noriaki Togashi](https://appshunter.io/developer/1800084826) |

## What reviewers say

### OceanTree

[App page](https://appshunter.io/ios/app/oceantree/id6754528059)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $2.49 | per month |
| Yearly Subscription | $14.99 | per year |


### こどもずかん Kids' Encyclopedia

[App page](https://appshunter.io/ios/app/kids-encyclopedia/id6816336946)

**Features:** macOS Compatibility, Family Sharing, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vehicles: Full Book | $2.99 | one-time |


## Frequently asked questions

### Is OceanTree free?

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

### Is こどもずかん Kids' Encyclopedia free?

こどもずかん Kids' Encyclopedia is free to download, with in-app purchases available.

### Do OceanTree or こどもずかん Kids' Encyclopedia have ads?

Neither OceanTree nor こどもずかん Kids' Encyclopedia shows ads.

### Which is updated more often, OceanTree or こどもずかん Kids' Encyclopedia?

OceanTree ships an update every 2 months, and こどもずかん Kids' Encyclopedia monthly. Most recently, OceanTree was updated on November 5, 2026 and こどもずかん Kids' Encyclopedia 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.*