HVAC Toolkit vs PlanSnap
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC Toolkit
This comprehensive toolkit offers essential HVAC calculations and tools for professionals. It combines multiple specialized applications into a single, convenient package for iPhone and iPad users.
- Equipment tracking and customization
- Refrigerant pressure-temperature charts
- Refrigerant charge calculations
- Duct sizing
- Cooling and heating load calculations
- Psychrometric calculations
- Steam tables
- Pipe sizing for liquid, steam, and gas
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The HVAC Toolkit app for the iPhone and iPad is the essential app for anyone in the HVAC industry. It includes a combination of many of our stand-alone iOS applications. Individually, the apps cost a total of $70. By purchasing the Toolkit, you pay only $24: 1. HVAC Equipment Locator 2. HVAC PT Chart 3. HVAC Refrigerant Charge 4. HVAC Duct Sizer 5. HVAC Quick Load 6. Psychrometrics 7. Steam Tables 8. Pipe Sizer - Liquid 9. Pipe Sizer - Steam 10. Pipe Sizer - Gas High 11. Pipe Sizer - Gas Low This is a universal app that works on both the iPhone and iPad. The "HVAC Equipment Locator" module allows you to track, share, and customize your equipment nameplate and maintenance data. The version here includes the ability to customize your input screens. The "HVAC PT Chart" module allows you to easily view the pressure-temperature properties of 75 refrigerants. Think of this app as a digital version of the paper PT charts that you may have carried around with you in the past. The "HVAC Refrigerant Charge" module allows you to perform superheat and subcool refrigerant charge calculations on-the-fly. This app includes pressure-temperature data for over 75 common refrigerants. The "HVAC Duct Sizer" module allows you to quickly size one HVAC duct run and a range of duct sizes. You can specify the total airflow in CFM (or L/s), the aspect ratio and one of either the velocity of air or the friction loss per 100 feet (30 meters). The "HVAC Quick Load" module allows you to perform quick and simple HVAC cooling and heating load calculation analysis. You can specify the building type, total area, and # of people. The results include the total cooling and heating loads and airflows. The "Psychrometrics" module allows you to easily perform single-state and mixed-air HVAC psychrometric calculations for a wide range of barometric air pressures. The "Steam Tables" module allows you to calculate the properties of saturated or superheated steam by specifying 2 input properties. The "HVAC Pipe Sizer - Liquid" module allows you to size a pipe run with many different types of liquids (or fluids), pipe material and fitting types. The "HVAC Pipe Sizer - Steam" module allows you to size a steam pipe run, and it also includes a bonus steam table calculator. The "HVAC Pipe Sizer - Gas High/Low" module allows you to quickly size a simple low (less than or equal to 1.5 psi) and high (greater than 1.5 psi) pressure gas piping system by inputting a number of piping and gas properties. This application includes all of the great features of the individual HVAC iOS applications such as the use of slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results. It also allows you to specify different types of liquids, gases, pipe material types, fitting quantities, min and max ranges, and step values. All of the above modules display units in English or Metric. Also, all of the above modules allow you to send emails with inputs and results. The "HVAC Toolkit" application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, Autodesk (the makers of AutoCAD) acquired our load calculation software and incorporated it into their leading 3D modeling software called Revit. In addition, Carmel has developed customized apps for organizations such as ASHRAE, Mitsubishi Electric, and Pacific Gas and Electric, amongst others. We also offer all of the above modules as individual apps for the iPhone/iPad: 1. HVAC ResLoad-J 2. HVAC Psych HD 3. HVAC Duct Sizer 4. HVAC Pipe Sizers 5. Steam Tables 6. Psychrometric Plus 7. Psychrometric LT 8. HVAC Pipe Sizer Plus 9. HVAC Pipe Sizer Gas Plus 10. HVAC Quick Load 11. HVAC Load Plus 12. HVAC Residential Load Calcs 13. HVAC Toolkit Ultimate 14. HVAC ASHRAE 62.1 15. HVAC ResVent 62.2 16. HVAC ASHRAE DFDB 17. HVAC ASHRAE Psych Chart
PlanSnap
Easily add photos to PDF plans by pinning them to specific locations. Organize construction pictures and share PDF sets with embedded photos with team members. Ideal for architects, engineers, and contractors to streamline project communication.
- Pin photos to specific locations on PDF plans
- Organize construction pictures by project
- Share PDF plans with embedded photos
- Upload and add photos from phone gallery
- Offline photo uploading when reconnected
- Download photo sets for backup
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PlanSnap is an easy way to add photos to PDF plans. The app organizes construction pictures by pinning them to specific locations on a plan. Then you can download or share the set of PDF + photos with other team members. Created by structural design firm DLK Engineering LLC, PlanSnap is designed to help contractors, engineers, and architects share project photos and minimize the need for on-site meetings. For architects and engineers, upload your PDF set and share the link with a contractor. When the someone adds pictures to the PDF, anyone with the link can view, download, or share them with others. Note that you can also add photos of your hand sketches, screenshots, etc. For contractors, upload a new PDF by choosing a file from you phone (or open a previous PlanSnap link), and then start adding photos by long-tapping any spot on the PDF. Then a link can be shared to give other team members access to the PDF with the photos. If there is no reception at the jobsite, leave PlanSnap open so it can upload your photos when you are reconnected. Or, you can just add photos to the PDF from your phone gallery at anytime. Tip for locating photos: For maximum clarity, pin the photo to the location on the PDF that represents *where you were standing* when you took it, rather than pinning it to the element you photographed. Tip for sharing links: Save your PlanSnap links (in a shared Note, for instance) so you find them later as needed. And then download your photos to keep a backup copy. NOTE: Photos are not stored by PlanSnap forever, so make sure to download and keep your photo sets for your own records!
Screenshots
Verdict
The clearest difference is price: PlanSnap at Free against HVAC Toolkit's $23.99. PlanSnap also leads on update cadence (weekly vs every 6 months). HVAC Toolkit's advantage is review sentiment (73% vs 50%). On rating, ratings volume, 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
PlanSnap is free to download; HVAC Toolkit costs $23.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for HVAC Toolkit against 5.0 for PlanSnap. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews are what separate them: 73% of HVAC Toolkit's written reviews are positive against 50% of PlanSnap's.
HVAC Toolkit ships an update every 6 months, PlanSnap weekly. The most recent releases landed on September 14, 2026 and June 11, 2026 respectively.
| Parameter | HVAC Toolkit | PlanSnap |
|---|---|---|
| Price | $23.99 | Free — better |
| Rating | 5.0 (2 ratings) | 5.0 (2 ratings) |
| Positive reviews | 73.3% of reviews — better | 50.0% of reviews |
| Number of ratings | 2 | 2 |
| Update frequency | Every 6 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 50 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Carmel Software Corporation | Vihanti Digital Services Private Limited |
Customer experience
HVAC Toolkit
PlanSnap
In-app purchases
HVAC Toolkit
No in-app purchases
PlanSnap
No in-app purchases





