Is it Prime? vs Just A Calc
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.
Just A Calc
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This is Just A Calculator, nothing more, nothing less. The calculator will perform addition, subtraction, multiplication, division, percentage calculations, and find the square root. This will allow a maximum 38 digits to the left of the decimal and a maximum of 12 digits to the right of the decimal. This was developed primarily for the iPhone, however it will work on any iOS device.
Screenshots
Verdict
The clearest difference is iOS requirement: Just A Calc at 12.0 against Is it Prime?'s 15.0. On price, update cadence, ads and in-app purchases 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.
Is it Prime? ships an update every 74 months, Just A Calc every 38 months. The most recent releases landed on October 31, 2026 and November 2, 2026 respectively.
| Parameter | Is it Prime? | Just A Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (5 ratings) — better | — |
| Positive reviews | 71.4% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 74 months | Every 38 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Wismar | Tom Doherty |
In-app purchases
Is it Prime?
No in-app purchases
Just A Calc
No in-app purchases
Questions
Is Is it Prime? free?
Is Just A Calc free?
Do Is it Prime? or Just A Calc have ads?
Which is updated more often, Is it Prime? or Just A Calc?
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