# Unit Converter vs CallShield

The clearest difference is in-app purchases: Unit Converter at none against CallShield's 5. CallShield's advantage is ads (none vs shown) and update cadence (every 2 days vs every 4 months). On price and device support there is nothing between them.

Both are free to download. CallShield sells 5 in-app purchases, starting at $2.99 per month. Unit Converter asks for nothing beyond the download.

Unit Converter ships an update every 4 months, CallShield every 2 days. The most recent releases landed on October 31, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Unit Converter | CallShield |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/callshield-scam-call-blocker/id6802440221/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 36 MB | 15 MB |
| Requires iOS | 18.2 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Emad Alhalabi](https://appshunter.io/developer/1869432996) | [Steven Hall](https://appshunter.io/developer/6802440223) |

## What reviewers say

### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-offline/id6758582848)

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

**In-app purchases:** none


### CallShield

[App page](https://appshunter.io/ios/app/callshield-scam-call-blocker/id6802440221)

This app helps you avoid unwanted calls by identifying and blocking scam numbers. It labels suspicious calls and silences those with strong evidence of being fraudulent, while also filing scam texts to your spam folder. You can report new scam numbers to help protect others.

**Highlights:** Silences scam calls, Labels suspicious calls, Files scam texts to spam, One-tap number reporting, Explains scam types, Contacts always ring through

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Individual | $2.99 | per month |
| Family | $4.99 | per month |
| Individual | $24.99 | per year |
| Family | $39.99 | per year |
| 3-Day Trial | Free | one-time |


## Frequently asked questions

### Is Unit Converter free?

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

### Is CallShield free?

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

### Do Unit Converter or CallShield have ads?

Unit Converter shows ads; CallShield does not.

### Which is updated more often, Unit Converter or CallShield?

Unit Converter ships an update every 4 months, and CallShield every 2 days. Most recently, Unit Converter was updated on October 31, 2026 and CallShield on November 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.*