# CalcMemo929 vs Hardness Conversion Master

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.

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.

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.

## The numbers

| Metric | CalcMemo929 | Hardness Conversion Master |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 259 MB |
| Requires iOS | **16.4** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YOSHIHIRO TAKAHASHI](https://appshunter.io/developer/574193873) | [POYU WANG](https://appshunter.io/developer/1883764660) |

## What reviewers say

### CalcMemo929

[App page](https://appshunter.io/ios/app/calcmemo929/id6451918962)

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:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan | $0.49 | one-time |


### Hardness Conversion Master

[App page](https://appshunter.io/ios/app/hardness-conversion-master/id6760411989)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro | $1.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*