# Quick Conversion Units vs MeloLingo

The clearest difference is review sentiment: Quick Conversion Units at 100% against MeloLingo's 25%. Quick Conversion Units also leads on in-app purchases (none vs 6) and rating (5.0 vs 4.6). MeloLingo's advantage is price (Free vs $4.99) and update cadence (every 5 days vs every 44 months). On ads and device support there is nothing between them.

MeloLingo is free to download; Quick Conversion Units costs $4.99 up front. MeloLingo sells 6 in-app purchases, starting at $6.99 per 7 days. Quick Conversion Units asks for nothing beyond the download.

Quick Conversion Units holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: MeloLingo has 71 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Quick Conversion Units's written reviews are positive against 25% of MeloLingo's.

Quick Conversion Units ships an update every 44 months, MeloLingo every 5 days. The most recent releases landed on September 29, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Quick Conversion Units | MeloLingo |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/quick-conversion-units/id1159050734/reviews)** | [4.6 (71 ratings)](https://appshunter.io/ios/app/melolingo-learn-spanish/id6757321559/reviews) |
| Number of ratings | 1 | **71** |
| Positive reviews | **100.0% of reviews** | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 44 months | **Every 5 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | — | **#118** |
| Size | 32 MB | 244 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [bader alshammari](https://appshunter.io/developer/858126240) | [Wojciech Zieba](https://appshunter.io/developer/1853276764) |

## What reviewers say

### Quick Conversion Units

[App page](https://appshunter.io/ios/app/quick-conversion-units/id1159050734)

This app offers a streamlined conversion experience for oilfield professionals. It provides over 1000 conversion types across 19 categories, all accessible on a single screen for maximum efficiency and accuracy.

**Highlights:** Single-screen conversions, 19 conversion categories, 1000+ conversion types, Oilfield specific units, Increases productivity, Enhances accuracy

**Features:** macOS Compatibility

**In-app purchases:** none


### MeloLingo

[App page](https://appshunter.io/ios/app/melolingo-learn-spanish/id6757321559)

**Currently charting:** #118 Top Grossing · Education (US App Store)

Learn Spanish by singing along to popular songs with real-time lyrics and translations. This app uses music to make vocabulary stick naturally, offering quizzes and slang cards for practical language acquisition. It's designed for beginners and helps build a daily learning habit.

**Highlights:** Karaoke-style lyrics with line-by-line highlighting, Tap-to-translate for instant English definitions, Vocabulary quizzes after each song, Adjustable playback speed, Slang & Street Spanish cards, Daily streak tracking

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $6.99 | per 7 days |
| Premium Monthly | $9.99 | per month |
| Premium Yearly | $39.99 | per year |
| MeloLingo Pro | $39.99 | per year |
| MeloLingo Pro | $39.99 | per year |
| Lifetime Pro Access | $14.99 | one-time |


## Frequently asked questions

### Is Quick Conversion Units free?

Quick Conversion Units costs $4.99, with no in-app purchases.

### Is MeloLingo free?

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

### Which has better reviews, Quick Conversion Units or MeloLingo?

Quick Conversion Units is rated higher. Quick Conversion Units averages 5.0 out of 5 from 1 ratings, while MeloLingo averages 4.6 from 71 ratings.

### Do Quick Conversion Units or MeloLingo have ads?

Neither Quick Conversion Units nor MeloLingo shows ads.

### Which is updated more often, Quick Conversion Units or MeloLingo?

Quick Conversion Units ships an update every 44 months, and MeloLingo every 5 days. Most recently, Quick Conversion Units was updated on September 29, 2026 and MeloLingo on October 15, 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.*