# EngiTools Pro

> EngiTools Pro (iPhone/iPad app by Kui Yan Marc YU.)

- Source: https://appshunter.io/ios/app/engitools-pro/id6753354185 (this page in markdown: same URL + `.md`)
- Developer: [Kui Yan Marc YU](https://appshunter.io/developer/1843673863)
- Category: Reference, Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 27 MB
- Languages: English
- Released: 2025-10-09
- Data updated: 2026-07-02
- User reviews in markdown: https://appshunter.io/ios/app/engitools-pro/id6753354185/reviews.md

## What is EngiTools Pro?

EngiTools Pro - The Ultimate Engineering Pocket Reference

Stop wasting time searching through heavy handbooks, scattered PDFs, or unreliable websites. EngiTools Pro is the essential, all-in-one productivity app designed specifically for Mechanical, HVAC, Piping, and Civil Engineers.

Whether you are on-site, in a meeting, or drafting in the office, get instant access to precise engineering data, dimensional references, and complex calculations right in your pocket.


CORE FEATURES:

Comprehensive Unit Converter

• Convert intuitively across a massive database of engineering units.

• Supports scientific notation and smart formatting for high-precision results.

• Includes categories for Length, Area, Volume, Mass, Pressure, Energy, Power, and more.


HVAC & Psychrometrics

• Psychrometric Chart Calculator: Instantly calculate Enthalpy, Dew Point, Humidity Ratio (w), Absolute Humidity, and Density by inputting Dry Bulb and RH/WB.

• Fresh Air Requirement (ASHRAE 62.1-2022): Look up required outdoor air rates (L/s·person, cfm/ft²) across various room types instantly. Supports both SI and IP units.


Piping & Flange Reference

• Pipe Thickness & Weight: Quickly determine Outer/Inner Diameter, Wall Thickness, and Weight per meter/foot across different nominal sizes (DN/NPS) and schedules.

• Flange Dimensions (BS 1092-1): Comprehensive lookup for Weld-neck flanges (Raised face). Get exact PCD, bolt hole diameters, neck dimensions, and bolting requirements for various Pressure Ratings (PN).


Fastener Dimensions (Bolt, Nut, Washer)

• Accurate geometric data for Hexagon Head Bolts, Screws, Nuts, and Flat Washers.

• Look up pitch, width across flats (s), width across corners (e), head height (k), and thread lengths based on metric sizes.


WHY CHOOSE ENGITOOLS PRO?

• Blazing Fast & Offline: No internet connection required. Get your data instantly, even in deep basements or remote sites.

• Built for Professionals: Data is sourced from recognized industry standards (ASHRAE, BS, etc.).

• Sleek UI: Optimized for both Light and Dark modes to reduce eye strain during long working hours. Auto-scales perfectly to your screen size.

• No Interruptions: A clean, distraction-free environment tailored for engineering workflows.


Upgrade your engineering toolkit today. Work smarter, calculate faster, and design with confidence using EngiTools Pro!

(Note: EngiTools Pro is intended for general reference. Users should always verify calculations with official standards for critical engineering designs.)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Upgrade to Premium | $4.99 | one-time |



## Version history (last 5 releases)

### 1.0.8 — 2026-06-22

-New Added Calculator Function

### 1.0.7 — 2026-04-02

-Bug Fixed

### 1.0.6 — 2025-11-12

-Bug Fixed

### 1.0.5 — 2025-11-09

New Function Added 
-Bolt / Nut / Washer standard tables
-Fresh Air requirement reference
-Home button for quicker navigation

### 1.0.2 — 2025-10-22

Bug Fixed

## More apps by Kui Yan Marc YU

- [麻雀精算師: 計分器](https://appshunter.io/ios/app/id6757151657)
- [Timely: Shared Calendar Widget](https://appshunter.io/ios/app/timely-shared-calendar-widget/id6759915564)
- [Nexus: Life Planner & Habits](https://appshunter.io/ios/app/nexus-life-planner-and-habits/id6762136892)

All apps by Kui Yan Marc YU: https://appshunter.io/developer/1843673863

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-02.*