# Plumbing Formulator vs 5S continuous improvement

The clearest difference is in-app purchases: 5S continuous improvement at none against Plumbing Formulator's 4. 5S continuous improvement also leads on update cadence (every 8 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Plumbing Formulator sells 4 one-off in-app purchases. 5S continuous improvement asks for nothing beyond the download.

Plumbing Formulator ships an update every 2 months, 5S continuous improvement every 8 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Plumbing Formulator | 5S continuous improvement |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (7 ratings)](https://appshunter.io/ios/app/plumbing-formulator/id303497783/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 9.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 8 days** |
| Monetization | Free | — |
| Size | 123 MB | 23 MB |
| Requires iOS | 18.6 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Ochirkhuyag Tserenpil](https://appshunter.io/developer/1883012032) |

## What reviewers say

### Plumbing Formulator

[App page](https://appshunter.io/ios/app/plumbing-formulator/id303497783)

This professional calculator app provides over 200 formulas, calculators, and reference materials for plumbers, HVAC technicians, and mechanical contractors. It covers a wide range of calculations for water flow, piping, drainage, water heaters, pumps, and more, all in one pocket-sized tool.

**Highlights:** Over 200 formulas and calculators, Water flow and supply calculations, Pipe and piping calculations, Drainage and venting calculations, Water heater and pump calculations, Reference charts and code books, Pipe cut list optimizer

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $1.99 | one-time |
| Pro Purchase | $3.99 | one-time |
| Starter | $5.99 | one-time |
| Growth | $9.99 | one-time |


### 5S continuous improvement

[App page](https://appshunter.io/ios/app/5s-continuous-improvement/id6760182851)

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

**In-app purchases:** none


## Frequently asked questions

### Is Plumbing Formulator free?

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

### Is 5S continuous improvement free?

5S continuous improvement is free to download, with no in-app purchases.

### Do Plumbing Formulator or 5S continuous improvement have ads?

Neither Plumbing Formulator nor 5S continuous improvement shows ads.

### Which is updated more often, Plumbing Formulator or 5S continuous improvement?

Plumbing Formulator ships an update every 2 months, and 5S continuous improvement every 8 days. Most recently, Plumbing Formulator was updated on October 23, 2026 and 5S continuous improvement 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.*