Comparison

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.

Head to head
About

Resistor color decoder

Features
Read full description

App that let you calculate theoretical resistance from resistor color code and real tolerance resistance range.

About

Hardness Conversion Master

Features
Read full description

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

Resistor color decoder1 screens
Hardness Conversion Master4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

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.

Scorecard2 real differences ยท 4 level
Resistor color decoder versus Hardness Conversion Master: the parameters behind the verdict, then further details
ParameterResistor color decoderHardness Conversion Master
PriceFreeFree
Update frequencyEvery 9 daysEvery 3 days โ€” better
AdsYesYes
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 โ€” better17.6
Further details โ€” not scored
Size6 MB259 MB
Age rating4+4+
DeveloperMichal PajdakPOYU WANG

In-app purchases

None

Resistor color decoder

No in-app purchases

1 purchases

Hardness Conversion Master

One-time1
  • Unlock Pro$1.99

Questions

Is Resistor color decoder free?
Resistor color decoder 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 Resistor color decoder or Hardness Conversion Master have ads?
Both Resistor color decoder and Hardness Conversion Master show ads.
Which is updated more often, Resistor color decoder or Hardness Conversion Master?
Resistor color decoder ships an update every 9 days, and Hardness Conversion Master every 3 days. Most recently, Resistor color decoder was updated on October 16, 2026 and Hardness Conversion Master on October 5, 2026.

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