QControl vs HVAC Duct Flow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
QControl
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QControl — это мобильное приложение, разработанное для экспертизы и технического надзора, обеспечивающее контроль и автоматизацию процессов за строящимися объектами. С помощью QControl специалисты могут легко составлять ежедневные отчёты прямо на объекте, фиксировать нарушения или отклонения в выполнении работ, а также контролировать соблюдение мер безопасности. Напоминания и пуш уведомления помогают специалисту оставаться в контексте. Приложение позволяет заполнять чеклисты для проведения специальных проверок по установленным спискам. QControl упрощает взаимодействие между всеми участниками реализации проекта, обеспечивая прозрачность и контроль на всех этапах строительства.
HVAC Duct Flow
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Get fast answers for everyday duct and grille sizing checks. Size rectangular and round ducts, grilles and diffusers in one practical tool for the office or the field. • Size rectangular and round (spiral) ducts by constant velocity or equal friction. • Check velocity, friction loss (Pa/m) and velocity pressure for any duct size. • Convert a rectangular a×b duct to its equivalent round diameter, and back. • Size 8 grille and diffuser types with velocity, pressure drop and throw. • Share one-page PDF reports and switch between SI and IP units. • Use the app offline on iPhone and iPad, in 15 languages. Turn the airflow dial or type an exact value, choose a method, and review the results as they update live. Duct material roughness, air temperature and altitude are taken into account, and velocity warnings follow residential, office and industrial limits that you can tighten in Settings. Designed for mechanical engineers, HVAC professionals and technical teams working in design, estimating or on site. Calculations follow ASHRAE Fundamentals (Darcy–Weisbach with the Colebrook equation). The app is completely free, with no ads and no data collection. Download HVAC Duct Flow and make your next duct calculation easier. Results are for guidance; the responsibility for design and installation remains with the engineer.
Screenshots
Verdict
The clearest difference is iOS requirement: QControl at 12.0 against HVAC Duct Flow's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
QControl ships an update weekly, HVAC Duct Flow every 5 days. The most recent releases landed on November 12, 2026 and November 10, 2026 respectively.
| Parameter | QControl | HVAC Duct Flow |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 39 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Artur Shvaiberov | Ahmet Selvi |
In-app purchases
QControl
No in-app purchases
HVAC Duct Flow
No in-app purchases









