Resistor color decoder vs Hardness Conversion Master
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Resistor color decoder
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App that let you calculate theoretical resistance from resistor color code and real tolerance resistance range.
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: Resistor color decoder at none against Hardness Conversion Master's 1. Hardness Conversion Master's advantage is update cadence (every 3 days vs every 9 days). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Hardness Conversion Master sells 1 one-off in-app purchase. Resistor color decoder asks for nothing beyond the download.
Resistor color decoder ships an update every 9 days, Hardness Conversion Master every 3 days. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.
| Parameter | Resistor color decoder | Hardness Conversion Master |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 days | Every 3 days โ better |
| Ads | Yes | Yes |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 โ better | 17.6 |
| Further details โ not scored | ||
| Size | 6 MB | 259 MB |
| Age rating | 4+ | 4+ |
| Developer | Michal Pajdak | POYU WANG |
In-app purchases
Resistor color decoder
No in-app purchases
Hardness Conversion Master
- Unlock Pro$1.99
Questions
Is Resistor color decoder free?
Is Hardness Conversion Master free?
Do Resistor color decoder or Hardness Conversion Master have ads?
Which is updated more often, Resistor color decoder or Hardness Conversion Master?
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