# Blair Absolute Solutions vs Digiduct

The clearest difference is update cadence: Digiduct at every 2 months against Blair Absolute Solutions's every 27 months. Blair Absolute Solutions's advantage is iOS requirement (15.1 vs 26.2). 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.

Blair Absolute Solutions ships an update every 27 months, Digiduct every 2 months. The most recent releases landed on October 5, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Blair Absolute Solutions | Digiduct |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (11 ratings)](https://appshunter.io/ios/app/digiduct/id6738926359/reviews)** |
| Number of ratings | — | **11** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 2 months** |
| Monetization | — | Ad-supported |
| Size | 14 MB | 4 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Grub Market Inc.](https://appshunter.io/developer/961362132) | [Syska Hennessy Group](https://appshunter.io/developer/1782943081) |

## What reviewers say

### Blair Absolute Solutions

[App page](https://appshunter.io/ios/app/blair-absolute-solutions/id1615689278)

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

**In-app purchases:** none


### Digiduct

[App page](https://appshunter.io/ios/app/digiduct/id6738926359)

This HVAC tool assists professionals with duct sizing calculations based on ASHRAE standards. It supports multiple duct shapes and offers intelligent features to ensure accurate and reliable designs for real-world scenarios.

**Highlights:** Duct sizing for rectangular, round, and flat oval ducts, Customizable dimensions with locked values, Duct location intelligence for context-aware sizing, Calculations based on CFM, pressure drop, or velocity, Alerts for exceeding pressure drop or velocity limits

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

**In-app purchases:** none


## Frequently asked questions

### Is Blair Absolute Solutions free?

Blair Absolute Solutions is free to download, with no in-app purchases.

### Is Digiduct free?

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

### Do Blair Absolute Solutions or Digiduct have ads?

Neither Blair Absolute Solutions nor Digiduct shows ads.

### Which is updated more often, Blair Absolute Solutions or Digiduct?

Blair Absolute Solutions ships an update every 27 months, and Digiduct every 2 months. Most recently, Blair Absolute Solutions was updated on October 5, 2026 and Digiduct on October 24, 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.*