# Is it Prime? vs TattBook

The clearest difference is rating: TattBook at 5.0 against Is it Prime?'s 3.2. TattBook also leads on update cadence (every 4 months vs every 74 months). Is it Prime?'s advantage is ratings volume (5 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

TattBook holds the better App Store score, 5.0 against 3.2. That said, the two scores are not equally well evidenced: Is it Prime? has 5 ratings behind it against 1, so its average is the more settled of the two.

Is it Prime? ships an update every 74 months, TattBook every 4 months. The most recent releases landed on October 31, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Is it Prime? | TattBook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.2 (5 ratings)](https://appshunter.io/ios/app/is-it-prime/id326095651/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tattbook/id6755887349/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 74 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 1 MB | 13 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Wismar](https://appshunter.io/developer/307757950) | [SmartBookMe Inc](https://appshunter.io/developer/1849545989) |

## What reviewers say

### Is it Prime?

[App page](https://appshunter.io/ios/app/is-it-prime/id326095651)

Enter any number to instantly determine if it is a prime number or not. This straightforward utility provides a quick answer to your mathematical curiosity.

**Highlights:** Prime number identification, Simple number input, Instant yes/no results

**Features:** macOS Compatibility

**In-app purchases:** none


### TattBook

[App page](https://appshunter.io/ios/app/tattbook/id6755887349)

This app simplifies tattoo appointment management for artists. Customize your portfolio and website design with no technical expertise needed. Keep all client information organized in one convenient place.

**Highlights:** Appointment management, Portfolio customization, Client organization, Website design, No tech skills required

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Is it Prime? free?

Is it Prime? is free to download, with no in-app purchases.

### Is TattBook free?

TattBook is free to download, with no in-app purchases.

### Which has better reviews, Is it Prime? or TattBook?

TattBook is rated higher. Is it Prime? averages 3.2 out of 5 from 5 ratings, while TattBook averages 5.0 from 1 ratings.

### Do Is it Prime? or TattBook have ads?

Neither Is it Prime? nor TattBook shows ads.

### Which is updated more often, Is it Prime? or TattBook?

Is it Prime? ships an update every 74 months, and TattBook every 4 months. Most recently, Is it Prime? was updated on October 31, 2026 and TattBook on October 30, 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.*