# Is it Prime? vs InterCalc

The clearest difference is rating: InterCalc at 5.0 against Is it Prime?'s 3.2. InterCalc also leads on update cadence (every 11 months vs every 74 months). Is it Prime?'s advantage is ratings volume (5 vs 1) and iOS requirement (15.0 vs 18.6). 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.

InterCalc 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, InterCalc every 11 months. The most recent releases landed on October 23, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Is it Prime? | InterCalc |
| --- | --- | --- |
| 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/intercalc/id498391316/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 11 months** |
| Monetization | Free | Free |
| Size | 1 MB | 1 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Wismar](https://appshunter.io/developer/307757950) | [River Rock Logic](https://appshunter.io/developer/340225113) |

## 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


### InterCalc

[App page](https://appshunter.io/ios/app/intercalc/id498391316)

This app performs linear interpolation using a set of X-Y values to define a relationship. It can calculate values based on defined points, useful for tasks like converting pressure readings to fluid volumes in containers or performing simple unit conversions.

**Highlights:** Linear interpolation of X-Y values, Defines arbitrary functions from data points, Calculates fluid volume from pressure readings, Performs unit conversions (e.g., temperature, speed), Supports custom data sets

**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 InterCalc free?

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

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

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

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

Neither Is it Prime? nor InterCalc shows ads.

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

Is it Prime? ships an update every 74 months, and InterCalc every 11 months. Most recently, Is it Prime? was updated on October 23, 2026 and InterCalc on October 17, 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.*