# Plumbing Formulator vs iManifold™

The clearest difference is in-app purchases: iManifold™ at none against Plumbing Formulator's 4. iManifold™ also leads on iOS requirement (13.0 vs 18.6). Plumbing Formulator's advantage is update cadence (every 2 months vs every 9 months). On price, ads and device support there is nothing between them.

Both are free to download. Plumbing Formulator sells 4 one-off in-app purchases. iManifold™ asks for nothing beyond the download.

Plumbing Formulator ships an update every 2 months, iManifold™ every 9 months. The most recent releases landed on October 23, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Plumbing Formulator | iManifold™ |
| --- | --- | --- |
| 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 9 months |
| Monetization | Free | — |
| Size | 123 MB | 20 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) | [nClarity, LLC](https://appshunter.io/developer/1623222704) |

## 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 |


### iManifold™

[App page](https://appshunter.io/ios/app/imanifold/id6742327239)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Plumbing Formulator free?

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

### Is iManifold™ free?

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

### Do Plumbing Formulator or iManifold™ have ads?

Neither Plumbing Formulator nor iManifold™ shows ads.

### Which is updated more often, Plumbing Formulator or iManifold™?

Plumbing Formulator ships an update every 2 months, and iManifold™ every 9 months. Most recently, Plumbing Formulator was updated on October 23, 2026 and iManifold™ on October 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*