# Know Abacus vs SB exam

The clearest difference is rating: Know Abacus at 4.7 against SB exam's 3.0. Know Abacus also leads on ratings volume (67 vs 1). SB exam's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Know Abacus sells 1 one-off in-app purchase. SB exam asks for nothing beyond the download.

Know Abacus holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Know Abacus has 67 ratings behind it against 1, so its average is the more settled of the two.

Know Abacus ships an update every 2 months, SB exam every 5 weeks. The most recent releases landed on July 6, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | Know Abacus | SB exam |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (67 ratings)](https://appshunter.io/ios/app/know-abacus/id641867438/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/sb-exam/id1580530771/reviews) |
| Number of ratings | **67** | 1 |
| Positive reviews | 96.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 28 MB | 19 MB |
| Requires iOS | **11.0** | 12.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kittipong Mungnirun](https://appshunter.io/developer/488058533) | [JABJAI CORPORATION COMPANY LIMITED](https://appshunter.io/developer/1171077391) |

## What reviewers say

### Know Abacus

[App page](https://appshunter.io/ios/app/know-abacus/id641867438)

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.

**Highlights:** 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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### SB exam

[App page](https://appshunter.io/ios/app/sb-exam/id1580530771)

Create and manage K-12 tests and assessments with a variety of question types. Features automatic grading, detailed student results, and question-level statistics to adapt course material.

**Highlights:** Multiple question types (text, image, free text, fill-in-the-blank, video, audio, matching), Automatic grading with pass/fail levels, Individual student results tracking, Question-level statistics for course analysis, Data export to Excel, Real-time test creation and management

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Know Abacus free?

Know Abacus is free to download, with in-app purchases available.

### Is SB exam free?

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

### Which has better reviews, Know Abacus or SB exam?

Know Abacus is rated higher. Know Abacus averages 4.7 out of 5 from 67 ratings, while SB exam averages 3.0 from 1 ratings.

### Do Know Abacus or SB exam have ads?

Know Abacus shows ads; SB exam does not.

### Which is updated more often, Know Abacus or SB exam?

Know Abacus ships an update every 2 months, and SB exam every 5 weeks. Most recently, Know Abacus was updated on July 6, 2026 and SB exam on June 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*