HVAC vs Feedback Loop
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC
This app provides quick and easy calculations for HVAC professionals and enthusiasts. It simplifies complex formulas for energy use, airflow, and duct dimensions, making them accessible on your iPhone or iPad.
- SFP calculations
- Heat recovery efficiency
- Air velocity in ducts
- Duct dimensioning
- Pressure drop calculations
- Equivalent diameters
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HVAC Calculator is an app that performs many calculations that are useful to have available for anyone working with or have interest in HVAC and energy use in buildings. The app performs many of the calculations that you never remember the formulas for when you need them for quick calculations, for example in a meeting or out on the construction site. Many of the calculations can also be a bit difficult to calculate with a normal calculator. Now you can perform these calculations easily on your iPhone/iPad. The app is universal, so you only have to buy it once to use it on both iPhone and iPad. The app helps you calculate all this and more: -SFP from measured/design fan power and airflow -SFP at reduced airflow for VAV ventilation -SFP at design conditions or maximum performance for VAV ventilation -Temperature efficiency of heat recovery -Temperature after heat recovery unit (HRU) in air handling unit (AHU) -Temperature of exhaust air from air handling unit after heat recovery -Actual temperature efficiency of heat recovery when the exhaust temperature is limited to minimum 5°C for reuse as frost free garage ventilation -Air velocity in ducts with known dimensions and airflow -Maximum airflow in a duct with dimensions and maximum air velocity as specified requirements -Dimensions of rectangular and circular spiral ducts for specified air flow and velocity requirements -Pressure drop in Pa/m for rectangular and circular spiral ducts -Equivalent diameters for rectangular ducts -Hydraulic diameter for rectangular ducts
Feedback Loop
Practice your interview skills with an AI-powered tool designed to simulate real job scenarios. Get instant feedback to refine your responses and boost your confidence for AI product management roles. Stand out as a top candidate in the tech industry.
- AI-generated interview questions
- Simulated interview scenarios
- Instant feedback on responses
- Confidence building
- Targeted for AI product managers
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Improve your interview skills and increase your chances of getting hired as an AI product manager with Feedback Loop. Our app, powered by AI, generates targeted questions to simulate real interview scenarios and help you practice and perfect your responses. Whether you're looking to get hired or improve your hiring skills in the tech industry, Feedback Loop is an essential resource. Our AI adapts to your progress, providing instant feedback to help you refine your technique and boost your confidence. With Feedback Loop, you'll be able to articulate your vision and expertise effectively and stand out as a top candidate in the competitive field of AI product management. ----- Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: Feedback Loop at Free against HVAC's $4.99. Feedback Loop also leads on iOS requirement (13.4 vs 16.0). HVAC's advantage is rating (4.0 vs 1.0) and in-app purchases (none vs 1). On ratings volume, ads and device support 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
Feedback Loop is free to download; HVAC costs $4.99 up front. Feedback Loop sells 1 in-app purchase, starting at $4.99 per 7 days. HVAC asks for nothing beyond the download.
HVAC holds the better App Store score, 4.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
| Parameter | HVAC | Feedback Loop |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.0 (1 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 5 months | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 13.4 — better |
| Further details — not scored | ||
| Size | 14 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Trond Rossvoll | Stepic Inc |
Customer experience
HVAC
Feedback Loop
In-app purchases
HVAC
No in-app purchases
Feedback Loop
- Pro$4.997 Days









