# FabCalc vs SM Offset

The clearest difference is in-app purchases: SM Offset at none against FabCalc's 4. FabCalc's advantage is ads (none vs shown) and update cadence (weekly vs every 2 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. FabCalc sells 4 in-app purchases, starting at $4.99 per month. SM Offset asks for nothing beyond the download.

FabCalc ships an update weekly, SM Offset every 2 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | FabCalc | SM Offset |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sm-offset-duct-calculator/id6781870096/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | — | Ad-supported |
| Size | 3 MB | 6 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Double Vision USA LLC](https://appshunter.io/developer/1894678139) | [Bradley Evans](https://appshunter.io/developer/6781870098) |

## What reviewers say

### FabCalc

[App page](https://appshunter.io/ios/app/fabcalc-flat-pattern-dxf/id6781708798)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FabCalc Pro Monthly | $4.99 | per month |
| FabCalc Pro Yearly | $29.99 | per year |
| Fab Shop Bundle | $119.99 | one-time |
| ShopCalc Pro Lifetime | $129.99 | one-time |


### SM Offset

[App page](https://appshunter.io/ios/app/sm-offset-duct-calculator/id6781870096)

This utility app provides precise offset calculations for sheet metal workers, HVAC fabricators, and pipefitters. It offers real tape-measure fractions for cut lengths, arc lengths, and elbow centerlines, working entirely offline for jobsite reliability.

**Highlights:** Two-elbow offset calculations, Rolling offset calculations, Duct fitting offsets, Custom angle support, Results in real fractions, 100% offline functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is FabCalc free?

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

### Is SM Offset free?

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

### Do FabCalc or SM Offset have ads?

SM Offset shows ads; FabCalc does not.

### Which is updated more often, FabCalc or SM Offset?

FabCalc ships an update weekly, and SM Offset every 2 weeks. Most recently, FabCalc was updated on October 25, 2026 and SM Offset on October 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.*