# DuelTool vs MB 89F Standard Calculator

The clearest difference is in-app purchases: DuelTool at none against MB 89F Standard Calculator's 1. DuelTool also leads on iOS requirement (7.0 vs 16.0). MB 89F Standard Calculator's advantage is update cadence (daily vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. MB 89F Standard Calculator sells 1 one-off in-app purchase. DuelTool asks for nothing beyond the download.

DuelTool ships an update every 2 months, MB 89F Standard Calculator daily. The most recent releases landed on October 23, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | DuelTool | MB 89F Standard Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Free | — |
| Size | 1 MB | 1 MB |
| Requires iOS | **7.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [People Software Corporation](https://appshunter.io/developer/433853161) | [Maxwell Bayman](https://appshunter.io/developer/6784355391) |

## What reviewers say

### DuelTool

[App page](https://appshunter.io/ios/app/dueltool/id836442259)

This utility helps manage life points and battle calculations for YU-GI-OH! duels. It features intuitive controls for increasing or decreasing life points, calculating battle damage, and supports special card effects. Additional functions include dice rolling, coin flips, and undo/reset options for a smoother gameplay experience.

**Highlights:** Life Point calculation, Battle Phase damage calculation, Special card effect support, Dice and coin support, Undo and reset functions, Customizable buttons

**In-app purchases:** none


### MB 89F Standard Calculator

[App page](https://appshunter.io/ios/app/mb-89f-standard-calculator/id6788451890)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MB-89F Full Unlock | $3.99 | one-time |


## Frequently asked questions

### Is DuelTool free?

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

### Is MB 89F Standard Calculator free?

MB 89F Standard Calculator is free to download, with in-app purchases available.

### Do DuelTool or MB 89F Standard Calculator have ads?

Neither DuelTool nor MB 89F Standard Calculator shows ads.

### Which is updated more often, DuelTool or MB 89F Standard Calculator?

DuelTool ships an update every 2 months, and MB 89F Standard Calculator daily. Most recently, DuelTool was updated on October 23, 2026 and MB 89F Standard Calculator on October 28, 2026.

---

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