Know Abacus vs Flash Mental Math
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Know Abacus
This app teaches children how to use an abacus for various math operations. It covers counting, addition, subtraction, multiplication, and division, helping to develop their mathematical abilities and brain potential. It offers multiple learning modes and customization options.
- Abacus counting
- Addition and subtraction (1 & 2 digits)
- Multiplication and division (1-2 digits)
- Mental math practice
- Review and random lessons
- Customizable abacus (color, touch)
- Multiple languages
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Abacus is a wonderful mathematical instrument used for calculation. This app will help your children learn about Abacus, Numbers, Counting, Addition, and Subtraction. This is the first step to tap the unexploited potential in their brain and unleash their mathematical capability. Suitable for children age 5 and up, who know about numbers and some basic addition and subtraction. For smaller children, recommend KnowNumber app. * Counting with Abacus * Addition/Subtraction 1 digit * Addition/Subtraction 2 digits * Multiplication 1-2 digits * Division 1-2 digits * Mental math * Review lessons * Unlimited random lessons * Black/white or colorful abacus * Learning modes * Two-touch or multi-touch abacus * Left-handed mode Localized Languages: * English, French, Spanish, Thai, Turkey, Arabic, Portuguese, and Russian
Flash Mental Math
Practice mental arithmetic with various difficulty levels and custom modes. This app serves as a brain training tool to enhance calculation skills.
- Mental arithmetic practice
- Easy, normal, and difficult modes
- Customizable modes
- Brain training
- Calculation skill improvement
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Flash mental arithmetic practice app In addition to the easy, normal, and difficult modes, there are also custom modes. It can also be a brain training to improve mental arithmetic
Screenshots
Verdict
The clearest difference is in-app purchases: Flash Mental Math at none against Know Abacus's 1. Know Abacus's advantage is ratings volume (67 vs 18) and iOS requirement (11.0 vs 15.6). On price, rating, update cadence and ads 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. Know Abacus sells 1 one-off in-app purchase. Flash Mental Math asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.7 for Know Abacus against 4.7 for Flash Mental Math. Both are backed by a comparable volume of ratings — 67 and 18 respectively.
Know Abacus ships an update every 2 months, Flash Mental Math every 3 months. The most recent releases landed on October 15, 2026 and September 29, 2026 respectively.
| Parameter | Know Abacus | Flash Mental Math |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (67 ratings) | 4.7 (18 ratings) |
| Positive reviews | 96.4% of reviews | — |
| Number of ratings | 67 — better | 18 |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 28 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Kittipong Mungnirun | Ryouhei Azuma |
Customer experience
Know Abacus
Flash Mental Math
In-app purchases
Know Abacus
- Remove Ads$2.99
Flash Mental Math
No in-app purchases
Questions
Is Know Abacus free?
Is Flash Mental Math free?
Which has better reviews, Know Abacus or Flash Mental Math?
Do Know Abacus or Flash Mental Math have ads?
Which is updated more often, Know Abacus or Flash Mental Math?
Other comparisons
