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
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This electronic pocket reference guide provides essential information for electrical professionals. It offers calculations, code tables, and detailed sections on motors, ampacities, grounding, and more, all accessible on your mobile device.

Harbor Freight Tools#3

Harbor Freight Tools by Harbor Freight Tools USA, Inc.

Harbor Freight Coupons
Worth Considering
🛍️ Shopping
4.8😊(216K ratings)
Free
#90in Shopping
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Discover the latest coupons, instant savings, and exclusive deals for members. Browse tools, check local stock, and create wish lists. Scan barcodes in-store for more product information.

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

This digital platform helps manage tools and equipment by providing an inventory program and tracking capabilities. It allows users to log purchase information, set service reminders, and track tool locations to prevent theft and tampering.

Digital tool inventoryTrack tool locationService reminders
📊 Productivity
(7.7K)
free with in-app purchases
5
RYOBI
RYOBI
RYOBI
All-in-one tool management app
Free

Manage, monitor, and maximize your tools with this app. Register new purchases, track connected tools, and explore the product catalog. Access manuals, warranty information, and find nearby retailers.

Product registration with OCR and barcode scanningMonitor and manage connected toolsView tool status and metrics
🔧 Utilities
(13K)
free with in-app purchases
6
Toolbox - Smart Meter Tools
Toolbox - Smart Meter Tools
Toolbox - Smart Meter Tools
Best Measuring Tool Box App
Free

Transform your device into a versatile toolkit with a comprehensive suite of measuring instruments. This app offers a metronome, stopwatch, timer, ruler, level, and various sensors to assist with a wide range of tasks.

MetronomeStopwatchTimer
🔧 Utilities
(14K)
free with in-app purchases
7
VEVOR Home Improvement Tools
VEVOR Home Improvement Tools
VEVOR Home Improvement Tools
Tougher Tools, Better Prices
Free

This platform offers a wide selection of tools and equipment for home improvement and DIY projects. Browse millions of quality products, enjoy exclusive deals, and benefit from fast delivery and a hassle-free return policy. Get tough equipment at affordable prices for all your building needs.

Wide product selectionEasy navigation by categoryHigh-definition product photos/videos
🛍️ Shopping
(4.2K)
free with in-app purchases
8
Electrical Code-A-Day
Electrical Code-A-Day
Electrical Code-A-Day
Quiz for Electricians
Free

Test your electrical knowledge daily with a new question based on the US electrical code. Perfect for apprentices, journeymen, and masters seeking to learn or refresh their understanding of electrical concepts and regulations.

Daily electrical code questionsQuestions written by a real electricianCovers a wide range of electrical topics
📊 Productivity
(8.6K)
free
9
AutoCAD
AutoCAD
AutoCAD
DWG Viewer & Editor
Free

Access and edit CAD drawings on the go with this official application. It provides essential drafting and design tools for creating, updating, and sharing 2D drawings from any device. Collaborate with teams and simplify workflows by accessing files from various cloud storage services.

2D file viewingCreate, edit, and share 2D drawingsOffline work and sync
📊 Productivity
(6.3K)
freemium
10
Mike Holt's Electrical Toolbox
Mike Holt's Electrical Toolbox
Mike Holt's Electrical Toolbox
Electrical Power Calculator
Free

This app provides essential calculations for electricians, inspectors, contractors, and engineers. It helps determine conductor sizing, circuit protection, race sizing, and grounding conductor sizes for various electrical equipment and services.

Conductor sizingVoltage drop limitationsCircuit protection sizing
🔧 Utilities
(197)
free
11
Learn Electrical Engineering
Learn Electrical Engineering
Learn Electrical Engineering
by Pollmine.Com
Free

Master electrical engineering concepts with an AI-powered coach. Access bite-sized video lessons, quizzes, and personalized guidance to enhance your knowledge. Dedicate just 60 minutes weekly to achieve significant learning outcomes.

