Zetamac Arithmetic Practice vs JustLmk
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zetamac Arithmetic Practice
This app offers mental math practice tailored for quantitative finance professionals. It focuses on improving calculation speed and accuracy for complex numerical problems.
- Mental math practice
- Quantitative finance focus
- Calculation speed improvement
- Accuracy enhancement
- Numerical problem solving
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Zetamac - A mental math practice app used in the Quantitative Finance world.
JustLmk
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.
- Class availability notifications
- Library spot alerts
- Subscribe to desired spots
- Real-time updates
- Easy-to-use interface
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Tired of missing out on the classes you need because they fill up too quickly? Use JustLmk to subscribe to classes and get a notification when they open. Can't find a spot in the library? Use JustLmk to find out about that too!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Zetamac Arithmetic Practice | JustLmk |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (18 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 83.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 18 — better | 3 |
| Update frequency | Daily — better | Every 2 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.5 | 16.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Joseph Ma | Mehul Jasti |
Customer experience
Zetamac Arithmetic Practice
JustLmk
In-app purchases
Zetamac Arithmetic Practice
No in-app purchases
JustLmk
No in-app purchases
Questions
Is Zetamac Arithmetic Practice free?
Is JustLmk free?
Which has better reviews, Zetamac Arithmetic Practice or JustLmk?
Do Zetamac Arithmetic Practice or JustLmk have ads?
Which is updated more often, Zetamac Arithmetic Practice or JustLmk?
Other comparisons
