# DALC vs Building Start

The clearest difference is rating: Building Start at 3.4 against DALC's 2.2. Building Start also leads on review sentiment (50% vs 15%). DALC's advantage is update cadence (every 2 weeks vs monthly) and ratings volume (26 vs 8). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Building Start holds the better App Store score, 3.4 against 2.2. Both are backed by a comparable volume of ratings — 26 and 8 respectively. Written reviews point the same way: 15% of DALC's written reviews are positive against 50% of Building Start's.

DALC ships an update every 2 weeks, Building Start monthly. The most recent releases landed on October 8, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | DALC | Building Start |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.2 (26 ratings)](https://appshunter.io/ios/app/dalc/id427624076/reviews) | **[3.4 (8 ratings)](https://appshunter.io/ios/app/building-start/id442975774/reviews)** |
| Number of ratings | **26** | 8 |
| Positive reviews | 14.8% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free | Free |
| Size | 10 MB | 12 MB |
| Requires iOS | **6.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SHEET METAL CONTRACTORS NATIONAL ASSOCIATION, INC.](https://appshunter.io/developer/427624079) | [Building Start](https://appshunter.io/developer/442975777) |

## What reviewers say

### DALC

[App page](https://appshunter.io/ios/app/dalc/id427624076)

This tool helps engineers, architects, designers, and contractors accurately estimate air leakage from ductwork. It simplifies determining pass/fail for duct air leakage tests and allows combining multiple duct sections for total leakage calculations, adhering to industry standards.

**Highlights:** Estimate ductwork air leakage, Determine DALT pass/fail, Combine multiple duct sections, Calculate total allowable leakage, Provides suggested leakage classes, Compliant with industry standards

**Features:** macOS Compatibility

**In-app purchases:** none


### Building Start

[App page](https://appshunter.io/ios/app/building-start/id442975774)

This platform digitizes field testing for construction and engineering projects. It allows for centralized test plan creation and offline execution on field devices, synchronizing data back to the cloud upon completion.

**Highlights:** Centralized test plan authoring, Push test plans to field devices, Offline field testing capabilities, Data synchronization to cloud, Digital capture of construction projects, Support for TAB, Building Startup, Commissioning, Energy Audits

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

**In-app purchases:** none


## Frequently asked questions

### Is DALC free?

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

### Is Building Start free?

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

### Which has better reviews, DALC or Building Start?

Building Start is rated higher. DALC averages 2.2 out of 5 from 26 ratings, while Building Start averages 3.4 from 8 ratings.

### Do DALC or Building Start have ads?

Neither DALC nor Building Start shows ads.

### Which is updated more often, DALC or Building Start?

DALC ships an update every 2 weeks, and Building Start monthly. Most recently, DALC was updated on October 8, 2026 and Building Start on September 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.*