📖 Interactive Readers

Engineering, Visualized — 100+ Illustrated Readers with Zoomable Diagrams.

Explore All Interactive Readers →
Interactive reader illustration 1Interactive reader illustration 2
1 / 30
The Engineering Knowledge Platform

Engineering Learning, Design,
Technical Resources & Professional Development Platform

Engineering learning studios, one hub per discipline. Each combines design tools, 3D web apps, technical articles, and downloadable references — everything you need, organized by the work you do.

Explore All StudiosBrowse iOS Apps
🎮 3D Viewers, Designers & Simulators

111+ interactive 3D tools — see them in action as web apps here.

Explore All 3D Viewers & Simulators →

Power Substation 3D

HVAC 3D

Fire Alarm 3D

About Engineers Universe

Knowledge Grows
When It’s Shared.

Engineers Universe is built by engineers, educators, and technology professionals dedicated to making engineering, science, technology, and AI knowledge more accessible, visual, and practical.

Explore interactive learning studios, 3D models, simulations, engineering tools, technical resources, books, and applications — all designed to help you learn, grow, and succeed.

🎓
Interactive Learning
Studios, 3D viewers, simulations, and engineering tools — organized by discipline.
🌐
Visual & Practical
3D experiences, interactive schematics, and real-world design tools built for learners.
🏢
US-Based Professionals
Developed and maintained by experienced professionals committed to quality.

Join us in sharing knowledge, inspiring innovation, and helping others learn.

Start Learning →

Find your way in

Browse by discipline, by the software you use, or by the task you're trying to get done.

Get started fast
Hand-picked studios by category
⚡Most popular
Electrical Systems
2 live apps · NEC-based tools
🌡️Design + code
HVAC Systems
Load calcs, duct sizing, Manual J
🔥NFPA 72
Fire Alarm Systems
2 live apps · exam prep included
⚙️Simulators
Mechanical Systems
Water hammer, pump sizing & more
Engineering Learning Studios

Pick your discipline

Design tools, 3D viewers, articles, and downloads — all organized by engineering discipline.

🔥
Fire Alarm Systems2 Live
Design tools · 3D apps · articles
🌡️
HVAC SystemsLive
Design tools · 3D apps · articles
⚡
Electrical Systems2 Live
Design tools · 3D apps · articles
📡
Radio CommunicationsLive
Design tools · 3D apps · articles
⚙️
Mechanical SystemsLive
Design tools · 3D apps · articles
🏢
Enterprise IT NetworksLive
Design tools · 3D apps · articles
🤖
AI Engineering StudioLive
Design tools · 3D apps · articles
📊
AI and Data Science StudioLive
Design tools · 3D apps · articles
🚿
Plumbing SystemsLive
Design tools · 3D apps · articles
🧯
Fire SuppressionLive
Design tools · 3D apps · articles
🏗️
Civil & Structural StudioLive
Design tools · 3D apps · articles
🛰️
SCADA & Industrial ControlsLive
Design tools · 3D apps · articles
🛡️
Cybersecurity & OT SecurityLive
Design tools · 3D apps · articles
🏙️
Smart BuildingsLive
Design tools · 3D apps · articles
☀️
Renewable EnergyLive
Design tools · 3D apps · articles
🎥
Physical SecurityLive
Design tools · 3D apps · articles
💻
Software Engineering & CloudLive
Design tools · 3D apps · articles
📐
BIM, CAD & Digital DesignLive
Design tools · 3D apps · articles
📈
Industrial & Systems EngineeringLive
Design tools · 3D apps · articles
⚗️
Chemical & Process EngineeringLive
Design tools · 3D apps · articles
💧
Environmental & Water ResourcesLive
Design tools · 3D apps · articles
🔬
Materials Science & MetallurgyLive
Design tools · 3D apps · articles
🚀
Aerospace EngineeringLive
Design tools · 3D apps · articles
🎓
STEM Learning StudioLive
Design tools · 3D apps · articles
🛠️
Engineering SoftwareLive
Design tools · 3D apps · articles
🦾
Robotics & AutomationLive
Design tools · 3D apps · articles
🧩
Semiconductor & ElectronicsLive
Design tools · 3D apps · articles
🧭
MechatronicsLive
Design tools · 3D apps · articles
Most-used tools
Try these first — no login required
🔌Interactive
Circuit Simulator
Build & solve DC circuits online
⚡IEEE 1584
Arc Flash Calculator
Incident energy & PPE category
🌡️Manual J
HVAC Cooling Load
Block load & tonnage calc
💧NFPA 13
Sprinkler Hydraulics
Density/area demand calc
🎮 3D Viewers, Designers & Simulators

