# Psychrometer °F vs CTRAPR

The clearest difference is in-app purchases: CTRAPR at none against Psychrometer °F's 1. CTRAPR also leads on ads (none vs shown) and rating (5.0 vs 4.5). Psychrometer °F's advantage is ratings volume (133 vs 2). On price, update cadence and device support there is nothing between them.

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

CTRAPR 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.

Psychrometer °F ships an update every 5 months, CTRAPR every 6 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Psychrometer °F | CTRAPR |
| --- | --- | --- |
| 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/ctrapr/id6743125757/reviews)** |
| Number of ratings | **133** | 2 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 5 months** | Every 6 months |
| Monetization | Ad-supported | **Free** |
| Size | 9 MB | 34 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [JUN KANAYAMA](https://appshunter.io/developer/605648452) | [Centrix Corporation](https://appshunter.io/developer/911751076) |

## 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 |


### CTRAPR

[App page](https://appshunter.io/ios/app/ctrapr/id6743125757)

Easily manage your profile, register for events, and access important information. Purchase tickets, keep your details current, and stay updated with the latest news. This app provides a streamlined experience for event management and connectivity.

**Highlights:** Profile management, Event registration, Ticket purchasing, Information access, Notifications, User data updates

**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 CTRAPR free?

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

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

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

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

Psychrometer °F shows ads; CTRAPR does not.

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

Psychrometer °F ships an update every 5 months, and CTRAPR every 6 months. Most recently, Psychrometer °F was updated on November 1, 2026 and CTRAPR on November 4, 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.*