# Carpentry Formulator vs Staircase Mojo (metric)

The clearest difference is review sentiment: Staircase Mojo (metric) at 80% against Carpentry Formulator's 25%. Staircase Mojo (metric) also leads on in-app purchases (none vs 1) and iOS requirement (13.0 vs 18.6). Carpentry Formulator's advantage is price (Free vs $1.99) and rating (3.8 vs 1.0). On ads and device support there is nothing between them.

Carpentry Formulator is free to download; Staircase Mojo (metric) costs $1.99 up front. Carpentry Formulator sells 1 one-off in-app purchase. Staircase Mojo (metric) asks for nothing beyond the download.

Carpentry Formulator holds the better App Store score, 3.8 against 1.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews complicate that: 25% of Carpentry Formulator's written reviews are positive against 80% of Staircase Mojo (metric)'s, so the app with the better star average is not the one people write more warmly about.

Carpentry Formulator ships an update every 2 months, Staircase Mojo (metric) every 64 months. The most recent releases landed on October 30, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Carpentry Formulator | Staircase Mojo (metric) |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/carpentry-formulator/id305583131/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/staircase-mojo-metric/id932974994/reviews) |
| Number of ratings | **4** | 1 |
| Positive reviews | 25.0% of reviews | **80.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 64 months |
| Monetization | **Free** | Paid |
| Size | 23 MB | 103 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Nicholas Summers](https://appshunter.io/developer/573034758) |

## 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 |


### Staircase Mojo (metric)

[App page](https://appshunter.io/ios/app/staircase-mojo-metric/id932974994)

Easily calculate spindle spacings for staircases and other regular spacing needs. Automatically determines stair angle and provides precise measurements adjusted for slope, with options to tweak maximum spacing for custom profiles.

**Highlights:** Automatic stair angle detection, Precise spindle spacing calculation, Adjustable maximum spacing, Slope-adjusted measurements, Easy-to-use interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Carpentry Formulator free?

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

### Is Staircase Mojo (metric) free?

Staircase Mojo (metric) costs $1.99, with no in-app purchases.

### Which has better reviews, Carpentry Formulator or Staircase Mojo (metric)?

Carpentry Formulator is rated higher. Carpentry Formulator averages 3.8 out of 5 from 4 ratings, while Staircase Mojo (metric) averages 1.0 from 1 ratings.

### Do Carpentry Formulator or Staircase Mojo (metric) have ads?

Neither Carpentry Formulator nor Staircase Mojo (metric) shows ads.

### Which is updated more often, Carpentry Formulator or Staircase Mojo (metric)?

Carpentry Formulator ships an update every 2 months, and Staircase Mojo (metric) every 64 months. Most recently, Carpentry Formulator was updated on October 30, 2026 and Staircase Mojo (metric) on October 29, 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.*