# Span64 Construction Calculator vs Chalk

The clearest difference is update cadence: Span64 Construction Calculator at weekly against Chalk's every 3 months. Span64 Construction Calculator also leads on iOS requirement (18.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Span64 Construction Calculator sells 1 one-off in-app purchase and Chalk sells 2 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Span64 Construction Calculator ships an update weekly, Chalk every 3 months. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Span64 Construction Calculator | Chalk |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/chalk-construction-calculator/id6790033351/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | — | Free with in-app purchases |
| Size | 29 MB | 18 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Roberto Garrido](https://appshunter.io/developer/943471024) | [Lionary LLC](https://appshunter.io/developer/1049490654) |

## What reviewers say

### Span64 Construction Calculator

[App page](https://appshunter.io/ios/app/span64-construction-calculator/id6789300863)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Span64 Pro | $19.99 | one-time |


### Chalk

[App page](https://appshunter.io/ios/app/chalk-construction-calculator/id6790033351)

This construction calculator handles metric and imperial units seamlessly, offering specialized tools for various trades like framing, tiling, and concrete work. It features an AI advisor for job guidance and works offline, ensuring accessibility on any job site.

**Highlights:** Metric and imperial unit support, Specialized trade calculators (stairs, rafters, concrete, etc.), AI Advisor for job guidance, Offline functionality, Adjustable fraction precision, Saved projects

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chalk Pro Weekly | $2.99 | per 7 days |
| Chalk Pro Yearly | $17.99 | per year |


## Frequently asked questions

### Is Span64 Construction Calculator free?

Span64 Construction Calculator is free to download, with in-app purchases available.

### Is Chalk free?

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

### Do Span64 Construction Calculator or Chalk have ads?

Neither Span64 Construction Calculator nor Chalk shows ads.

### Which is updated more often, Span64 Construction Calculator or Chalk?

Span64 Construction Calculator ships an update weekly, and Chalk every 3 months. Most recently, Span64 Construction Calculator was updated on October 28, 2026 and Chalk on October 31, 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.*