# Psychrometer °F vs BluVac

The clearest difference is in-app purchases: BluVac at none against Psychrometer °F's 1. BluVac also leads on ads (none vs shown) and rating (5.0 vs 4.5). Psychrometer °F's advantage is review sentiment (67% vs 36%) and ratings volume (133 vs 2). On price there is nothing between them.

Both are free to download. Psychrometer °F sells 1 one-off in-app purchase. BluVac asks for nothing beyond the download.

BluVac holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Psychrometer °F has 133 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 67% of Psychrometer °F's written reviews are positive against 36% of BluVac's, so the app with the better star average is not the one people write more warmly about.

Psychrometer °F ships an update every 5 months, BluVac every 2 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Psychrometer °F | BluVac |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (133 ratings)](https://appshunter.io/ios/app/psychrometer-f/id650395794/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/bluvac/id1227222428/reviews)** |
| Number of ratings | **133** | 2 |
| Positive reviews | **66.7% of reviews** | 36.4% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Ad-supported | **Free** |
| Size | 9 MB | 25 MB |
| Requires iOS | 18.6 | **11.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [JUN KANAYAMA](https://appshunter.io/developer/605648452) | [measureQuick](https://appshunter.io/developer/1227222427) |

## What reviewers say

### Psychrometer °F

[App page](https://appshunter.io/ios/app/psychrometer-f/id650395794)

This app calculates thermal comfort by evaluating heat, cold, dryness, and moisture. It provides detailed air property calculations and indicates if conditions are within a comfortable range, with easy dial input and color-coded temperature.

**Highlights:** Thermal comfort calculation, Air property analysis, Color-coded temperature, Dial input, Outdoor weather integration, Psychrometer type selection

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


### BluVac

[App page](https://appshunter.io/ios/app/bluvac/id1227222428)

Connect to compatible vacuum gauges via Bluetooth to perform detailed system evacuations. Features timed tests, decay tests, and data recording. Offers advanced reporting, multiple gauge connections, and geolocation for enhanced screenshots.

**Highlights:** Bluetooth gauge connection, Timed evacuation tests, Decay test functionality, Detailed results viewing, mQ Assist integration, Pro Report feature, Connect up to 6 gauges

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Psychrometer °F free?

Psychrometer °F is free to download, with in-app purchases available.

### Is BluVac free?

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

### Which has better reviews, Psychrometer °F or BluVac?

BluVac is rated higher. Psychrometer °F averages 4.5 out of 5 from 133 ratings, while BluVac averages 5.0 from 2 ratings.

### Do Psychrometer °F or BluVac have ads?

Psychrometer °F shows ads; BluVac does not.

### Which is updated more often, Psychrometer °F or BluVac?

Psychrometer °F ships an update every 5 months, and BluVac every 2 months. Most recently, Psychrometer °F was updated on November 6, 2026 and BluVac on November 2, 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.*