# Note by Xi vs STRUCT Construction Calculator

The clearest difference is price: STRUCT Construction Calculator at Free against Note by Xi's $0.99. STRUCT Construction Calculator also leads on iOS requirement (13.0 vs 17.6). Note by Xi's advantage is update cadence (every 8 days vs every 4 months). On ads, in-app purchases and device support there is nothing between them.

STRUCT Construction Calculator is free to download; Note by Xi costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Note by Xi ships an update every 8 days, STRUCT Construction Calculator every 4 months. The most recent releases landed on October 2, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Note by Xi | STRUCT Construction Calculator |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 4 months |
| Size | 56 MB | 16 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [鉴 郗](https://appshunter.io/developer/559961494) | [MOBILEXAPPS MB](https://appshunter.io/developer/1685170475) |

## What reviewers say

### Note by Xi

[App page](https://appshunter.io/ios/app/note-by-xi-the-cleanest-note/id6757339447)

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

**In-app purchases:** none


### STRUCT Construction Calculator

[App page](https://appshunter.io/ios/app/struct-construction-calculator/id6758335610)

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

**In-app purchases:** none


## Frequently asked questions

### Is Note by Xi free?

Note by Xi costs $0.99, with no in-app purchases.

### Is STRUCT Construction Calculator free?

STRUCT Construction Calculator is free to download, with no in-app purchases.

### Do Note by Xi or STRUCT Construction Calculator have ads?

Neither Note by Xi nor STRUCT Construction Calculator shows ads.

### Which is updated more often, Note by Xi or STRUCT Construction Calculator?

Note by Xi ships an update every 8 days, and STRUCT Construction Calculator every 4 months. Most recently, Note by Xi was updated on October 2, 2026 and STRUCT Construction Calculator on September 25, 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.*