# Unit Converter vs Shred Instructor

The clearest difference is in-app purchases: Shred Instructor at none against Unit Converter's 4. Shred Instructor also leads on ads (none vs shown) and iOS requirement (13.0 vs 17.0). Unit Converter's advantage is chart position (#94 vs unranked). On price, update cadence and device support there is nothing between them.

Both are free to download. Unit Converter sells 4 in-app purchases, starting at $3.99 per month. Shred Instructor asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 20, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Unit Converter | Shred Instructor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (193K ratings)](https://appshunter.io/ios/app/unit-converter-best-unit-app/id623691968/reviews)** | — |
| Number of ratings | **193K** | — |
| Positive reviews | 75.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#94** | — |
| Size | 13 MB | 27 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alan Mrvica](https://appshunter.io/developer/593306623) | [IVWorks](https://appshunter.io/developer/1653621222) |

## What reviewers say

### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-best-unit-app/id623691968)

**Currently charting:** #94 Top Grossing · Travel (US App Store)

Easily convert between a wide range of units across 20 categories, including length, weight, temperature, and more. Features live currency updates for 155 world currencies, refreshed daily. Designed for simplicity and visual appeal.

**Highlights:** 20 conversion categories, Live currency updates, 155 world currencies, Daily exchange rate refresh, Simple and beautiful design, Swap units functionality

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $3.99 | per month |
| Premium | $6.99 | per month |
| Premium | $24.99 | per year |
| Premium | $34.99 | per year |

**What reviewers like**

- 🚀 Easy to use
- 👍 Comprehensive conversions
- 💡 Useful for travel and cooking
- 🚀 Quick and efficient
- 👍 Intuitive interface

**What reviewers complain about**

- 🐛 Limited character input
- 🐛 Difficulty with negative numbers
- 💡 Lack of ability to quickly switch between conversions
- 💰 Pro version not worth the cost

**Reported bugs**

- Forced 5-star review prompt
- Inaccurate weight/stone conversion

**Requested features**

- Add calorie/kJ conversion
- Allow negative number input
- Improve ability to quickly switch between conversions


### Shred Instructor

[App page](https://appshunter.io/ios/app/shred-instructor/id6760658738)

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

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter free?

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

### Is Shred Instructor free?

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

### Do Unit Converter or Shred Instructor have ads?

Unit Converter shows ads; Shred Instructor does not.

### Which is updated more often, Unit Converter or Shred Instructor?

Unit Converter ships an update every 3 months, and Shred Instructor every 3 months. Most recently, Unit Converter was updated on October 20, 2026 and Shred Instructor on September 29, 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.*