# Smart Construction Quick3D vs Keisan Memo

The clearest difference is in-app purchases: Smart Construction Quick3D at none against Keisan Memo's 1. Smart Construction Quick3D also leads on ads (none vs shown) and device support (3 vs 1). Keisan Memo's advantage is update cadence (weekly vs monthly). On price there is nothing between them.

Both are free to download. Keisan Memo sells 1 one-off in-app purchase. Smart Construction Quick3D asks for nothing beyond the download.

Smart Construction Quick3D ships an update monthly, Keisan Memo weekly. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Smart Construction Quick3D | Keisan Memo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Weekly** |
| Size | 39 MB | 5 MB |
| Requires iOS | **15.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [EARTHBRAIN Ltd.](https://appshunter.io/developer/1392320623) | [丽佳 施](https://appshunter.io/developer/1894580777) |

## What reviewers say

### Smart Construction Quick3D

[App page](https://appshunter.io/ios/app/smart-construction-quick3d/id1627645913)

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

**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 Smart Construction Quick3D free?

Smart Construction Quick3D 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 Smart Construction Quick3D or Keisan Memo have ads?

Keisan Memo shows ads; Smart Construction Quick3D does not.

### Which is updated more often, Smart Construction Quick3D or Keisan Memo?

Smart Construction Quick3D ships an update monthly, and Keisan Memo weekly. Most recently, Smart Construction Quick3D was updated on October 30, 2026 and Keisan Memo on October 24, 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.*