# Unit Converter vs Simurelay

The clearest difference is rating: Unit Converter at 4.9 against Simurelay's 3.9. Unit Converter also leads on update cadence (weekly vs every 7 months). Simurelay's advantage is ads (none vs shown) and review sentiment (52% vs 25%). On price, ratings volume, in-app purchases and monetization model there is nothing between them.

Both are free to download. Unit Converter sells 10 in-app purchases, starting at $0.99 per 7 days and Simurelay sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Unit Converter holds the better App Store score, 4.9 against 3.9. Both are backed by a comparable volume of ratings — 7 and 17 respectively. Written reviews complicate that: 25% of Unit Converter's written reviews are positive against 52% of Simurelay's, so the app with the better star average is not the one people write more warmly about.

Unit Converter ships an update weekly, Simurelay every 7 months. The most recent releases landed on September 20, 2026 and August 1, 2026 respectively.

## The numbers

| Metric | Unit Converter | Simurelay |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (7 ratings)](https://appshunter.io/ios/app/unit-converter-science-tools/id1557454960/reviews)** | [3.9 (17 ratings)](https://appshunter.io/ios/app/simurelay/id1580180864/reviews) |
| Number of ratings | 7 | **17** |
| Positive reviews | 25.0% of reviews | **52.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 7 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 19 MB | 19 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Eugene Kugut](https://appshunter.io/developer/1557454962) | [Abdessamed Benkabouya](https://appshunter.io/developer/1580180866) |

## What reviewers say

### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-science-tools/id1557454960)

This app offers over 30 unit converters for science, engineering, and everyday use. It features advanced options like adjustable rounding, smart search, and calculation history, with customizable themes and an iPad-optimized interface.

**Highlights:** Over 30 unit converters, Adjustable rounding, Smart search by name or units, Copy/paste values, Swap units with one button, Calculation history, Customizable themes

**Features:** Family Sharing

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium access | $0.99 | per 7 days |
| Premium access | $0.99 | per month |
| Premium access | $1.99 | per 7 days |
| Premium access | $1.99 | per month |
| Premium access | $2.99 | per month |
| Premium access | $8.99 | per year |
| Premium access | $9.99 | per year |
| Premium access | $17.99 | per year |
| Premium access | $19.99 | per year |
| Premium access | $44.99 | one-time |


### Simurelay

[App page](https://appshunter.io/ios/app/simurelay/id1580180864)

Design and simulate electromechanical systems with a wide range of basic electrical components. Create detailed electrical diagrams using relays, switches, buttons, contactors, and timers.

**Highlights:** Design electromechanical systems, Simulate electrical diagrams, Basic electrical components library, Relays, switches, buttons, contactors, Timers and motors simulation

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Timers Coils and Contacts | $7.99 | one-time |
| Advanced Tools | $7.99 | one-time |
| Full Version | $14.99 | one-time |


## Frequently asked questions

### Is Unit Converter free?

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

### Is Simurelay free?

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

### Which has better reviews, Unit Converter or Simurelay?

Unit Converter is rated higher. Unit Converter averages 4.9 out of 5 from 7 ratings, while Simurelay averages 3.9 from 17 ratings.

### Do Unit Converter or Simurelay have ads?

Unit Converter shows ads; Simurelay does not.

### Which is updated more often, Unit Converter or Simurelay?

Unit Converter ships an update weekly, and Simurelay every 7 months. Most recently, Unit Converter was updated on September 20, 2026 and Simurelay on August 1, 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.*