# All Unit Conversion vs Conversion Calculator

The clearest difference is review sentiment: Conversion Calculator at 100% against All Unit Conversion's 50%. Conversion Calculator also leads on rating (4.8 vs 4.6) and ratings volume (157 vs 17). All Unit Conversion's advantage is in-app purchases (none vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Conversion Calculator sells 1 one-off in-app purchase. All Unit Conversion asks for nothing beyond the download.

Conversion Calculator holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Conversion Calculator has 157 ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 50% of All Unit Conversion's written reviews are positive against 100% of Conversion Calculator's.

All Unit Conversion ships an update every 2 months, Conversion Calculator every 5 weeks. The most recent releases landed on September 13, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | All Unit Conversion | Conversion Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (17 ratings)](https://appshunter.io/ios/app/all-unit-conversion/id1418597453/reviews) | **[4.8 (157 ratings)](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523/reviews)** |
| Number of ratings | 17 | **157** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 22 MB | 7 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Tiago Do Couto](https://appshunter.io/developer/1291604717) | [Collins Cheruiyot](https://appshunter.io/developer/1579009978) |

## What reviewers say

### All Unit Conversion

[App page](https://appshunter.io/ios/app/all-unit-conversion/id1418597453)

Easily convert between various units of measurement with this free utility app. It supports conversions for length, area, volume, mass, time, digital storage, energy, and currency.

**Highlights:** Length conversion, Area conversion, Volume conversion, Mass conversion, Time conversion, Currency conversion

**Features:** macOS Compatibility

**In-app purchases:** none


### Conversion Calculator

[App page](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523)

Easily convert between metric and imperial units for weight, length, temperature, area, and time. This app offers precise, fast results with a clean interface, working offline for daily, travel, school, or work needs.

**Highlights:** Metric and imperial unit conversion, Weight, length, temperature, area, time, Offline functionality, Precise and fast results, Clean and minimal interface, Over 100 measurement types

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited access forever | $8.99 | one-time |


## Frequently asked questions

### Is All Unit Conversion free?

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

### Is Conversion Calculator free?

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

### Which has better reviews, All Unit Conversion or Conversion Calculator?

Conversion Calculator is rated higher. All Unit Conversion averages 4.6 out of 5 from 17 ratings, while Conversion Calculator averages 4.8 from 157 ratings.

### Do All Unit Conversion or Conversion Calculator have ads?

Neither All Unit Conversion nor Conversion Calculator shows ads.

### Which is updated more often, All Unit Conversion or Conversion Calculator?

All Unit Conversion ships an update every 2 months, and Conversion Calculator every 5 weeks. Most recently, All Unit Conversion was updated on September 13, 2026 and Conversion Calculator on September 26, 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.*