Best Grtoolbox Apps

214+ iOS apps curated and reviewed

4.5 avg rating
19 free apps
Updated April 2026

Whether you're new to grtoolbox or looking for an upgrade, our curated collection of 214+ iOS apps has something for everyone. Each app is reviewed and rated by real users, helping you make an informed decision.

Top Picks for Grtoolbox

Master Electrician Ref. Lite#2

Master Electrician Ref. Lite by PawEng, LLC

A handbook for electricians
Strong Contender
📊 Productivity
4.7(2.4K ratings)
Free
Master Electrician Ref. Lite screenshot 1
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A comprehensive electronic pocket electrician reference guide for electrical professionals and enthusiasts, providing essential information, calculations, NEC tables, and safety manuals. Visit MasterSparky.com for more details and upgrade to the full version for extensive content covering NEC codes over various years.

Harbor Freight Tools#3

Harbor Freight Tools by Harbor Freight Tools USA, Inc.

Harbor Freight Coupons
Worth Considering
🛍️ Shopping
4.8😊(211K ratings)
Free
#80in Shopping
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Discover the latest coupons, deals, and exclusive offers with an app dedicated to tools and savings. Easily browse products, watch demos, check availability, and sync wish lists across devices. Join the Inside Track Club for even more discounts and stay informed about America's top retailer of quality tools at unbeatable prices.

What We Love

  • 🚀 Easy to use
  • 👍 Helpful customer service
  • 💡 Exclusive app-only deals
  • 🚀 Intuitive search

Room to Improve

  • 🐛 Constant logout issues
  • 🐛 Refreshes when switching apps
  • 🐛 Inaccurate in-store inventory

More Grtoolbox apps to explore

4
Milwaukee® ONE-KEY™
Milwaukee® ONE-KEY™
Milwaukee® ONE-KEY™
by Milwaukee Electric Tool, Corp.
Free

Introducing a revolutionary digital platform for tools and equipment, offering inventory management, tool tracking, and project-level organization. Streamline productivity and keep your tools secure and accessible with this innovative solution.

📊 Productivity
(1.1K)
5
RYOBI
RYOBI
RYOBI
All-in-one tool management app
Free

Effortlessly manage, monitor, and maximize your tools with our all-in-one tool management app. Stay updated with the latest product releases, manage connected tools, access warranty information, and explore the full product catalog. Simplify your tool management experience today!

🔧 Utilities
(13K)
6
Toolbox - Smart Meter Tools
Toolbox - Smart Meter Tools
Toolbox - Smart Meter Tools
Best Measuring Tool Box App
Free

Transform your iPhone or iPad into a versatile measuring device with 13 essential tools like a metronome, stopwatch, compass, and more. From measuring angles to checking surface levels, this toolbox app is a must-have for all your measurement needs. Download now for a convenient and comprehensive measuring experience.

🔧 Utilities
(14K)
7
VEVOR Home Improvement Tools
VEVOR Home Improvement Tools
VEVOR Home Improvement Tools
Tougher Tools, Better Prices
Free

Discover a diverse range of high-quality tools and home improvement products on a convenient shopping platform designed for all your DIY projects and household needs. From automotive tools to kitchen supplies and garden equipment, find everything you need for better prices. Start enhancing your home today.

🛍️ Shopping
(4.1K)
8
Electrical Code-A-Day
Electrical Code-A-Day
Electrical Code-A-Day
Quiz for Electricians
Free

Put your electrical knowledge to the test with this daily quiz app for electricians! Answer a new question each day or binge-answer them all at once. Perfect for apprentices, journeymen, and masters looking to sharpen their skills or refresh their knowledge. Lightning-fast learning on all things electrical!

📊 Productivity
(8.6K)
9
AutoCAD
AutoCAD
AutoCAD
DWG Viewer & Editor
Free

View and edit AutoCAD drawings on the go! Access all DWG files, annotate, measure, and share designs easily. Download now to streamline your workflow.

📊 Productivity
(6.3K)
10
Mike Holt's Electrical Toolbox
Mike Holt's Electrical Toolbox
Mike Holt's Electrical Toolbox
Electrical Power Calculator
Free

An industry-leading electrical power calculator app designed by Mike Holt for electricians, inspectors, contractors, and engineers. Perform conductor sizing, circuit protection, race sizing, and more with this practical and useful tool.

