Abacus Lesson vs NPS SDNR Teacher
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Abacus Lesson
Learn multiplication using a virtual abacus. This app teaches a simple and fast method for calculating multiplication, emphasizing the mental calculation benefits of the abacus over digital calculators.
- Virtual abacus for multiplication
- Simple and fast calculation methods
- Focus on mental calculation skills
- Step-by-step multiplication lessons
- Suitable for beginners
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An abacus is named "Soroban" in Japan. Do you know what an abacus is? The abacus is very simple calculator used in China, Japan, Korea and so on. Some people may say "Isn't it an unnecessary tool if you have a calculator such as a smartphone?". Answer would be "No". The biggest difference between electric calculators and the abacus is whether you need to hold it in your hand when calculating. Because of its simplicity, you will be able to easily use the abacus in your mind. In the app, we will explain simple and fast method of the multiplication using the abacus. To learn multiplication, it is essential to be able to add with an abacus. If you are new to addition and subtraction, we recommend that You first learn with the following app. https://apps.apple.com/us/app/abacus-lesson-add-sub/id1526785916 This app will give you the skill of calculation of multiplication.
NPS SDNR Teacher
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Acadamis - An adaptive technical system packaged for educational institutions, which includes several modules that provide support to the teachers in enabling them to increase productivity by automation of several processes and procedures. It also enables and supports parents to get updated details about students and happenings at the educational institution.
Screenshots
Verdict
The clearest difference is in-app purchases: NPS SDNR Teacher at none against Abacus Lesson's 3. NPS SDNR Teacher also leads on ads (none vs shown). Abacus Lesson's advantage is update cadence (every 2 weeks vs every 28 months). On price, device support and iOS requirement 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. Abacus Lesson sells 3 one-off in-app purchases. NPS SDNR Teacher asks for nothing beyond the download.
Abacus Lesson ships an update every 2 weeks, NPS SDNR Teacher every 28 months. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.
| Parameter | Abacus Lesson | NPS SDNR Teacher |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (15 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 15 — better | — |
| Update frequency | Every 2 weeks — better | Every 28 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 138 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Hirokazu Komatsu | Chandra Sekhar Kalubandi |
In-app purchases
Abacus Lesson
- Donation Lv1 for hiding Ad$1.99
- Donation Lv2 for hiding Ad$3.99
- Donation Lv3 for hiding Ad$8.99
NPS SDNR Teacher
No in-app purchases
Questions
Is Abacus Lesson free?
Is NPS SDNR Teacher free?
Do Abacus Lesson or NPS SDNR Teacher have ads?
Which is updated more often, Abacus Lesson or NPS SDNR Teacher?
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