PFM1000 vs ASHRAE DFDB Lite
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PFM1000
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Smart device for balancing heating and cooling systems. Balancing valves of heading European producers included. Successfully can be used for measuring very small differential and gauge pressures.
ASHRAE DFDB Lite
Calculate pressure loss for a selection of ASHRAE duct fittings. Create projects, customize inputs, and generate reports with spreadsheet attachments. Supports both I-P and SI units and works on iPhone and iPad.
- Pressure loss calculations for ASHRAE fittings
- Individual project creation
- Customizable input parameters
- Fitting code search feature
- Display and email reports
- I-P and SI unit support
- iPhone and iPad compatible
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The ASHRAE Duct Fitting Database Lite app is a free app that allows you to perform pressure loss calculations for a subset of the 240+ supply, common, and return/exhaust ASHRAE fittings listed in the 2021 ASHRAE Handbook—Fundamentals. These include the following: SD2-1 SD5-9 SR2-1 SR5-5 SF4-1 CD3-1 CD11-1 CR6-1 CR9-1 CR11-1 ED1-1 ED4-1 ER1-1 ER4-1 The following is a partial list of features of this app: 1. You can create individual projects, each with unique input values and results. 2. Each fitting has its own custom set of input parameters and results. 3. You can easily change the minimum and maximum allowable values for all input parameters. 4. The app includes a search feature that allows you to type in a partial or full fitting code name to quickly retrieve it. 5. You can display and email two types of reports. 6. The reports include a spreadsheet attachment that you can open on your desktop computer to conduct further analysis. 7. Inputs and results are displayed in both I-P and SI units. 8. The app works on both the iPhone and iPad and adjusts its user interface according to the device screen size. The ASHRAE Duct Fitting Database Lite application was designed exclusively for ASHRAE by Carmel Software Corporation.
Screenshots
Verdict
The clearest difference is update cadence: ASHRAE DFDB Lite at every 6 weeks against PFM1000's every 3 months. ASHRAE DFDB Lite also leads on iOS requirement (11.0 vs 17.0). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
PFM1000 ships an update every 3 months, ASHRAE DFDB Lite every 6 weeks. The most recent releases landed on October 17, 2026 and October 23, 2026 respectively.
| Parameter | PFM1000 | ASHRAE DFDB Lite |
|---|---|---|
| Price | Free | Free |
| Rating | — | 1.0 (2 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 3 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 43 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | SV Technics | ASHRAE, Inc. |
In-app purchases
PFM1000
No in-app purchases
ASHRAE DFDB Lite
No in-app purchases
