Is it Prime? vs TattBook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Is it Prime?
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.
- Prime number identification
- Simple number input
- Instant yes/no results
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This application serves only one function - to satisfy your curiosity when you wonder whether a given number is prime or not. You put in the number, it says yes or no. Really, that's all it does.
TattBook
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.
- Appointment management
- Portfolio customization
- Client organization
- Website design
- No tech skills required
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Start getting booked online with TattBook — the all-in-one booking tool for tattoo artists. With TattBook, you can get discovered by new clients and run your studio like a professional. Manage appointments, accept payments online, collect deposits, and create your own personalized booking link. Stop chasing messages and let clients book with you 24/7. TattBook also includes automatic appointment reminders, customizable booking forms, a portfolio to showcase your work, and everything you need to grow your tattoo business. No tech skills required. Download TattBook for free today! Learn more at https://tattbook.com
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Is it Prime? | TattBook |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (5 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 71.4% of reviews | — |
| Number of ratings | 5 — better | 1 |
| Update frequency | Every 74 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 1 MB | 13 MB |
| Age rating | 4+ | 17+ |
| Developer | Wismar | SmartBookMe Inc |
Customer experience
Is it Prime?
TattBook
In-app purchases
Is it Prime?
No in-app purchases
TattBook
No in-app purchases
