# FlowLine Isometric vs SM Offset

The clearest difference is ads: FlowLine Isometric at none against SM Offset's shown. FlowLine Isometric also leads on monetization model (free vs ad-supported) and ratings volume (11 vs 2). SM Offset's advantage is update cadence (every 2 weeks vs every 6 weeks) and iOS requirement (15.0 vs 26.0). On price, rating, 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.

On the App Store both sit at effectively the same score — 4.0 for FlowLine Isometric against 4.0 for SM Offset. That said, the two scores are not equally well evidenced: FlowLine Isometric has 11 ratings behind it against 2, so its average is the more settled of the two.

FlowLine Isometric ships an update every 6 weeks, SM Offset every 2 weeks. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | FlowLine Isometric | SM Offset |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (11 ratings)](https://appshunter.io/ios/app/flowline-isometric/id6762237039/reviews) | [4.0 (2 ratings)](https://appshunter.io/ios/app/sm-offset-duct-calculator/id6781870096/reviews) |
| Number of ratings | **11** | 2 |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 23 MB | 6 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Joshua Parkin](https://appshunter.io/developer/1495725832) | [Bradley Evans](https://appshunter.io/developer/6781870098) |

## What reviewers say

### FlowLine Isometric

[App page](https://appshunter.io/ios/app/flowline-isometric/id6762237039)

A professional tool for creating isometric piping diagrams. It allows pipefitters, plumbers, engineers, and contractors to quickly sketch and document pipe runs with a snap grid for precise isometric projection.

**Highlights:** Isometric projection drawing, Snap grid for precise lines, Quick sketching and documentation, On-site or office use, Focus on layout

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

**In-app purchases:** none


### 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 FlowLine Isometric free?

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

### Is SM Offset free?

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

### Which has better reviews, FlowLine Isometric or SM Offset?

FlowLine Isometric and SM Offset are both rated 4.0 out of 5 on the App Store, from 11 and 2 ratings respectively.

### Do FlowLine Isometric or SM Offset have ads?

SM Offset shows ads; FlowLine Isometric does not.

### Which is updated more often, FlowLine Isometric or SM Offset?

FlowLine Isometric ships an update every 6 weeks, and SM Offset every 2 weeks. Most recently, FlowLine Isometric was updated on October 31, 2026 and SM Offset on November 5, 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.*