# Metric Conversion tool vs Thread Length Calculator

The clearest difference is review sentiment: Thread Length Calculator at 100% against Metric Conversion tool's 70%. Thread Length Calculator also leads on rating (5.0 vs 4.8) and iOS requirement (13.0 vs 15.1). Metric Conversion tool's advantage is ratings volume (15K vs 3). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Thread Length Calculator holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Metric Conversion tool has 15K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 70% of Metric Conversion tool's written reviews are positive against 100% of Thread Length Calculator's.

Both ship on a similar rhythm, roughly every 10 days. The most recent releases landed on October 12, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Metric Conversion tool | Thread Length Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (15K ratings)](https://appshunter.io/ios/app/metric-conversion-tool/id1439430070/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/thread-length-calculator/id6458585044/reviews)** |
| Number of ratings | **15K** | 3 |
| Positive reviews | 70.2% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | Every 10 days |
| Monetization | Free | Free |
| Size | 22 MB | 11 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wight Hat](https://appshunter.io/developer/1425885740) | [Nigel Armitage](https://appshunter.io/developer/1834117685) |

## What reviewers say

### Metric Conversion tool

[App page](https://appshunter.io/ios/app/metric-conversion-tool/id1439430070)

This app provides a comprehensive unit and currency converter with a user-friendly interface. It offers offline functionality, supports over 30,000 unit conversions, and includes more than 160 currencies with live exchange rates. Users can save favorite conversions and get precise results.

**Highlights:** Offline functionality, Over 30,000 unit conversions, 160+ currencies with live rates, Save favorite conversions, Answers in fractions, Up to 5 decimal places

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

**In-app purchases:** none

**What reviewers like**

- 💡 Useful conversion tool
- 👍 Easy to use and navigate
- 🚀 Quick and efficient
- 👍 Comprehensive coverage of conversions

**What reviewers complain about**

- 🔊 Intrusive and loud ads
- 🔒 Questionable privacy practices
- 🐛 Inaccurate conversions
- 👎 Disruptive to workflow

**Reported bugs**

- Temperature conversion displaying incorrect values
- Ads triggering false memory full warnings

**Requested features**

- Paid version to remove ads
- Option to display results in preferred format
- Speed conversion (mph, km/h, etc.)


### Thread Length Calculator

[App page](https://appshunter.io/ios/app/thread-length-calculator/id6458585044)

This free tool helps leatherworkers accurately calculate the thread length required for their projects. It accounts for the number of holes, stitching length, and leather thickness, ensuring you always have enough material.

**Highlights:** Thread length calculation, Supports any number of holes, Accounts for stitching length, Considers leather thickness, Free to use

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

**In-app purchases:** none


## Frequently asked questions

### Is Metric Conversion tool free?

Metric Conversion tool is free to download, with no in-app purchases.

### Is Thread Length Calculator free?

Thread Length Calculator is free to download, with no in-app purchases.

### Which has better reviews, Metric Conversion tool or Thread Length Calculator?

Thread Length Calculator is rated higher. Metric Conversion tool averages 4.8 out of 5 from 15K ratings, while Thread Length Calculator averages 5.0 from 3 ratings.

### Do Metric Conversion tool or Thread Length Calculator have ads?

Neither Metric Conversion tool nor Thread Length Calculator shows ads.

### Which is updated more often, Metric Conversion tool or Thread Length Calculator?

Metric Conversion tool ships an update every 10 days, and Thread Length Calculator every 10 days. Most recently, Metric Conversion tool was updated on October 12, 2026 and Thread Length Calculator on September 30, 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.*