AI-driven coachBite-sized video lessonsQuizzes
📚 Education
(298)
free
12
Southwire® Conduit Fill Calc
Southwire® Conduit Fill Calc
Southwire® Conduit Fill Calc
by Southwire Company
Free

This tool assists electricians, engineers, and contractors in determining the correct conduit size based on NEC guidelines. It calculates conduit fill percentages and jam probability, saving time compared to manual calculations.

Conduit size calculationNEC fill percentagesJam probability
🔧 Utilities
(746)
free
13
Electrical Toolkit by HCP
Electrical Toolkit by HCP
Electrical Toolkit by HCP
Conduit + load calcs for pros
Free

This comprehensive mobile toolkit provides electricians and professionals with essential calculations, NEC-compliant tools, and field utilities. It offers features for conduit bending, fill calculations, load analysis, and various electrical calculators, all designed for speed and clarity.

Conduit bending calculationsNEC-compliant conduit fillResidential load calculations
🔧 Utilities
(18)
free
14
Greenworks Shopping
Greenworks Shopping
Greenworks Shopping
Shop Greenworks Battery Power
Free

Easily shop for outdoor power equipment and tools. Register your purchased items, explore accessories, and track your loyalty rewards. Discover app-exclusive sales and convenient payment options.

Shop outdoor power equipmentRegister toolsBrowse accessories
🔧 Utilities
(1.6K)
free
15
Electrician Handbook — Basics
Electrician Handbook — Basics
Electrician Handbook — Basics
Electric circuit, voltage, ohm
Free
$5.99 | 100% OFF

This app provides electricians, students, and installers with essential electrical theory, interactive diagrams, and practical calculators. It includes a community forum for users to share knowledge and seek advice, all accessible offline without ads or subscriptions.

Electrical theory topicsInteractive circuit diagramsCalculators and formulas
🔍 Reference
(965)
free
16
Ugly's Electrical References
Ugly's Electrical References
Ugly's Electrical References
by Informed Publishing
$12.99

This app provides electricians and electrical professionals with up-to-date digital information based on the National Electrical Code. It includes formulas, wiring diagrams, conduit bending guides, and calculators for various electrical calculations. The app is designed for on-the-job reference and works offline.

NEC 2026 updatesMathematical formulas and calculatorsConduit bending guide with videos
📊 Productivity
(1.5K)
paid
17
DWG FastView-CAD Viewer&Editor
DWG FastView-CAD Viewer&Editor
DWG FastView-CAD Viewer&Editor
* Support 2D/3D CAD formats
Free

This cross-platform CAD application allows users to view, edit, and create 2D and 3D designs on the go. It supports a wide range of file formats and offers advanced tools for precise drawing, measurement, and annotation, even offline.

View and edit 2D/3D CAD drawingsSupports over 40 3D drawing formatsAccurate measurement and annotation tools
📊 Productivity
(50)
free with in-app purchases
18
BIMx
BIMx
BIMx
Explore and Collaborate in BIM
Free

Explore and collaborate on architectural BIM projects with interactive 3D models and linked documentation. Visualize designs, access BIM data, and streamline communication between the construction site and office.

Interactive 2D & 3D BIM model explorationLinked 2D documentation and 3D viewsAccess BIM element data
📊 Productivity
(167)
free with in-app purchases
19
Engineering Unit Converter
Engineering Unit Converter
Engineering Unit Converter
by Vector 254 LLC
Free

This app offers a powerful and user-friendly way to convert units and currencies. It includes a built-in calculator, mass/mole fraction converter, thermocouple module, and physical constants database. Customize your display and input mathematical expressions for complex conversions.

Unit conversionCurrency conversionBuilt-in calculator
🔍 Reference
(83)
free with in-app purchases
20
Bosch Toolbox
Bosch Toolbox
Bosch Toolbox
Digital Tools for PROs
Free

This app provides digital tools for professional tradespeople to enhance efficiency. It offers features for tracking project time, calculating distances with a measurement camera, and converting units. Additionally, it allows for tool registration, repair inquiries, and dealer location.

Project time and journey trackingMeasurement camera for project dimensionsUnit converter for over 50 units
🔧 Utilities
(677)
free