Comparison

CalcMemo929 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

CalcMemo929

This app combines a simple calculator with note-taking capabilities, allowing users to solve math problems and save calculation processes as memos for easy reference. Its user-friendly interface and clear display enhance the learning and work experience.

Highlights
  • Intuitive user interface
  • Clear display of calculations
  • Save calculations as memos
  • Full-screen number display in landscape
  • Supports learning and work tasks
Features
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CalcMemo: Integrating Simple Calculations and Memos Innovatively CalcMemo is designed to make your calculations intuitive and efficient. By seamlessly integrating calculations with note-taking, CalcMemo aids users in solving mathematical problems and enriching their learning experience. With CalcMemo, take your calculating experience to the next level. [Key Features] A user-friendly interface that enables intuitive operation. Clear display that allows you to understand complex calculation processes at a glance. The ability to save calculation processes as memos for easy reference later. In landscape mode, the selected numbers can be displayed across the entire screen for easy detailed viewing. CalcMemo is here to support your learning and work. Give it a try, and you'll experience how it smoothens your calculation process.

About

Hardness Conversion Master

Features
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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

CalcMemo9293 screens
Hardness Conversion Master4 screens

Verdict

The call

The clearest difference is ads: CalcMemo929 at none against Hardness Conversion Master's shown. Hardness Conversion Master's advantage is update cadence (every 3 days vs every 2 weeks). On price, in-app purchases, 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. CalcMemo929 sells 1 one-off in-app purchase and Hardness Conversion Master sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

CalcMemo929 ships an update every 2 weeks, Hardness Conversion Master every 3 days. The most recent releases landed on October 4, 2026 and October 5, 2026 respectively.

Scorecard2 real differences ยท 6 level
CalcMemo929 versus Hardness Conversion Master: the parameters behind the verdict, then further details
ParameterCalcMemo929Hardness Conversion Master
PriceFreeFree
Positive reviews50.0% of reviewsโ€”
Update frequencyEvery 2 weeksEvery 3 days โ€” better
AdsNo โ€” betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesโ€”
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.4 โ€” better17.6
Further details โ€” not scored
Size1 MB259 MB
Age rating4+4+
DeveloperYOSHIHIRO TAKAHASHIPOYU WANG

In-app purchases

1 purchases

CalcMemo929

One-time1
  • Premium Plan$0.49
1 purchases

Hardness Conversion Master

One-time1
  • Unlock Pro$1.99

Questions

Is CalcMemo929 free?
CalcMemo929 is free to download, with in-app purchases available.
Is Hardness Conversion Master free?
Hardness Conversion Master is free to download, with in-app purchases available.
Do CalcMemo929 or Hardness Conversion Master have ads?
Hardness Conversion Master shows ads; CalcMemo929 does not.
Which is updated more often, CalcMemo929 or Hardness Conversion Master?
CalcMemo929 ships an update every 2 weeks, and Hardness Conversion Master every 3 days. Most recently, CalcMemo929 was updated on October 4, 2026 and Hardness Conversion Master on October 5, 2026.

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