# SWF X vs Calculus

The clearest difference is update cadence: SWF X at every 5 weeks against Calculus's every 38 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SWF X ships an update every 5 weeks, Calculus every 38 months. The most recent releases landed on August 12, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | SWF X | Calculus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 38 months |
| Size | 49 MB | 66 MB |
| Requires iOS | 15.1 | **14.2** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [SWF Krantechnik GmbH](https://appshunter.io/developer/1494895161) | [Calculus](https://appshunter.io/developer/1500439589) |

## What reviewers say

### SWF X

[App page](https://appshunter.io/ios/app/swf-x-link/id1494895162)

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

**In-app purchases:** none


### Calculus

[App page](https://appshunter.io/ios/app/calculus-field-tool/id1500439590)

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

**In-app purchases:** none


## Frequently asked questions

### Is SWF X free?

SWF X is free to download, with no in-app purchases.

### Is Calculus free?

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

### Do SWF X or Calculus have ads?

Neither SWF X nor Calculus shows ads.

### Which is updated more often, SWF X or Calculus?

SWF X ships an update every 5 weeks, and Calculus every 38 months. Most recently, SWF X was updated on August 12, 2026 and Calculus on September 7, 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.*