Tremai LED vs Hardness Conversion Master
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tremai LED
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An APP only use for iphone to control the led display.
Hardness Conversion Master
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A professional hardness conversion tool designed for mechanical engineering, metal heat treatment, and quality management, providing quick, stable, and traceable engineering reference data. **Key Features** 1. **Industrial-Grade Precision** The conversion logic is based on ASTM E140 / ASTM A370 standards, utilizing high-density reference points and linear interpolation to deliver stable and reproducible conversion results. 2. **Flexible Input and Real-Time Synchronization** Allows direct input in any hardness field (e.g., HRC / HV / HBW), with real-time conversion across other units, enhancing on-site operational efficiency. 3. **Physical Range Protection Mechanism** Built-in effective range checks for each scale, displaying "No Reference Value" when out of range, reducing the risk of misinterpretation. 4. **Customizable Interface** Enables toggling unit displays and drag-and-drop sorting to create a workspace tailored to individual or production line processes. 5. **Image Conversion (Beta)** Supports photo/album import, area selection recognition, result comparison, and manual correction, suitable for quick conversion of reports and on-site records. 6. **Batch Conversion** Allows multiple data entries for rapid conversion, retaining the last used unit preference to minimize repetitive actions. **Supported Units** - Rockwell: HRC, HRA, HRB, HRD, HRF - Superficial Rockwell: HR15N, HR30N, HR45N, HR15T, HR30T, HR45T - Brinell: HB, HBW - Vickers: HV - Tensile Strength: MPa
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Tremai LED | Hardness Conversion Master |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 2 MB | 259 MB |
| Age rating | 4+ | 4+ |
| Developer | Shenzhen Panels Elec. Co., Ltd. | POYU WANG |
In-app purchases
Tremai LED
No in-app purchases
Hardness Conversion Master
- Unlock Pro$1.99
Questions
Is Tremai LED free?
Is Hardness Conversion Master free?
Do Tremai LED or Hardness Conversion Master have ads?
Which is updated more often, Tremai LED or Hardness Conversion Master?
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