# Contacts Duster vs The Wrong Calculator

The clearest difference is review sentiment: The Wrong Calculator at 100% against Contacts Duster's 51%. The Wrong Calculator also leads on rating (5.0 vs 3.0) and in-app purchases (none vs 8). Contacts Duster's advantage is ratings volume (23 vs 2). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Contacts Duster sells 8 in-app purchases, starting at $2.99 per month. The Wrong Calculator asks for nothing beyond the download.

The Wrong Calculator holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: Contacts Duster has 23 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 51% of Contacts Duster's written reviews are positive against 100% of The Wrong Calculator's.

Contacts Duster ships an update weekly, The Wrong Calculator every 2 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Contacts Duster | The Wrong Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (23 ratings)](https://appshunter.io/ios/app/contacts-duster-cleaner/id375973177/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/the-wrong-calculator/id6752529432/reviews)** |
| Number of ratings | **23** | 2 |
| Positive reviews | 51.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 11 MB | 6 MB |
| Requires iOS | **17.0** | 18.5 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [MyClickapps.com LLC](https://appshunter.io/developer/303611122) | [Sameel Mawani](https://appshunter.io/developer/1839694206) |

## What reviewers say

### Contacts Duster

[App page](https://appshunter.io/ios/app/contacts-duster-cleaner/id375973177)

This app helps you clean up your iPhone or iPad contacts by detecting and merging duplicate entries. It offers features to manage your address book efficiently, including cleaning 'zombies' and visualizing your contact data. Cloud backup is available via in-app purchase.

**Highlights:** Detect and merge duplicate contacts, Clean 'zombie' contacts, In-app backup and restore, Visualize address book with pie graph, Cloud backup of contacts, Localized in 12 languages

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cloud Backup Monthly | $2.99 | per month |
| Cloud Backup Yearly | $19.99 | per year |
| Groups Manager | $0.99 | one-time |
| Pro | $0.99 | one-time |
| Auto Dust | $1.99 | one-time |
| Pro | $2.99 | one-time |
| Pro upgrade | $4.99 | one-time |
| Cloud Backup Lifetime | $19.99 | one-time |

**What reviewers like**

- 🚀 Efficient contact cleaning
- 👍 Useful for organizing contacts
- 🔒 Backup and sync features
- 👍 Simple and easy to use

**What reviewers complain about**

- 🐛 Crashes and bugs
- 💰 Paywall for full functionality
- 🤔 Unclear feature limitations in free version
- 🤷‍♀️ Inconsistent performance

**Reported bugs**

- Crashes during contact cleaning
- Deletes valid contacts
- Fails to detect all duplicate contacts
- Syncing issues with iCloud and other services

**Requested features**

- Allow merging of contact groups
- Provide more granular control over contact management
- Improve duplicate detection accuracy
- Add support for more cloud storage services


### The Wrong Calculator

[App page](https://appshunter.io/ios/app/the-wrong-calculator/id6752529432)

This utility app challenges your brain by shuffling number positions after each input, forcing you to stay focused and break autopilot habits. It offers a unique way to perform calculations while engaging in cognitive exercise and mental workouts.

**Highlights:** Dynamic number shuffling, Math games, Intuitive interface, Smooth animations, Brain training benefits

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Contacts Duster free?

Contacts Duster is free to download, with in-app purchases available.

### Is The Wrong Calculator free?

The Wrong Calculator is free to download, with no in-app purchases.

### Which has better reviews, Contacts Duster or The Wrong Calculator?

The Wrong Calculator is rated higher. Contacts Duster averages 3.0 out of 5 from 23 ratings, while The Wrong Calculator averages 5.0 from 2 ratings.

### Do Contacts Duster or The Wrong Calculator have ads?

Neither Contacts Duster nor The Wrong Calculator shows ads.

### Which is updated more often, Contacts Duster or The Wrong Calculator?

Contacts Duster ships an update weekly, and The Wrong Calculator every 2 days. Most recently, Contacts Duster was updated on October 24, 2026 and The Wrong Calculator on October 24, 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.*