# Tremai LED vs Hardness Conversion Master

The clearest difference is in-app purchases: Tremai LED at none against Hardness Conversion Master's 1. Tremai LED also leads on ads (none vs shown) and iOS requirement (9.0 vs 17.6). Hardness Conversion Master's advantage is update cadence (every 3 days vs every 3 months). On price and device support there is nothing between them.

Both are free to download. Hardness Conversion Master sells 1 one-off in-app purchase. Tremai LED asks for nothing beyond the download.

Tremai LED ships an update every 3 months, Hardness Conversion Master every 3 days. The most recent releases landed on October 26, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Tremai LED | Hardness Conversion Master |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 days** |
| Size | 2 MB | 259 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Panels Elec. Co., Ltd.](https://appshunter.io/developer/1495014214) | [POYU WANG](https://appshunter.io/developer/1883764660) |

## What reviewers say

### Tremai LED

[App page](https://appshunter.io/ios/app/tremai-led/id1495014215)

**Features:** macOS Compatibility

**In-app purchases:** none


### Hardness Conversion Master

[App page](https://appshunter.io/ios/app/hardness-conversion-master/id6760411989)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro | $1.99 | one-time |


## Frequently asked questions

### Is Tremai LED free?

Tremai LED is free to download, with no in-app purchases.

### Is Hardness Conversion Master free?

Hardness Conversion Master is free to download, with in-app purchases available.

### Do Tremai LED or Hardness Conversion Master have ads?

Hardness Conversion Master shows ads; Tremai LED does not.

### Which is updated more often, Tremai LED or Hardness Conversion Master?

Tremai LED ships an update every 3 months, and Hardness Conversion Master every 3 days. Most recently, Tremai LED was updated on October 26, 2026 and Hardness Conversion Master on October 31, 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.*