# Building Start vs AeroBT

The clearest difference is rating: AeroBT at 5.0 against Building Start's 3.4. AeroBT also leads on iOS requirement (11.0 vs 15.0). Building Start's advantage is update cadence (monthly vs every 13 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

AeroBT holds the better App Store score, 5.0 against 3.4. Both are backed by a comparable volume of ratings — 8 and 3 respectively.

Building Start ships an update monthly, AeroBT every 13 months. The most recent releases landed on August 16, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Building Start | AeroBT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (8 ratings)](https://appshunter.io/ios/app/building-start/id442975774/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/aerobt/id1466854985/reviews)** |
| Number of ratings | **8** | 3 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 13 months |
| Monetization | Free | Free |
| Size | 12 MB | 56 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Building Start](https://appshunter.io/developer/442975777) | [Cylon Controls Limited](https://appshunter.io/developer/1466854984) |

## What reviewers say

### 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


### AeroBT

[App page](https://appshunter.io/ios/app/aerobt/id1466854985)

This tool simplifies VAV balancing for various VAV controllers. It allows users to drive VAV boxes to maximum or minimum airflow, automatically calculate K-factors from hood measurements, and zero airflow sensors. The app also includes override functions for troubleshooting mechanical issues.

**Highlights:** VAV balancing for FBVi, CBV, CBV-N controllers, Drive VAV boxes to max/min airflow, Automatic K-factor calculation, Automatic airflow sensor zeroing, Damper override for troubleshooting

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Building Start free?

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

### Is AeroBT free?

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

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

AeroBT is rated higher. Building Start averages 3.4 out of 5 from 8 ratings, while AeroBT averages 5.0 from 3 ratings.

### Do Building Start or AeroBT have ads?

Neither Building Start nor AeroBT shows ads.

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

Building Start ships an update monthly, and AeroBT every 13 months. Most recently, Building Start was updated on August 16, 2026 and AeroBT on September 15, 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.*