# Carpentry Formulator vs PsychWatch

The clearest difference is review sentiment: PsychWatch at 100% against Carpentry Formulator's 25%. PsychWatch also leads on rating (5.0 vs 3.8). Carpentry Formulator's advantage is monetization model (free vs free with in-app purchases). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Carpentry Formulator sells 1 one-off in-app purchase and PsychWatch sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

PsychWatch holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 4 and 2 respectively. Written reviews point the same way: 25% of Carpentry Formulator's written reviews are positive against 100% of PsychWatch's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Carpentry Formulator | PsychWatch |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (4 ratings)](https://appshunter.io/ios/app/carpentry-formulator/id305583131/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/psychwatch/id6749601638/reviews)** |
| Number of ratings | **4** | 2 |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 23 MB | 7 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [hipmata LLC](https://appshunter.io/developer/1831388289) |

## What reviewers say

### Carpentry Formulator

[App page](https://appshunter.io/ios/app/carpentry-formulator/id305583131)

This app provides over 150 formulas and dozens of conversions for carpenters and builders. It calculates loads on walls and headers, material quantities for projects, and dimensions for roofing and stairs. It also includes area and volume calculations for various shapes.

**Highlights:** Load calculations for walls and headers, Material quantity estimation (joists, studs, concrete), Roofing and stair dimension calculations, Area and volume formulas for geometric shapes, Dozens of unit conversion tools, Shareable calculation results

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Professional Features | $2.99 | one-time |


### PsychWatch

[App page](https://appshunter.io/ios/app/psychwatch/id6749601638)

This timer app is designed for professionals administering timed assessments. It offers one-touch controls, hands-free voice commands, and custom test sequences to streamline the process and keep focus on the client.

**Highlights:** One-touch timing with haptic feedback, Hands-free voice control, Customizable test sequences, Automatic test run history logging, Personalized display options (light/dark mode)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $3.99 | one-time |
| Premium | $5.99 | one-time |
| Premium | $7.99 | one-time |


## Frequently asked questions

### Is Carpentry Formulator free?

Carpentry Formulator is free to download, with in-app purchases available.

### Is PsychWatch free?

PsychWatch is free to download, with in-app purchases available.

### Which has better reviews, Carpentry Formulator or PsychWatch?

PsychWatch is rated higher. Carpentry Formulator averages 3.8 out of 5 from 4 ratings, while PsychWatch averages 5.0 from 2 ratings.

### Do Carpentry Formulator or PsychWatch have ads?

Neither Carpentry Formulator nor PsychWatch shows ads.

### Which is updated more often, Carpentry Formulator or PsychWatch?

Carpentry Formulator ships an update every 2 months, and PsychWatch every 2 months. Most recently, Carpentry Formulator was updated on October 6, 2026 and PsychWatch on October 9, 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.*