# Piping DataBase vs HydroCalc Basic

The clearest difference is price: HydroCalc Basic at Free against Piping DataBase's $3.99. HydroCalc Basic also leads on update cadence (every 11 days vs every 3 months). Piping DataBase's advantage is chart position (#184 vs unranked) and iOS requirement (8.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

HydroCalc Basic is free to download; Piping DataBase costs $3.99 up front. Piping DataBase sells 1 one-off in-app purchase and HydroCalc Basic sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Piping DataBase ships an update every 3 months, HydroCalc Basic every 11 days. The most recent releases landed on September 4, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Piping DataBase | HydroCalc Basic |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/piping-database-flanges/id363683966/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 11 days** |
| Monetization | Paid | — |
| Best chart rank | **#184** | — |
| Size | 6 MB | 35 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Radin Alcira](https://appshunter.io/developer/352538434) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### Piping DataBase

[App page](https://appshunter.io/ios/app/piping-database-flanges/id363683966)

**Currently charting:** #184 Top Paid · Utilities (US App Store)

This app provides a mobile reference for pipe flange specifications, including dimensions, bolt details, and types. It's designed for professionals and students in industries like oil & gas and petrochemicals, offering unit conversion between US Customary and SI.

**Highlights:** Pipe flange specifications, Large diameter flange support, Multiple flange types, Bolt count, diameter, and length, Raised Face (RF) and Ring Type Joints (RTJ), US Customary and SI unit conversion

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flanges B16.47 | $1.99 | one-time |


### HydroCalc Basic

[App page](https://appshunter.io/ios/app/hydrocalc-basic/id6752577110)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Flow Units & Ad-Free | $1.99 | one-time |


## Frequently asked questions

### Is Piping DataBase free?

Piping DataBase costs $3.99, and also offers in-app purchases.

### Is HydroCalc Basic free?

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

### Do Piping DataBase or HydroCalc Basic have ads?

Neither Piping DataBase nor HydroCalc Basic shows ads.

### Which is updated more often, Piping DataBase or HydroCalc Basic?

Piping DataBase ships an update every 3 months, and HydroCalc Basic every 11 days. Most recently, Piping DataBase was updated on September 4, 2026 and HydroCalc Basic on September 8, 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.*