# Right Calculator vs Span64

The clearest difference is in-app purchases: Right Calculator at none against Span64's 1. Right Calculator also leads on iOS requirement (15.1 vs 18.0). Span64's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Span64 sells 1 one-off in-app purchase. Right Calculator asks for nothing beyond the download.

Right Calculator ships an update every 6 days, Span64 weekly. The most recent releases landed on October 7, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Right Calculator | Span64 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 6 days** | Weekly |
| Size | 41 MB | 30 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Megabyte Software Inc.](https://appshunter.io/developer/1143972928) | [Roberto Garrido](https://appshunter.io/developer/943471024) |

## What reviewers say

### Right Calculator

[App page](https://appshunter.io/ios/app/right-calculator/id6768528621)

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

**In-app purchases:** none


### Span64

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

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is Right Calculator free?

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

### Is Span64 free?

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

### Do Right Calculator or Span64 have ads?

Right Calculator shows ads; Span64 does not.

### Which is updated more often, Right Calculator or Span64?

Right Calculator ships an update every 6 days, and Span64 weekly. Most recently, Right Calculator was updated on October 7, 2026 and Span64 on October 4, 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.*