TESIGN
SAVED

EN · KO

Auto-generated — not yet edited · only the numbers are verified

  1. TESIGN / RADAR
  2. STORE CARD
  3. Lineman's Reference - XFMR LAB
Lineman's Reference - XFMR LAB icon

Lineman's Reference - XFMR LAB

Digital Apprentice LLC

Learn it.

★ 4.6 (329)Paid #98 USLast observed chart rank per day over 14 days. Taller is better (#1 is tallest). Hollow bars mean no observation.2026-09-02 no data2026-09-03 no data2026-09-04 no data2026-09-05 no data2026-09-06 no data2026-09-07 no data2026-09-08 no data2026-09-09 no data2026-09-10 no data2026-09-11 no data2026-09-12 no data2026-09-13 no data2026-09-14 no data2026-09-15 #98best rank in the 14 days#98Last 14 days · paid chart rankhollow = no data

RANKS Paid US #98

Screenshots and the icon are reduced copies of the developer’s assets; each opens the App Store page. Removal requests: hello@tesign.com.

AT A GLANCE

USAGE
$19.99 · in-app purchases [unconfirmed] · iOS/iPadOS
GENRE
Education · Entertainment
CURRENT VERSION
2.0.6 ·
DEVELOPER
Digital Apprentice LLC ↗
APP STORE
View on the App Store ↗
CATEGORY
EDUCATION

A summary, not legal advice.

STORE DESCRIPTION

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 Th…

The opening of the App Store description as stored, at most 600 characters. Written by the developer; formatting is not rendered.

RATING · RATING COUNT TREND

  1. ★ 4.6329

The last observation of each day. A sudden jump in the count can be rating inflation — read it next to the rank change.

TIMELINE

  1. Released on the App Store
  2. Current version released
  3. First observed on a chart by TESIGN

AI chooses the lists under the owner’s delegation. No human review is running in September 2026. Total stars, increases, cross-source signals, last updates and licences are shown as evidence. How ranks work →

If this app gets editorial text (why, build, who, start, caveat) it becomes an edited entry. Until then the page shows only Apple’s public store information and our observed numbers.

App Store is a service mark of Apple Inc. Apple and the Apple logo are trademarks of Apple Inc. · Chart and rating source: Apple (top 100 free/paid per country, observed twice a day)