Comparison

2017 Master Electrician Ref. vs Subs

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

2017 Master Electrician Ref.

This digital handbook provides electricians and related professionals with essential electrical formulas, diagrams, and reference tables. It offers calculations, a dictionary of terms, and detailed information on wiring, motors, transformers, and more, all accessible on a mobile device.

Highlights
  • Electrical formulas and calculations
  • Wiring diagrams for various systems
  • Motor and transformer specifications
  • Conductor and ampacity tables
  • Dictionary of electrician terms
  • NEMA standards and diagrams
  • Math and conversion tools
Features
Read full description

Master Electrician Reference (or MER for short) 2017 is your electronic pocket electrician reference guide. MER is for electrical designers, engineers, installers, contractors, facility managers, inspectors, exam candidates, apprentices, electricians, journeymen, architects, and technicians. MER is for people doing residential, industrial, and commercial work. Simply, if you are a Master Sparky or work with electricity in any way, this reference guide is for you! Have you ever lost pages or had damaged pages in your pocket electricians reference? The solution is here: Use MER to keep the most important information easily accessible on your iPhone, iPod Touch, or iPad. MER will even do calculations for you; something your old pocket reference book can't do. MER is divided into the following sections: * Simple Circuits - Ohm's law, series and parallel circuits, capacitance, inductance, impedance, and reactance. * Distributed Systems - Distribution wiring diagrams for 120, 208, 277, and 480 volts, color codes, breaker sizes, light switches and bells diagrams. * Electrical Formulas - Formulas for kVA, kW, and HP. * Color Codes - Color codes for capacitors and resistors. * Motors and Wiring - Standard motor and motor starter sizes, tables of full-load currents, locked-rotor information, overload units, OCPD, nameplate information, synchronous motor speeds, three-phase STAR and DELTA diagrams, three-wire start-stop diagram, motor frame dimensions, and motor enclosure types. * Transformers - KVA ratings for single- and three-phase current, transformer formulas. * Conductor Properties - Conductor tables, AWG and metric wire sizes, twist-on pressure connectors, and wire combinations. * Ampacities - Ampacities in raceway, cable, earth, and free air, and derating tables. * Conduit Fill table * Grounding Sizes - Equipment grounding conductor (EGC) and grounding electrode conductor (GEC). * Metal Boxes - Images and sizes of metal boxes, junction / device boxes, junction / pull boxes. * Voltage Drop calculations * Dictionary of electrician terms * Insulation Charts - Table of cable and wire types * Electrical Symbols * NEMA - Plugs and wiring diagrams, enclosure types, standard underground boxes, standard fuse and breaker sizes, standard pull box / junction sizes, standard gutter and wire-ways, standard switchboards, standard busway, standard busbar ampacity, standard panelboard sizes, and standard disconnect sizes. * Math and Conversions - Formulas for algebra, geometry, fractions, temperature conversion, trig tables, unit conversions, metric prefixes, and conversions between inches and millimeters. * Conduit Bending - Includes the guide "The Master Bender Way" on how to bend conduit. See the Master Bender app or MasterBender.com website for more information. * Conduit Weights * Copper Wire Cost * Hole Saw Sizes * Material Raceway Support * Lighting - Fluorescent, high-intensity discharge, incandescent, LED, and low-pressure sodium. * Standard Tool List * Torque - Lugs, bolts, and screws, tightening torque. * Dry, Damp, and Wet Locations * Hazardous Locations * Wiring Methods * Safety - Lock-out / tag-out (LOTO), and a safety manual and first aid. Most pages contain a general scientific calculator. It is expression based: Just enter an expression and evaluate it. It understands trig and power functions, can convert between radians and degrees, and has built-in basic constants like pi and e. MER includes key NEC tables from the National Electrical Code (NEC) 2017. We also have MER apps available for NEC 2011 and NEC 2014 code years. Visit our website at MasterSparky.com for more information.

