# Calculator Classic Basic vs Keisan Memo

The clearest difference is in-app purchases: Calculator Classic Basic at none against Keisan Memo's 1. Calculator Classic Basic also leads on device support (3 vs 1) and iOS requirement (15.6 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Keisan Memo sells 1 one-off in-app purchase. Calculator Classic Basic asks for nothing beyond the download.

Calculator Classic Basic ships an update every 5 days, Keisan Memo weekly. The most recent releases landed on September 11, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Calculator Classic Basic | Keisan Memo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 5 days** | Weekly |
| Size | 4 MB | 5 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Matrix Software Co.](https://appshunter.io/developer/1457004046) | [丽佳 施](https://appshunter.io/developer/1894580777) |

## What reviewers say

### Calculator Classic Basic

[App page](https://appshunter.io/ios/app/calculator-classic-basic/id6745878564)

**Features:** macOS Compatibility

**In-app purchases:** none


### Keisan Memo

[App page](https://appshunter.io/ios/app/keisan-memo-calc-notepad/id6791201696)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads (Lifetime) | $0.99 | one-time |


## Frequently asked questions

### Is Calculator Classic Basic free?

Calculator Classic Basic is free to download, with no in-app purchases.

### Is Keisan Memo free?

Keisan Memo is free to download, with in-app purchases available.

### Do Calculator Classic Basic or Keisan Memo have ads?

Both Calculator Classic Basic and Keisan Memo show ads.

### Which is updated more often, Calculator Classic Basic or Keisan Memo?

Calculator Classic Basic ships an update every 5 days, and Keisan Memo weekly. Most recently, Calculator Classic Basic was updated on September 11, 2026 and Keisan Memo on September 17, 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.*