# Just A Calc vs PrimeCalc

The clearest difference is ads: Just A Calc at none against PrimeCalc's shown. PrimeCalc's advantage is update cadence (every 5 weeks vs every 38 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

Just A Calc ships an update every 38 months, PrimeCalc every 5 weeks. Both last shipped on November 2, 2026.

## The numbers

| Metric | Just A Calc | PrimeCalc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 38 months | **Every 5 weeks** |
| Size | 10 MB | 12 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tom Doherty](https://appshunter.io/developer/1112286724) | [Yutaka Nakao](https://appshunter.io/developer/1303008060) |

## What reviewers say

### Just A Calc

[App page](https://appshunter.io/ios/app/just-a-calc/id1112349564)

**Features:** macOS Compatibility

**In-app purchases:** none


### PrimeCalc

[App page](https://appshunter.io/ios/app/primecalc-modprime-factor/id1332239791)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Just A Calc free?

Just A Calc is free to download, with no in-app purchases.

### Is PrimeCalc free?

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

### Do Just A Calc or PrimeCalc have ads?

PrimeCalc shows ads; Just A Calc does not.

### Which is updated more often, Just A Calc or PrimeCalc?

Just A Calc ships an update every 38 months, and PrimeCalc every 5 weeks. Most recently, Just A Calc was updated on November 2, 2026 and PrimeCalc on November 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*