# Abacus' brain Lite vs Pi 100 Challenge

The clearest difference is price: Abacus' brain Lite at Free against Pi 100 Challenge's $0.99. Abacus' brain Lite also leads on update cadence (every 9 days vs every 3 weeks) and iOS requirement (6.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Abacus' brain Lite is free to download; Pi 100 Challenge costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Abacus' brain Lite ships an update every 9 days, Pi 100 Challenge every 3 weeks. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Abacus' brain Lite | Pi 100 Challenge |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/abacus-brain-lite/id382584167/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 56.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | Free | — |
| Size | 5 MB | 11 MB |
| Requires iOS | **6.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [POPPO STUDIO](https://appshunter.io/developer/304529440) | [Ram Rao](https://appshunter.io/developer/1724828937) |

## What reviewers say

### Abacus' brain Lite

[App page](https://appshunter.io/ios/app/abacus-brain-lite/id382584167)

This application helps users improve their mental calculation speed by simulating abacus use. It offers various levels of difficulty, progressing from single digits with longer time limits to faster calculations.

**Highlights:** Abacus simulation for mental calculation, Sequential addition of numbers, Adjustable difficulty levels, Flash mental calculation practice, Improve calculation speed

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

**In-app purchases:** none


### Pi 100 Challenge

[App page](https://appshunter.io/ios/app/pi-100-challenge/id6475694538)

**In-app purchases:** none


## Frequently asked questions

### Is Abacus' brain Lite free?

Abacus' brain Lite is free to download, with no in-app purchases.

### Is Pi 100 Challenge free?

Pi 100 Challenge costs $0.99, with no in-app purchases.

### Do Abacus' brain Lite or Pi 100 Challenge have ads?

Neither Abacus' brain Lite nor Pi 100 Challenge shows ads.

### Which is updated more often, Abacus' brain Lite or Pi 100 Challenge?

Abacus' brain Lite ships an update every 9 days, and Pi 100 Challenge every 3 weeks. Most recently, Abacus' brain Lite was updated on October 16, 2026 and Pi 100 Challenge on October 10, 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.*