# Dry Tools vs ASHRAE DFDB Lite

The clearest difference is review sentiment: Dry Tools at 100% against ASHRAE DFDB Lite's 0%. ASHRAE DFDB Lite's advantage is update cadence (every 6 weeks vs every 6 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Dry Tools ships an update every 6 months, ASHRAE DFDB Lite every 6 weeks. The most recent releases landed on September 28, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Dry Tools | ASHRAE DFDB Lite |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/dry-tools/id1462240541/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 45 MB | 7 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [CLIMATE BY DESIGN INTERNATIONAL, INC.](https://appshunter.io/developer/1462240540) | [ASHRAE, Inc.](https://appshunter.io/developer/375374912) |

## What reviewers say

### Dry Tools

[App page](https://appshunter.io/ios/app/dry-tools/id1462240541)

This app provides HVAC professionals and students with essential calculation tools, including air stream mixing, HVAC formulas, lead time planning, and a psychrometric calculator with weather data. It also offers educational content and industry-specific terminology.

**Highlights:** Air Stream Mixing Calculator, HVAC Formulas, Lead Time Wheel, Psychrometric Calculator, Integrated Weather Data, Educational Content, Industry Glossary

**Features:** macOS Compatibility

**In-app purchases:** none


### ASHRAE DFDB Lite

[App page](https://appshunter.io/ios/app/ashrae-dfdb-lite/id6475053772)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Dry Tools free?

Dry Tools is free to download, with no in-app purchases.

### Is ASHRAE DFDB Lite free?

ASHRAE DFDB Lite is free to download, with no in-app purchases.

### Do Dry Tools or ASHRAE DFDB Lite have ads?

Neither Dry Tools nor ASHRAE DFDB Lite shows ads.

### Which is updated more often, Dry Tools or ASHRAE DFDB Lite?

Dry Tools ships an update every 6 months, and ASHRAE DFDB Lite every 6 weeks. Most recently, Dry Tools was updated on September 28, 2026 and ASHRAE DFDB Lite on September 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*