Comparison

Hardness Conversion Master vs NDT Master

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
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

About

NDT Master

This app streamlines ultrasonic testing for field inspections. It offers rapid weld rating, DAC/TCG curve building, 3D beam simulation, and OCR parameter capture. Includes essential UT calculators and material presets for efficient flaw detection and setup confidence.

Highlights
  • AWS D-Rating in 5 Seconds
  • DAC/TCG Curve Building
  • 3D Beam Simulation
  • OCR Parameter Capture
  • 9 UT Calculators
  • Offline-First Workflow
Features
Read full description

NDT Master is built for field ultrasonic testing workflows. It brings AWS D-Rating, DAC/TCG curve building, 3D beam simulation, OCR parameter capture, and practical UT calculators into one offline-first app. Core field workflows - AWS D-Rating in 5 Seconds: Fast weld indication workflow for field UT - Build DAC/TCG Curves Fast: Plot reference echoes and gain table instantly - Scan Readings. Auto-Fill Parameters.: OCR maps velocity, MHz and dB in seconds - Locate Flaws Faster: Instant depth and projection outputs - Critical Angles at a Glance: Snell + beam spread for setup confidence - Beam Spread You Can Trust: Visualize setup impact before inspection starts Tools included - 9 UT calculators: Wavelength, Near Field, Beam Spread, Flaw Location, Snell's Law, ToFD PCS, dB Calc, Acoustic Impedance, Resonance. - Material presets for steel, aluminum, stainless steel, and common inspection setup. - Code-aware workflows for weld inspection decisions, with AWS and ASME terminology kept visible. Offline and private - Built for Real Field Work: Local data, no account, offline-first workflow

Screenshots

Hardness Conversion Master4 screens
NDT Master4 screens

Verdict

The call

The clearest difference is ads: NDT Master at none against Hardness Conversion Master's shown. NDT Master also leads on iOS requirement (15 vs 17.6). Hardness Conversion Master's advantage is update cadence (every 3 days vs every 2 weeks). On price, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Hardness Conversion Master sells 1 one-off in-app purchase and NDT Master sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Hardness Conversion Master ships an update every 3 days, NDT Master every 2 weeks. The most recent releases landed on October 22, 2026 and October 25, 2026 respectively.

Scorecard3 real differences · 7 level
Hardness Conversion Master versus NDT Master: the parameters behind the verdict, then further details
ParameterHardness Conversion MasterNDT Master
PriceFreeFree
Rating—3.0 (2 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 3 days — betterEvery 2 weeks
AdsYesNo — better
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.615 — better
Further details — not scored
Size259 MB20 MB
Age rating4+4+
DeveloperPOYU WANG雪 蔺

In-app purchases

1 purchases

Hardness Conversion Master

One-time1
  • Unlock Pro$1.99
1 purchases

NDT Master

One-time1
  • Professional Unlock$9.99

Questions

Is Hardness Conversion Master free?
Hardness Conversion Master is free to download, with in-app purchases available.
Is NDT Master free?
NDT Master is free to download, with in-app purchases available.
Do Hardness Conversion Master or NDT Master have ads?
Hardness Conversion Master shows ads; NDT Master does not.
Which is updated more often, Hardness Conversion Master or NDT Master?
Hardness Conversion Master ships an update every 3 days, and NDT Master every 2 weeks. Most recently, Hardness Conversion Master was updated on October 22, 2026 and NDT Master on October 25, 2026.

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