Napier's Bones Simulation vs SISO Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Napier's Bones Simulation
Read full descriptionHide full description
John Napier's contribution to mathematics was truly significant. Born in Scotland, Napier studied as a mathematician, physicist and astronomer. He is best known as the inventor of logarithms, but he also invented one of the first computing devices. The device, known as Napier's Bones, is manually operated and can be used to find the products and quotients of numbers. Napier's device was based on Arab mathematics and used the lattice method of multiplication. Each of the rods are inscribed with the multiplication tables for a specific number. By arranging the rods on the board, the product of two numbers can be found by performing addition operations. Use the Napier's Bones app to learn how one of the earliest calculating devices worked. More than 400 years ago, people used Napier's Bones to find the product of large numbers. In using this simulation you will discover a new way to multiply. Have fun!
SISO Calculator
This app helps engineers and students understand System Dynamics and Controls. It offers an intuitive interface to quickly analyze controller and plant interactions in both time and frequency domains.
- System Dynamics analysis
- Controls engineering
- Intuitive interface
- Time domain analysis
- Frequency domain analysis
- Controller interaction visualization
Read full descriptionHide full description
SISO Calculator was built to help practicing engineers and students get an intuitive sense of System Dynamics and Controls. The interface is focused so you can quickly interact with controllers and plants to see immediately how time and frequency interact and how controllers behave.
Screenshots
Verdict
The clearest difference is price: SISO Calculator at Free against Napier's Bones Simulation's $1.99. SISO Calculator also leads on update cadence (every 5 weeks vs every 25 months). Napier's Bones Simulation's advantage is iOS requirement (12.0 vs 14.0). On ads, in-app purchases and device support 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
SISO Calculator is free to download; Napier's Bones Simulation costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Napier's Bones Simulation ships an update every 25 months, SISO Calculator every 5 weeks. The most recent releases landed on October 26, 2026 and October 20, 2026 respectively.
| Parameter | Napier's Bones Simulation | SISO Calculator |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 25 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod, Apple TV — better | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 29 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Ventura Educational Systems | Deft Dynamics |
In-app purchases
Napier's Bones Simulation
No in-app purchases
SISO Calculator
No in-app purchases
Questions
Is Napier's Bones Simulation free?
Is SISO Calculator free?
Do Napier's Bones Simulation or SISO Calculator have ads?
Which is updated more often, Napier's Bones Simulation or SISO Calculator?
Other comparisons
