# Oyster ◦ Sea Shell Identifier vs ShellsBook

Oyster ◦ Sea Shell Identifier and ShellsBook are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support 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. Oyster ◦ Sea Shell Identifier sells 2 in-app purchases, starting at $2.99 per 7 days and ShellsBook sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Oyster ◦ Sea Shell Identifier | ShellsBook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Size | 21 MB | 1 MB |
| Requires iOS | 18.6 | **18.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ikhwan Noorsetyo](https://appshunter.io/developer/1739847271) | [Mitaanshu Agarwal](https://appshunter.io/developer/1896724075) |

## What reviewers say

### Oyster ◦ Sea Shell Identifier

[App page](https://appshunter.io/ios/app/oyster-sea-shell-identifier/id6758259029)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $2.99 | per 7 days |
| Yearly Subscription | $44.99 | per year |


### ShellsBook

[App page](https://appshunter.io/ios/app/shellsbook/id6773482243)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ShellsBook Pro Monthly | $4.99 | per month |
| ShellsBook Pro Yearly | $24.90 | per year |


## Frequently asked questions

### Is Oyster ◦ Sea Shell Identifier free?

Oyster ◦ Sea Shell Identifier is free to download, with in-app purchases available.

### Is ShellsBook free?

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

### Do Oyster ◦ Sea Shell Identifier or ShellsBook have ads?

Neither Oyster ◦ Sea Shell Identifier nor ShellsBook shows ads.

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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.*