🔧 Utilities
(198)
11
Learn Electrical Engineering
Learn Electrical Engineering
Learn Electrical Engineering
by Pollmine.Com
Free

Learn Electrical Engineering with the help of an AI-driven coach through bite-sized videos, quizzes, and personalized guidance. Spend just 60 minutes a week to enhance your knowledge and skills in Electrical Engineering and related fields.

📚 Education
(298)
12
Southwire® Conduit Fill Calc
Southwire® Conduit Fill Calc
Southwire® Conduit Fill Calc
by Southwire Company
Free

This application helps electricians, engineers, and contractors quickly determine the proper conduit size to use based on NEC guidelines, including fill percentages and jam probability. Simply input conduit type, size, and conductors, and the app will calculate the conduit fill percentage for you.

🔧 Utilities
(679)
13
Electrical Toolkit by HCP
Electrical Toolkit by HCP
Electrical Toolkit by HCP
Conduit + load calcs for pros
Free

A comprehensive electrical calculator and conduit bending tool designed for professionals, providing common calculations and conversions in a clean and simple interface for efficient work. Download it to streamline your electrical work and stay ahead with upcoming updates adding more tools.

🔧 Utilities
(18)
14
Greenworks Shopping
Greenworks Shopping
Greenworks Shopping
Shop Greenworks Battery Power
Free

Explore a one-stop shop for eco-conscious living with an app that offers a range of outdoor, indoor, and lifestyle products. Shop sustainably, enjoy secure purchases, and exclusive deals while simplifying your shopping experience. Download now to embrace a greener lifestyle.

🔧 Utilities
(1.6K)
15
Electrician Handbook — Basics
Electrician Handbook — Basics
Electrician Handbook — Basics
Electric circuit, voltage, ohm
Free
$5.99 | 100% OFF

An essential Electrician's Handbook for learning electrical theory, circuits, and calculations, suitable for beginners, amateurs, and professionals in the field. Featuring theory explanations, interactive circuit diagrams, calculators, and practical installation guides. Improve your electrical knowledge and skills with this comprehensive manual.

🔍 Reference
(965)
16
Ugly's Electrical References
Ugly's Electrical References
Ugly's Electrical References
by Informed Publishing
$12.99

This app is a comprehensive electrical reference guide that has been updated to align with the 2020 National Electrical Code. It offers a range of features such as calculators, interactive tools, and in-depth information for electricians, making it a valuable on-the-job resource.

📊 Productivity
(1.4K)
17
DWG FastView-CAD Viewer&Editor
DWG FastView-CAD Viewer&Editor
DWG FastView-CAD Viewer&Editor
* Support 2D/3D CAD formats
Free

DWG FastView-CAD Viewer allows users to view, edit, and share CAD drawings on mobile devices with ease. This intuitive app enables quick access to important design files anytime, anywhere. Access professional-grade features on-the-go and streamline your CAD workflow today.

📊 Productivity
(50)
18
BIMx
BIMx
BIMx
Explore and Collaborate in BIM
Free

Explore and collaborate on architectural design projects seamlessly with an interactive app offering professional building visualization and game-like navigation. Download now to access the BIMx hyper-model, connect construction sites with architects' offices, and enhance on-site collaboration.

📊 Productivity
(167)
19
Engineering Unit Converter
Engineering Unit Converter
Engineering Unit Converter
by Vector 254 LLC
Free

This powerful unit and currency converter app allows users to easily convert between various units, perform calculations, and access physical constants, all with a customizable and user-friendly interface. With its versatile features, including a built-in calculator and conversion tools for mass fractions, mole fractions, and thermocouples, users can streamline their workflow and boost productivity - try it out today!

🔍 Reference
(83)
20
Bosch Toolbox
Bosch Toolbox
Bosch Toolbox
Digital Tools for PROs
Free

Access a collection of innovative digital tools designed for professional tradespeople in construction, electrical work, gardening, and more with the free Bosch Toolbox app. Enhance your efficiency and productivity on the job with this comprehensive set of tools tailored to meet your specific needs.

🔧 Utilities
(677)