网络预付费 vs Hardness Conversion Master
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
网络预付费
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网络预付费方便高校、商业综合体完成能源管理工作,协助物业提高工作效率。
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: 网络预付费 at none against Hardness Conversion Master's 1. 网络预付费 also leads on ads (none vs shown) and iOS requirement (11.0 vs 17.6). Hardness Conversion Master's advantage is update cadence (every 3 days vs every 14 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. 网络预付费 asks for nothing beyond the download.
网络预付费 ships an update every 14 months, Hardness Conversion Master every 3 days. The most recent releases landed on September 10, 2026 and August 31, 2026 respectively.
| Parameter | 网络预付费 | Hardness Conversion Master |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 14 months | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 11.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 18 MB | 259 MB |
| Age rating | 4+ | 4+ |
| Developer | 珠海派诺科技股份有限公司 | POYU WANG |
In-app purchases
网络预付费
No in-app purchases
Hardness Conversion Master
- Unlock Pro$1.99





