# SigiCalc vs Find Prime Num

The clearest difference is update cadence: Find Prime Num at every 4 days against SigiCalc's every 48 months. Find Prime Num also leads on iOS requirement (12.0 vs 17.0). On price, rating, review sentiment and ratings volume there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for SigiCalc against 5.0 for Find Prime Num. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 50% and 50% positive.

SigiCalc ships an update every 48 months, Find Prime Num every 4 days. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | SigiCalc | Find Prime Num |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/sigicalc/id522503444/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/find-prime-num/id1505409395/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 4 days** |
| Monetization | Free | Free |
| Size | 3 MB | 8 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Siegware](https://appshunter.io/developer/443908611) | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) |

## What reviewers say

### SigiCalc

[App page](https://appshunter.io/ios/app/sigicalc/id522503444)

This app provides a graphical RPN calculator with an undo feature. Users can input mathematical equations and instantly visualize them with a plot. It's designed for simplicity and practicality in mathematical calculations.

**Highlights:** Graphical RPN calculator, Equation plotting, Undo functionality, Simple interface, Practical calculations

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Find Prime Num

[App page](https://appshunter.io/ios/app/find-prime-num/id1505409395)

Quickly determine if a number is prime and find one of its factors. This app also measures calculation time to help you benchmark your device's processing speed. Share your results and compare performance with others.

**Highlights:** Calculate prime numbers up to 64-bit integers, Measure processing time for device speed comparison, Find one factor of a non-prime number, Share calculation results, User-friendly interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SigiCalc free?

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

### Is Find Prime Num free?

Find Prime Num is free to download, with no in-app purchases.

### Which has better reviews, SigiCalc or Find Prime Num?

SigiCalc and Find Prime Num are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do SigiCalc or Find Prime Num have ads?

Neither SigiCalc nor Find Prime Num shows ads.

### Which is updated more often, SigiCalc or Find Prime Num?

SigiCalc ships an update every 48 months, and Find Prime Num every 4 days. Most recently, SigiCalc was updated on November 1, 2026 and Find Prime Num on November 3, 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.*