# Napier's Bones Simulation vs Abacus

The clearest difference is update cadence: Abacus at every 9 months against Napier's Bones Simulation's every 25 months. Napier's Bones Simulation's advantage is price ($1.99 vs $2.99) and iOS requirement (12.0 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

Napier's Bones Simulation costs $1.99 and Abacus $2.99 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, Abacus every 9 months. The most recent releases landed on October 9, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Napier's Bones Simulation | Abacus |
| --- | --- | --- |
| Price | **$1.99** | $2.99 |
| Positive reviews | — | 15.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 25 months | **Every 9 months** |
| Monetization | — | Paid |
| Size | 29 MB | 12 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Apple TV** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [俊 姜](https://appshunter.io/developer/974809005) |

## What reviewers say

### Napier's Bones Simulation

[App page](https://appshunter.io/ios/app/napiers-bones-simulation/id1093899282)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Abacus

[App page](https://appshunter.io/ios/app/abacus-dancing-fingers/id1153561673)

This educational app combines ancient calculation wisdom with modern technology. It features a beautiful interface with large beads, supports decimal points and negative numbers, and offers multilingual support for a fun and engaging learning experience.

**Highlights:** Beautiful interface with large beads, Support for decimal points and negative numbers, 21-column abacus, Multilingual support (19 languages), Interactive calculation examples

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Napier's Bones Simulation free?

Napier's Bones Simulation costs $1.99, with no in-app purchases.

### Is Abacus free?

Abacus costs $2.99, with no in-app purchases.

### Do Napier's Bones Simulation or Abacus have ads?

Neither Napier's Bones Simulation nor Abacus shows ads.

### Which is updated more often, Napier's Bones Simulation or Abacus?

Napier's Bones Simulation ships an update every 25 months, and Abacus every 9 months. Most recently, Napier's Bones Simulation was updated on October 9, 2026 and Abacus on October 18, 2026.

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