# Piping DataBase vs Arc Calculations

The clearest difference is in-app purchases: Arc Calculations at none against Piping DataBase's 1. Arc Calculations also leads on price ($2.99 vs $3.99). Piping DataBase's advantage is update cadence (every 3 months vs every 56 months) and chart position (#184 vs unranked). On ads and device support there is nothing between them.

Piping DataBase costs $3.99 and Arc Calculations $2.99 up front. Piping DataBase sells 1 one-off in-app purchase. Arc Calculations asks for nothing beyond the download.

Piping DataBase ships an update every 3 months, Arc Calculations every 56 months. The most recent releases landed on September 4, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Piping DataBase | Arc Calculations |
| --- | --- | --- |
| Price | $3.99 | **$2.99** |
| 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 | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 56 months |
| Monetization | Paid | — |
| Best chart rank | **#184** | — |
| Size | 6 MB | 1 MB |
| Requires iOS | **8.0** | 16.1 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Radin Alcira](https://appshunter.io/developer/352538434) | [Imran Pinjara](https://appshunter.io/developer/1484488781) |

## 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 |


### Arc Calculations

[App page](https://appshunter.io/ios/app/arc-calculations/id1491438925)

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

**In-app purchases:** none


## Frequently asked questions

### Is Piping DataBase free?

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

### Is Arc Calculations free?

Arc Calculations costs $2.99, with no in-app purchases.

### Do Piping DataBase or Arc Calculations have ads?

Neither Piping DataBase nor Arc Calculations shows ads.

### Which is updated more often, Piping DataBase or Arc Calculations?

Piping DataBase ships an update every 3 months, and Arc Calculations every 56 months. Most recently, Piping DataBase was updated on September 4, 2026 and Arc Calculations on September 15, 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.*