# Conversion Calculator Units vs Spell Check

The clearest difference is review sentiment: Conversion Calculator Units at 82% against Spell Check's 35%. Conversion Calculator Units also leads on rating (4.7 vs 4.4) and ratings volume (5K vs 547). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Conversion Calculator Units sells 1 one-off in-app purchase and Spell Check sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Conversion Calculator Units holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Conversion Calculator Units has 5K ratings behind it against 547, so its average is the more settled of the two. Written reviews point the same way: 82% of Conversion Calculator Units's written reviews are positive against 35% of Spell Check's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Conversion Calculator Units | Spell Check |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (5K ratings)](https://appshunter.io/ios/app/conversion-calculator-units/id727632233/reviews)** | [4.4 (547 ratings)](https://appshunter.io/ios/app/spell-check-spellwise/id1538292887/reviews) |
| Number of ratings | **5K** | 547 |
| Positive reviews | **82.1% of reviews** | 35.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 41 MB | 20 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RV AppStudios LLC](https://appshunter.io/developer/340181308) | [Senol Cagir](https://appshunter.io/developer/1240140029) |

## What reviewers say

### Conversion Calculator Units

[App page](https://appshunter.io/ios/app/conversion-calculator-units/id727632233)

This app offers a simple and powerful way to convert between over 140 units across 12 categories. Easily switch between units, customize your experience with themes, and share your results.

**Highlights:** Converts over 140 units, Supports 12 conversion categories, Customizable themes, Drag and set unit positions, Add units to favorites, Share converted units via email

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

- 👍 User-friendly
- 🚀 Easy to use
- 💡 Helpful for learning metric system
- 👍 Great for conversions
- 👍 Intuitive interface

**What reviewers complain about**

- 🐛 Ads disrupt usage
- 🐛 Difficult to change units
- 🐛 Lacks portrait mode
- 🐛 Upside-down orientation issues
- 🐛 Cluttered UI design

**Reported bugs**

- Ads not removed after purchase
- Incorrect unit conversions

**Requested features**

- Add pressure conversion units
- Include a basic calculator function
- Implement multi-language support
- Allow customization of unit order


### Spell Check

[App page](https://appshunter.io/ios/app/spell-check-spellwise/id1538292887)

This AI-powered tool enhances your writing by correcting spelling and grammar errors across numerous languages. It offers features like text-to-speech, translation, summarization, and style transformation to refine your content for any audience.

**Highlights:** AI-powered spelling and grammar check, Text-to-Speech functionality, Multi-language translation, Text summarization, Intelligent text completion, Style and tone adjustment, Readability and sentiment analysis

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Subscription Group | $1.99 | per 7 days |
| Pro Subscription Group | $4.99 | per month |
| Pro Subscription Group | $34.99 | per year |


## Frequently asked questions

### Is Conversion Calculator Units free?

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

### Is Spell Check free?

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

### Which has better reviews, Conversion Calculator Units or Spell Check?

Conversion Calculator Units is rated higher. Conversion Calculator Units averages 4.7 out of 5 from 5K ratings, while Spell Check averages 4.4 from 547 ratings.

### Do Conversion Calculator Units or Spell Check have ads?

Both Conversion Calculator Units and Spell Check show ads.

### Which is updated more often, Conversion Calculator Units or Spell Check?

Conversion Calculator Units ships an update every 2 months, and Spell Check every 2 months. Most recently, Conversion Calculator Units was updated on October 17, 2026 and Spell Check on October 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*