Interactive 3D Tools & Simulators

111+ interactive 3D viewers, system designers, and live simulators across every engineering discipline — real, working tools, not screenshots.

Power Substation 3D

HVAC 3D

Fire Alarm 3D

Explore All 3D Viewers & Simulators →
Popular Free Engineering Tools

Free interactive tools

Free online calculators, simulators, and design tools — no login required.

Featured reading
Editors' picks — start here
⚡Guide
NEC Electrical Code: A Practical Guide
How to read and apply NFPA 70
🤖AI
How Large Language Models Work
Transformers, attention & inference
🔒CIA Triad
Cybersecurity Fundamentals
Confidentiality, integrity, availability
☀️Renewables
Solar PV — How It Works
Panels, inverters, string sizing
Technical Articles

Learn from practicing engineers

250+ free technical guides — NEC code, HVAC design, AI engineering, structural analysis, and more.

⚡
NEC Electrical Code: A Practical Guide
How to read and apply NFPA 70 on real projects
🔥
Fire Alarm System Design Fundamentals
NFPA 72 initiating devices, NACs, and annunciation
🌡️
HVAC System Design Basics
Air-side vs. hydronic systems, loads, and duct sizing
🤖
How Large Language Models Work
Transformers, attention, tokenization, and inference
☀️
Solar PV — How It Works
Panels, inverters, string sizing, and NEC Article 690
🔒
Cybersecurity Fundamentals — CIA Triad
Confidentiality, integrity, availability, and NIST CSF
🏭
Modbus RTU & TCP Protocol Guide
Register mapping, function codes, and industrial wiring
⚙️
PE Mechanical Exam — Complete Guide
Exam format, NCEES reference, and study strategy
🏙️
BACnet Building Automation Protocol
Objects, services, MS/TP vs IP, and BAS integration
iOS Engineering Apps

108+ professional iOS apps

From NEC electrical code tools and fire alarm exam prep to AI workflow builders and certification guides — every app is built for working professionals.

Electrical EngineeringFire AlarmAI & AutomationExam PrepHealthLifestyle
Browse all 108+ apps
Construction Drawings
Low Voltage Systems
Construction Drawings iPad
Available on Apple Books

55+ engineering reference books

Practical guides and PE/FE/NICET exam prep — electrical, mechanical, civil/structural, fire alarm, SCADA, AI, and BIM/Revit.

Certificate-style courses

Professional Programs

Multi-module courses with real-project case studies and a certificate of completion — $9.99 flat, one-time, permanent access.

App Preview

See it in action

Real app screens — no mockups, no stock photos.

About EngineersUniverse

Built by practicing engineers

EngineersUniverse was created by a group of practicing engineers who wanted better reference tools in the field. Too many apps are generic. Too many books are outdated. We set out to build practical, professional-grade resources for real engineering work.

Today we publish 31 Learning Studios and 108+ iOS apps spanning electrical engineering, HVAC, fire alarm systems, SCADA, AI, cybersecurity, robotics, renewable energy, and more — plus 720+ technical articles and 160+ practice exams, all built around real-world workflows and professional deliverables.