You’ve hit your search limit
Start your free trial to keep exploring full traffic and performance insights.
Get Started- Home
- Free App Analytics
- Lineman's Reference - XFMR LAB
Lineman's Reference - XFMR LAB app analytics for July 31
Lineman's Reference - XFMR LAB
- Digital Apprentice LLC
- Apple App Store
- Paid
- Education
Learn it. Wire it. Energize it. Check your work.
Built by a working journeyman lineman for linemen and their apprentices. The XFMR Lab simulates distribution transformer banks driven by your own wiring — the metering, fusing, and faulting all behave the way you'd expect in the field.
NEW IN 2.0 — BUILT-IN TRANSFORMER TRAINING (Replacing XFMR INFO)
Six guided lessons take you from "what's a transformer?" to wiring a 3-pot bank:
• Start Here — What is a Transformer?
• Dual H Bushings — The Two Wirings & the Nameplate
• The Tap Changer — One Pot, Multiple System Voltages
• Three-Phase — The Three Phases and How They're Related
• Bank Identification — Delta or Wye, Open or Closed
• Your First Bank: Delta-Wye Closed (120/208)
• More lessons on the way!
Work the lessons in order, or jump straight to the labs.
ALSO NEW IN 2.0
• The Sandbox (Beta) — wire anything from scratch in a COMPLETELY-customizable lab, with live, vector-based voltage and fault logic baked in.
• Death Traps — scenario-based transformer traps linemen run into — and how to navigate them safely.
• A brand-new look across every lab — new graphics, sharper, faster, & easier to read in the field.
• Voltmeter you can now drag with two fingers; readings update as the leads move.
• Parallel the secondary coils by hand in wye secondary labs
• Stats that track lab completions, quiz scoring and for-fun stuff like the number of fuses you've blown.
• User Customizations - the user can now alter the spec of their labs; from grounding to parallel coil cutover-direction, requiring the 4th cutout, tap changer implementation and more.
• 2.0 is FREE for everyone who already owns XFMR Lab — thank you for years of feedback and encouragement.
WHAT YOU GET
Single Phase — Single Bushing · Dual Bushing
Three Phase (closed) — Delta-Delta · Delta-Wye · Wye-Delta · Wye-Wye
Three Phase (open) — Open Delta-Delta · Open Wye-Delta
Misc — Paralleling · 4th Cutout · Death Traps (6 Scenarios)
Advanced — Straight 480 · 240/480 · 277/480 · Corner-Grounded 240/480 · Wye-Wye 5-Wire (120/240 + 120/208) - all now able to be wired up Wye AND Delta on the topside
The Sandbox (Beta)
EVERY FUTURE UPDATE IS FREE - THE APP IS A ONE-TIME PURCHASE. I'm always working on new updates.
TOOLS & REFERENCE
• Volt, ohm and rotation meters with real behavior
• Nameplate, secondary coil and tap changer animations
• Reference diagrams for every standard bank
Learning Mode walks apprentices through every wrong-connection check. Journeymen and experienced users can keep this turned off if they'd like.
QUIZZES
• Classic Quiz — Select each lab you want in your quiz - with graded scoring across each lab.
• Advanced Quiz — You're provided with the job-site info and need to pick the right nameplate and coil setup, then wire it.
• Bank ID - A beginner's quiz tied into the new XFMR Training lesson plan. The user is provided with different primary and secondary wirings and must correctly identify them.
Used by 30,000+ linemen since 2021.
Questions? Suggestions? Reach me at info@digitalapprentice.net
Store Rank
The Store Rank is based on multiple parameters set by Google and Apple.
All Categories in
United States#60
Education in
United States#4
Create an account to see avg.monthly downloadsContact us
Lineman's Reference - XFMR LAB Ranking Stats Over Time
Similarweb's Usage Rank & Apple App Store Rank for Lineman's Reference - XFMR LAB
Store Rank
Rank
Lineman's Reference - XFMR LAB Ranking by Country
Counties in which Lineman's Reference - XFMR LAB has the highest ranking in its main categories
Top Competitors & Alternative Apps
Apps with a high probability of being used by the same users, from the same store.
North Carolina 811
North Carolina 811, Inc.
TradeSchool Mobile
TradeSchool Inc.
Registration & Learning System
ABC Virtual Communications
J. J. Keller Learning Center
J. J. Keller & Associates, Inc.
July 31, 2026