Engineering Systems Toolkit

477 Visuals & Field Tools

£7.99 · Designed for iPad. Not verified for macOS.

Now with Global Search across all 477 diagrams, Diagram of the Day, Share Sheet, and 8 field calculators — one for every engineering discipline. Free update. This app is the definitive visual reference for working engineers, technicians, students, and inspectors. Browse 477 professional-quality diagrams spanning 8 major engineering disciplines — all offline, all in one app. WHAT IS INSIDE 477 illustrations organized into 8 engineering categories: Electrical Systems — power distribution, panel wiring, conduit layouts, load centers Fire Alarm Systems — initiating devices, notification appliances, control panels, wiring HVAC Systems — air handling, duct networks, chilled water, refrigerant circuits BIM and Construction — floor plans, riser diagrams, coordination views, LOD references Enterprise IT — network topology, structured cabling, data center layout, TIA-942 PLC and Automation — ladder logic, I/O modules, PLC panels, field instrumentation SCADA and Controls — RTU diagrams, HMI screens, Modbus/DNP3 architecture, control loops RF and Radio Systems — antenna configurations, path diagrams, repeater systems, link diagrams GLOBAL SEARCH Search all 477 diagrams instantly by name across every category. One-tap category filter chips let you narrow results to a single engineering discipline in seconds. DIAGRAM OF THE DAY A fresh featured diagram appears on the home screen every day — automatically curated from all 8 disciplines. A new reference point every time you open the app. SHARE ANY DIAGRAM Send any illustration directly to colleagues, students, or inspection reports using the iOS Share Sheet — available from every diagram in the gallery. ENGINEERING CALCULATORS Each category includes a dedicated field calculator: Voltage Drop — NEC K-factor conductor sizing with pass/fail at 3% threshold Battery Standby — NFPA 72 battery Ah sizing for fire alarm panels HVAC — CFM airflow, cooling load in BTU/h and tons, duct sizing at target FPM BIM Space — multi-room gross/net area, GFA, and volume in imperial or metric IT Network — PoE budget (802.3af/at/bt) and IPv4 subnet calculator with CIDR PLC I/O — module count, chassis sizing, and scan time estimation RF Link Budget — FSPL, path loss, link margin with fading environment presets SCADA Timing — Modbus RTU frame timing, T3.5 gap, and DNP3 poll cycle load STANDARDS REFERENCE Built-in searchable reference covering NFPA 72, NEC, ASHRAE, ISO 19650, IEC 61131-3, IEC 62443, TIA-942, and ITU/FCC standards — filtered by engineering domain. KEY FEATURES Swipeable full-screen gallery — page through every diagram in a category Pinch-to-zoom — inspect fine detail on any illustration Favorites — star and collect your most-used diagrams Works fully offline — no internet connection required iPhone and iPad — optimized for all screen sizes and orientations Whether you are reviewing a design, studying for a certification, or troubleshooting a system in the field, this app puts 477 reference diagrams and professional engineering tools in your pocket.

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Version 2.0 introduces four major new features: Global Search — search all 477 diagrams by name across every category, with one-tap category filters Diagram of the Day — a new featured diagram surfaces on the home screen every day, drawn from all 8 disciplines Share Any Diagram — send illustrations to colleagues or reports via the iOS Share Sheet directly from the gallery 8 Field Calculators — purpose-built engineering calculators for every category, including NEC voltage drop, NFPA 72 battery sizing, ASHRAE CFM, PoE budget, FSPL link budget, and Modbus RTU timing

Version 2.0

The developer, Yuhsiu Lai, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Provider
    • Yuhsiu Lai
    Size
    • 1.4 GB
    Category
    • Education
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 iTech Tools
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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