About

Subs

Features
Read full description

Subs is a simple subscription management tool that helps you track and manage all your subscription expenses. Whether it's streaming services, software subscriptions, or memberships, you can view and control everything in one place. Key Features Subscription Management • Add and edit subscription details: name, cost, billing cycle (weekly/monthly/yearly) • Support for recurring subscriptions and one-time purchases • Set start date and custom icons for each subscription • Stop subscriptions: keep records while excluding from cost calculations • Restore subscriptions: reactivate stopped subscriptions • Delete subscriptions: permanently remove unwanted records Cost Tracking • View daily, monthly, and yearly subscription totals in real-time • Cost summary cards for intuitive expense overview • Multi-currency support with automatic exchange rate conversion • Set different currencies for each subscription Up Next Feature • Clearly shows the next upcoming charge • Renewals listed in chronological order • Avoid forgetting to cancel unwanted trial subscriptions • Quickly view upcoming charges for the next few days Subscription List • Overview of all active subscriptions • Sort and filter by different criteria • Swipe left for quick actions: edit, delete • Swipe right for quick actions: stop, restore (for active recurring subscriptions only) • Tap to view subscription details Multi-Currency Support • Set individual currency for each subscription • Automatically calculate total across different currencies • Supports common currencies: USD, EUR, CNY, JPY, and more Data Privacy • All subscription data stored locally on your device only • No account registration or internet connection required • No collection or upload of any personal information • Completely offline usage Pro Version Features Upgrade to Pro to unlock advanced features: Unlimited Subscriptions • Free version has subscription limits • Pro version allows unlimited subscriptions Notification Reminders • Customizable renewal reminder notifications • Set reminder timing: 1 day, 3 days, 7 days in advance, etc. • Avoid unexpected charges and forgotten cancellations • Configure notification preferences for each subscription individually Advanced Analytics • Visual charts displaying subscription trends • View spending distribution by category • Track historical cost changes • Data-driven subscription optimization suggestions One-Time Purchase • Pro version uses a one-time payment model • Permanently unlocks all features after purchase • No additional subscription fees or hidden charges • Restore purchase support included Use Cases • Manage streaming subscriptions: Netflix, Disney+, Spotify, Apple Music, YouTube Premium, etc. • Track software subscriptions: Adobe Creative Cloud, Microsoft 365, Notion, etc. • Record membership services: gym memberships, iCloud storage, Amazon Prime, etc. • Monitor insurance and utilities: car insurance, home insurance, utility bills, etc. • Control subscription spending: understand monthly totals, optimize subscription portfolio How to Use Add Subscription 1. Tap the + button at the bottom 2. Enter subscription name and cost 3. Select billing cycle and currency 4. Set start date (optional) 5. Save subscription Edit Subscription • Swipe left in the subscription list and tap edit button • Or tap subscription card to view details, then edit Stop Subscription • Swipe right in the subscription list and tap stop button • Stopped subscriptions continue until the current billing cycle ends • No longer included in cost calculations afterward Delete Subscription • Swipe left in the subscription list and tap delete button • Permanently deleted after confirmation, cannot be recovered View Cost Statistics • Homepage top shows daily, monthly, and yearly totals • Up Next card displays upcoming renewals • Subscription list shows all active subscriptions

Screenshots

2017 Master Electrician Ref.4 screens
Subs4 screens

Verdict

The call

The clearest difference is price: Subs at Free against 2017 Master Electrician Ref.'s $9.99. Subs also leads on update cadence (every 2 weeks vs every 5 months). 2017 Master Electrician Ref.'s advantage is in-app purchases (none vs 1) and device support (3 vs 1). On ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Subs is free to download; 2017 Master Electrician Ref. costs $9.99 up front. Subs sells 1 one-off in-app purchase. 2017 Master Electrician Ref. asks for nothing beyond the download.

UpkeepUpdate frequency

2017 Master Electrician Ref. ships an update every 5 months, Subs every 2 weeks. The most recent releases landed on October 18, 2026 and October 17, 2026 respectively.

Scorecard5 real differences · 5 level
2017 Master Electrician Ref. versus Subs: the parameters behind the verdict, then further details
Parameter2017 Master Electrician Ref.Subs
Price$9.99Free — better
Rating4.7 (1.3K ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings1.3K — better—
Update frequencyEvery 5 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.0 — better18.6
Further details — not scored
Size46 MB2 MB
Age rating12+4+
DeveloperPawEng, LLC展 陆

Bugs and requests

2017 Master Electrician Ref.

Reported bugs

3 issues
  • Conduit fill information missing for certain types
  • Login screen freezes
  • Compatibility issues with older devices

Requested features

3 requests
  • Update to latest NEC code
  • Add calculation tools for conduit fill and voltage drop
  • Improve user interface and navigation

Subs

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

2017 Master Electrician Ref.

No in-app purchases

1 purchases

Subs

One-time1
  • Upgrade to Pro$1.99

Questions

Is 2017 Master Electrician Ref. free?
2017 Master Electrician Ref. costs $9.99, with no in-app purchases.
Is Subs free?
Subs is free to download, with in-app purchases available.
Do 2017 Master Electrician Ref. or Subs have ads?
Neither 2017 Master Electrician Ref. nor Subs shows ads.
Which is updated more often, 2017 Master Electrician Ref. or Subs?
2017 Master Electrician Ref. ships an update every 5 months, and Subs every 2 weeks. Most recently, 2017 Master Electrician Ref. was updated on October 18, 2026 and Subs on October 17, 2026.

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