HVAC Formulator vs Notable
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC Formulator
This app provides HVAC professionals with over 900 essential formulas and calculations for load calculations and system design. It supports both US and Metric units, offers instant switching, and includes 23 calculator categories and over 460 unit conversions. Designed for field use, it works offline and allows users to save and share results.
- Over 900 formulas and calculations
- US & Metric unit support
- 23 calculator categories
- 460+ unit conversions
- 8 temperature scales
- Offline functionality
- Save and share results
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HVAC FORMULATOR is the essential tool for Heating, Ventilating, and Air Conditioning professionals. With over 900 formulas and calculations, it covers everything from basic load calculations to advanced system design — all in your pocket. US & METRIC SUPPORT — Switch instantly between US (Imperial) and Metric (SI) units. Results display in both systems so you always have the value you need. Input labels and conversions update automatically. 23 CALCULATOR CATEGORIES including: - Cooling Load — Sensible, latent, and total cooling calculations, tons, EER, COP, and sensible heat ratio - Fan Laws — Speed and diameter affinity laws for CFM, pressure, and horsepower - Duct Sizing — Velocity, round and rectangular sizing, equivalent diameter, aspect ratio - Ventilation Rate — ASHRAE 62.1 breathing zone, air changes per hour, exhaust fan sizing - Electrical — Ohm's Law, single and three-phase power, motor FLA, watts to BTU/h - Gas Laws — Boyle's, Charles's, Gay-Lussac's, Combined, and Ideal Gas Law - Psychrometrics — Bypass factor, mixed air temperature, percent outside air, dew point - Hydronic Formulas — Heat transfer, flow rate, pipe velocity, expansion tank, Cv coefficient - Boiler — Efficiency calculations, BTU output, heat absorption - Refrigeration — Tonnage output, compression ratio, mass flow rate, COP - Ductwork — Velocity, velocity pressure, total pressure, equivalent round - Airside — Sensible heat, latent heat, total heat (US and Metric) - Piping — Pipe area, weight, friction loss, expansion, Hazen-Williams, 70+ formulas - Steam — Condensate loads, fuel calculations, steam flow - Pump Laws — Break horsepower, suction head, pump affinity laws - Energy — Fuel values for oil, gas, coal, propane, ethanol, and more - Heating Design — Electric heating, baseboard, radiant ceiling, boiler capacity, hydronic snow melting - Heating Requirement — Insulation-based load calculations - Humidity — Specific humidity, relative humidity, sensible and latent heat - Loads — Temperature loads, heat gains from lights, equipment, and machines - Temperature — Mixed air, liquid mixing, final temperature calculations - Waterside System — Total heat, evaporator and condenser flow rates - Air Change Rate — Air changes per hour, air flow rate 460+ UNIT CONVERSIONS across 16 categories: Metric, Pressures, BTU, Linear, Square, Cubic, Liquid Measures, Weights, Flows, Power, Horsepower, Watts, Hydraulic, Ft-Lbs, Sand/Volume, and HVAC-specific conversions. 8 TEMPERATURE SCALES — Convert between Celsius, Fahrenheit, Kelvin, Rankine, Reaumur, Newton, Delisle, and Romer. BUILT FOR PROFESSIONALS: - Search across all 900+ formulas instantly - Mark favorites for quick access - Save calculation history with full breakdown - Share and export results - Clean, fast interface designed for field use - Works offline — no internet required HVAC FORMULATOR is a professional-grade tool built for HVAC technicians, engineers, contractors, and students. New formulas and features are added regularly.
Notable
Instantly distill key insights from videos, articles, and text using AI. Capture, share, and manage your takeaways with a user-friendly interface. Save, bookmark, and export notes as images or direct links for easy sharing.
- AI-powered summarization
- Takeaway ratings and sorting
- Save and bookmark notes
- Share direct links
- Export notes as images
- Customize summary length and language
- Capture pre-written takeaways
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Instantly summarize key points from videos, articles, and more with AI. Effortlessly capture, share, find, vote and manage takeaways in one place, from anywhere. Top 10 takeaways of Notable AI. 1. DISTILL THE GIST Get key insights, lessons, and conclusions of the contents. Not just plain, repetitive summaries without priority. 2. TAKEAWAYS RATINGS AND SORTING Each takeaway is rated by users and AI, so you quickly find the most useful and actionable gems that are worth your attention. 3. FAST, EASY, DELIGHTFUL Navigating video with timestamps, full screen reading, ad-free experience, fast responsive UI, light & dark mode, clean design, and more. 4. SAVE AND BOOKMARK Easily save takeaways summarized as a note. Bookmark notes to read later and collect useful notes for better knowledge retention. 5. SHARE DIRECT LINKS Share a note as a link, and your friends can quickly open the note in their browser. No app download or login necessary. 6. SHARE EYE-CATCHING IMAGES Export a note as images, and share on Instagram, LinkedIn, Twitter and more. Choose from many beautiful templates. 7. SUMMARIZE LIKE A PRO Support 1hr+ long video. Customize summary language. Customize length of takeaways. 8. CAPTURE PRE-WRITTEN TAKEAWAYS Spot an useful list of points in a post, slide, or comment? Simply paste them in or take a photo, and import them effortlessly. 9. ENTER TAKEAWAYS DIRECTLY Have takeaways for offline content, event, experience, or knowledge? Jot them down using an easy note editing UI. 10. FREE TIER AVAILABLE. SUBSCRIPTION NOT REQUIRED Finding, reading, and creating takeaways notes are free. Subscription offers premium features and complimentary credits. By using the app, you confirm that you acknowledge and accept Notable's Privacy Policy and Terms of Service: - https://about.getnotable.ai/#privacy - https://about.getnotable.ai/#tos
Screenshots
Verdict
The clearest difference is price: Notable at Free against HVAC Formulator's $4.99. Notable also leads on rating (4.5 vs 2.0) and update cadence (every 4 weeks vs every 2 months). On ads, in-app purchases 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
Notable is free to download; HVAC Formulator costs $4.99 up front. HVAC Formulator sells 1 one-off in-app purchase and Notable sells 6 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.
Notable holds the better App Store score, 4.5 against 2.0. That said, the two scores are not equally well evidenced: Notable has 8 ratings behind it against 1, so its average is the more settled of the two.
HVAC Formulator ships an update every 2 months, Notable every 4 weeks. The most recent releases landed on October 31, 2026 and November 3, 2026 respectively.
| Parameter | HVAC Formulator | Notable |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 2.0 (1 ratings) | 4.5 (8 ratings) — better |
| Positive reviews | 9.1% of reviews | — |
| Number of ratings | 1 | 8 — better |
| Update frequency | Every 2 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 73 MB | 26 MB |
| Age rating | 4+ | 12+ |
| Developer | Historycentral.com | Notable AI Inc. |
Customer experience
HVAC Formulator
Notable
In-app purchases
HVAC Formulator
- HVAC Pro$3.99
Notable
- Notable Plus (Monthly)$7.991 Month
- Notable Plus (Annual)$71.901 Year
- 20 Credits$2.99
- 60 Credits$7.99
- 180 Credits$19.99
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- 540 Credits$49.99
Questions
Is HVAC Formulator free?
Is Notable free?
Which has better reviews, HVAC Formulator or Notable?
Do HVAC Formulator or Notable have ads?
Which is updated more often, HVAC Formulator or Notable?
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