# Zetamac Arithmetic Practice vs JustLmk

The clearest difference is rating: JustLmk at 5.0 against Zetamac Arithmetic Practice's 4.7. JustLmk also leads on review sentiment (100% vs 83%). Zetamac Arithmetic Practice's advantage is ratings volume (18 vs 3). On price, update cadence, ads and in-app purchases there is nothing between them.

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

JustLmk holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Zetamac Arithmetic Practice has 18 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 83% of Zetamac Arithmetic Practice's written reviews are positive against 100% of JustLmk's.

Zetamac Arithmetic Practice ships an update daily, JustLmk every 2 days. The most recent releases landed on October 18, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Zetamac Arithmetic Practice | JustLmk |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (18 ratings)](https://appshunter.io/ios/app/zetamac-arithmetic-practice/id6737153617/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/justlmk/id6762502415/reviews)** |
| Number of ratings | **18** | 3 |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 days |
| Monetization | Free | Free |
| Size | 1 MB | 4 MB |
| Requires iOS | 17.5 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Joseph Ma](https://appshunter.io/developer/1774979062) | [Mehul Jasti](https://appshunter.io/developer/1759822616) |

## What reviewers say

### Zetamac Arithmetic Practice

[App page](https://appshunter.io/ios/app/zetamac-arithmetic-practice/id6737153617)

This app offers mental math practice tailored for quantitative finance professionals. It focuses on improving calculation speed and accuracy for complex numerical problems.

**Highlights:** Mental math practice, Quantitative finance focus, Calculation speed improvement, Accuracy enhancement, Numerical problem solving

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

**In-app purchases:** none


### JustLmk

[App page](https://appshunter.io/ios/app/justlmk/id6762502415)

Never miss a class or a library spot again. This app notifies you when desired spots become available, helping you secure your place in popular courses and study locations.

**Highlights:** Class availability notifications, Library spot alerts, Subscribe to desired spots, Real-time updates, Easy-to-use interface

**In-app purchases:** none


## Frequently asked questions

### Is Zetamac Arithmetic Practice free?

Zetamac Arithmetic Practice is free to download, with no in-app purchases.

### Is JustLmk free?

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

### Which has better reviews, Zetamac Arithmetic Practice or JustLmk?

JustLmk is rated higher. Zetamac Arithmetic Practice averages 4.7 out of 5 from 18 ratings, while JustLmk averages 5.0 from 3 ratings.

### Do Zetamac Arithmetic Practice or JustLmk have ads?

Neither Zetamac Arithmetic Practice nor JustLmk shows ads.

### Which is updated more often, Zetamac Arithmetic Practice or JustLmk?

Zetamac Arithmetic Practice ships an update daily, and JustLmk every 2 days. Most recently, Zetamac Arithmetic Practice was updated on October 18, 2026 and JustLmk on October 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.*