# Prime Checker vs TeXmemo

The clearest difference is ads: Prime Checker at none against TeXmemo's shown. Prime Checker also leads on review sentiment (96% vs 67%) and monetization model (free vs ad-supported). TeXmemo's advantage is update cadence (daily vs every 17 months). On price, in-app purchases and device support there is nothing between them.

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

Prime Checker ships an update every 17 months, TeXmemo daily. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Prime Checker | TeXmemo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/prime-checker/id389112910/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | **95.8% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 17 months | **Daily** |
| Monetization | **Free** | Ad-supported |
| Size | 3 MB | 12 MB |
| Requires iOS | **12.4** | 14.2 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heart Solutions, Inc.](https://appshunter.io/developer/389112913) | [Joonha Kwon](https://appshunter.io/developer/1495592559) |

## What reviewers say

### Prime Checker

[App page](https://appshunter.io/ios/app/prime-checker/id389112910)

This app performs advanced mathematical calculations for numbers, including integer factorization, Euler's totient function, and solving specific Diophantine equations. It utilizes advanced algorithms for factorization and primality testing.

**Highlights:** Integer factorization, Euler's totient function, Primitive root calculation, Diophantine equation solver, Primality testing

**Features:** macOS Compatibility

**In-app purchases:** none


### TeXmemo

[App page](https://appshunter.io/ios/app/texmemo/id1544196945)

This simple note-taking app allows users to beautifully tweet text containing mathematical formulas. It automatically adds margins for clear visibility of equations on timelines.

**Highlights:** Tweet text with math formulas, Automatic margin addition, Clear equation display on timelines, Simple note-taking interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Prime Checker free?

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

### Is TeXmemo free?

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

### Do Prime Checker or TeXmemo have ads?

TeXmemo shows ads; Prime Checker does not.

### Which is updated more often, Prime Checker or TeXmemo?

Prime Checker ships an update every 17 months, and TeXmemo daily. Most recently, Prime Checker was updated on November 1, 2026 and TeXmemo 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.*