# SwiftSize vs NATE ResLoad

The clearest difference is price: SwiftSize at $9.99 against NATE ResLoad's $169.99. SwiftSize also leads on rating (4.0 vs 2.3) and update cadence (every 10 months vs every 31 months). NATE ResLoad's advantage is iOS requirement (13.0 vs 17.0). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.

SwiftSize costs $9.99 and NATE ResLoad $169.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SwiftSize holds the better App Store score, 4.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews split almost evenly too, at 33% and 33% positive.

SwiftSize ships an update every 10 months, NATE ResLoad every 31 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | SwiftSize | NATE ResLoad |
| --- | --- | --- |
| Price | **$9.99** | $169.99 |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/swiftsize/id942306458/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/nate-resload-j/id1017417896/reviews) |
| Number of ratings | 3 | 3 |
| Positive reviews | 33.3% of reviews | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 31 months |
| Monetization | Paid | Paid |
| Best chart rank | **#123** | — |
| Size | 2 MB | 26 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Design Comfort](https://appshunter.io/developer/942306457) | [Carmel Software Corporation](https://appshunter.io/developer/317970398) |

## What reviewers say

### SwiftSize

[App page](https://appshunter.io/ios/app/swiftsize/id942306458)

**Currently charting:** #123 Top Paid · Business (US App Store)

This HVAC tool quickly calculates residential heating and cooling loads on-site. It streamlines the process for professionals, allowing for faster equipment sizing and more customer consultation time. Generate shareable PDF reports of your calculations.

**Highlights:** Quick heat load calculations, On-site measurements, Accurate equipment sizing, Shareable PDF reports, Minimizes engineering time, Equipment changeout focus

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### NATE ResLoad

[App page](https://appshunter.io/ios/app/nate-resload-j/id1017417896)

This app performs ACCA-approved residential load calculations for HVAC systems. It allows users to create detailed reports for cooling and heating loads, including room-by-room analysis, and email them as PDFs. It also includes a built-in HVAC Equipment Locator.

**Highlights:** ACCA-approved Manual J8 calculations, Field-based load calculations, Emailable PDF reports, Unlimited project creation, Global weather database, HVAC Equipment Locator included

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SwiftSize free?

SwiftSize costs $9.99, with no in-app purchases.

### Is NATE ResLoad free?

NATE ResLoad costs $169.99, with no in-app purchases.

### Which has better reviews, SwiftSize or NATE ResLoad?

SwiftSize is rated higher. SwiftSize averages 4.0 out of 5 from 3 ratings, while NATE ResLoad averages 2.3 from 3 ratings.

### Do SwiftSize or NATE ResLoad have ads?

Neither SwiftSize nor NATE ResLoad shows ads.

### Which is updated more often, SwiftSize or NATE ResLoad?

SwiftSize ships an update every 10 months, and NATE ResLoad every 31 months. Most recently, SwiftSize was updated on October 24, 2026 and NATE ResLoad on October 24, 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.*