# Plumbing Formulator vs HyTools

The clearest difference is rating: Plumbing Formulator at 4.6 against HyTools's 4.0. HyTools's advantage is review sentiment (50% vs 9%) and in-app purchases (none vs 4). On price, ratings volume, update cadence and ads there is nothing between them.

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

Plumbing Formulator holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 7 and 5 respectively. Written reviews complicate that: 9% of Plumbing Formulator's written reviews are positive against 50% of HyTools's, so the app with the better star average is not the one people write more warmly about.

Plumbing Formulator ships an update every 2 months, HyTools every 6 weeks. The most recent releases landed on October 30, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Plumbing Formulator | HyTools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (7 ratings)](https://appshunter.io/ios/app/plumbing-formulator/id303497783/reviews)** | [4.0 (5 ratings)](https://appshunter.io/ios/app/hytools/id537674477/reviews) |
| Number of ratings | **7** | 5 |
| Positive reviews | 9.1% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 123 MB | 114 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [IMI Hydronic Engineering International SA](https://appshunter.io/developer/508015425) |

## 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 |


### HyTools

[App page](https://appshunter.io/ios/app/hytools/id537674477)

This app provides HVAC professionals with a comprehensive suite of hydronic calculation tools. It assists with tasks like valve sizing, pressure drop calculations, and radiator power estimation. The tool offers unit conversion and language selection for user convenience.

**Highlights:** Hydronic calculator, Valve sizing and presetting, Radiator power estimation, Pipe sizing, Unit conversion, Pressure maintenance calculation

**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 HyTools free?

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

### Which has better reviews, Plumbing Formulator or HyTools?

Plumbing Formulator is rated higher. Plumbing Formulator averages 4.6 out of 5 from 7 ratings, while HyTools averages 4.0 from 5 ratings.

### Do Plumbing Formulator or HyTools have ads?

Neither Plumbing Formulator nor HyTools shows ads.

### Which is updated more often, Plumbing Formulator or HyTools?

Plumbing Formulator ships an update every 2 months, and HyTools every 6 weeks. Most recently, Plumbing Formulator was updated on October 30, 2026 and HyTools on October 23, 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.*