# Unit Converter All vs Strongbox Zero

The clearest difference is price: Unit Converter All at $9.99 against Strongbox Zero's $99.99. Unit Converter All also leads on iOS requirement (12.0 vs 15.0). Strongbox Zero's advantage is update cadence (every 2 weeks vs every 3 months) and ratings volume (21 vs 7). On rating, review sentiment, ads and in-app purchases there is nothing between them.

Unit Converter All costs $9.99 and Strongbox Zero $99.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.3 for Unit Converter All against 4.3 for Strongbox Zero. Both are backed by a comparable volume of ratings — 7 and 21 respectively. Written reviews are what separate them: 80% of Unit Converter All's written reviews are positive against 75% of Strongbox Zero's.

Unit Converter All ships an update every 3 months, Strongbox Zero every 2 weeks. The most recent releases landed on October 24, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Unit Converter All | Strongbox Zero |
| --- | --- | --- |
| Price | **$9.99** | $99.99 |
| Rating | [4.3 (7 ratings)](https://appshunter.io/ios/app/unit-converter-all-in-1/id1061932606/reviews) | **[4.3 (21 ratings)](https://appshunter.io/ios/app/strongbox-zero/id1581589638/reviews)** |
| Number of ratings | 7 | **21** |
| Positive reviews | **80.0% of reviews** | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Paid | Paid |
| Size | 13 MB | 96 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod, Mac | **iPhone, iPad, iPod, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Intemodino Group s.r.o.](https://appshunter.io/developer/557849644) | [Phoebe Code Limited](https://appshunter.io/developer/897283734) |

## What reviewers say

### Unit Converter All

[App page](https://appshunter.io/ios/app/unit-converter-all-in-1/id1061932606)

Easily convert between a vast array of US, imperial, and metric units across multiple categories including length, area, volume, weight, and temperature. This comprehensive tool supports numerous specific units within each conversion type.

**Highlights:** Length conversion, Area conversion, Volume conversion, Weight conversion, Temperature conversion, Speed conversion, Power conversion, Pressure conversion

**Features:** Vision Pro support

**In-app purchases:** none


### Strongbox Zero

[App page](https://appshunter.io/ios/app/strongbox-zero/id1581589638)

This app securely stores and protects your passwords with a master password. It supports open-source formats and offers advanced security features like biometric unlock and hardware token protection. It's designed for users who prefer a local-only password management solution.

**Highlights:** Local-only password storage, Biometric and PIN unlock, YubiKey hardware token protection, Military-grade cryptography, Password auditing for weak passwords, Secure document attachment viewer, Import/Export via Files app and Email

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter All free?

Unit Converter All costs $9.99, with no in-app purchases.

### Is Strongbox Zero free?

Strongbox Zero costs $99.99, with no in-app purchases.

### Which has better reviews, Unit Converter All or Strongbox Zero?

Strongbox Zero is rated higher. Unit Converter All averages 4.3 out of 5 from 7 ratings, while Strongbox Zero averages 4.3 from 21 ratings.

### Do Unit Converter All or Strongbox Zero have ads?

Neither Unit Converter All nor Strongbox Zero shows ads.

### Which is updated more often, Unit Converter All or Strongbox Zero?

Unit Converter All ships an update every 3 months, and Strongbox Zero every 2 weeks. Most recently, Unit Converter All was updated on October 24, 2026 and Strongbox Zero on November 3, 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.*