# 2017 Master Electrician Ref. vs Mettle Inspect The clearest difference is price: Mettle Inspect at Free against 2017 Master Electrician Ref.'s $9.99. Mettle Inspect also leads on review sentiment (100% vs 67%) and update cadence (weekly vs every 5 months). 2017 Master Electrician Ref.'s advantage is ratings volume (1.3K vs 2) and iOS requirement (12.0 vs 16.4). On ads, in-app purchases and device support there is nothing between them. Mettle Inspect is free to download; 2017 Master Electrician Ref. costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay. Mettle Inspect holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: 2017 Master Electrician Ref. has 1.3K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 67% of 2017 Master Electrician Ref.'s written reviews are positive against 100% of Mettle Inspect's. 2017 Master Electrician Ref. ships an update every 5 months, Mettle Inspect weekly. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively. ## The numbers | Metric | 2017 Master Electrician Ref. | Mettle Inspect | | --- | --- | --- | | Price | $9.99 | **Free** | | Rating | [4.7 (1.3K ratings)](https://appshunter.io/ios/app/2017-master-electrician-ref/id1275949959/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/mettle-inspect/id6792928163/reviews)** | | Number of ratings | **1.3K** | 2 | | Positive reviews | 66.7% of reviews | **100.0% of reviews** | | In-app purchases | No | No | | Ads | No | No | | Update frequency | Every 5 months | **Weekly** | | Monetization | Paid | **Free** | | Size | 46 MB | 57 MB | | Requires iOS | **12.0** | 16.4 | | Devices | **iPhone, iPad, iPod** | iPhone, iPad | | Age rating | 12+ | 4+ | | Developer | [PawEng, LLC](https://appshunter.io/developer/390058606) | [KUVO LABS, LLC](https://appshunter.io/developer/6792928165) | ## What reviewers say ### 2017 Master Electrician Ref. [App page](https://appshunter.io/ios/app/2017-master-electrician-ref/id1275949959) 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:** macOS Compatibility, Vision Pro support **In-app purchases:** none **What reviewers like** - 👍 Quick reference - 🚀 Best app for electrical information - 🚀 Concise and well-laid out information - 🚀 Comprehensive electrical references **What reviewers complain about** - 🐛 App needs to be updated - 🐛 Inaccurate information in some areas - 🐛 Limited functionality compared to expectations - 🐛 Overlapping table of contents **Reported bugs** - Conduit fill information missing for certain types - Login screen freezes - Compatibility issues with older devices **Requested features** - Update to latest NEC code - Add calculation tools for conduit fill and voltage drop - Improve user interface and navigation ### Mettle Inspect [App page](https://appshunter.io/ios/app/mettle-inspect/id6792928163) This platform enables inspection organizations and their teams to manage and capture on-site inspection information. It allows for project management, detailed field inspections, and secure data synchronization with an organization's workspace. Capture visual evidence, record observations, and collaborate with team members, even with limited connectivity. **Highlights:** Project management, Field inspections, Picture documentation with annotations, Offline workflows, Team collaboration, Secure data synchronization **In-app purchases:** none ## Frequently asked questions ### Is 2017 Master Electrician Ref. free? 2017 Master Electrician Ref. costs $9.99, with no in-app purchases. ### Is Mettle Inspect free? Mettle Inspect is free to download, with no in-app purchases. ### Which has better reviews, 2017 Master Electrician Ref. or Mettle Inspect? Mettle Inspect is rated higher. 2017 Master Electrician Ref. averages 4.7 out of 5 from 1.3K ratings, while Mettle Inspect averages 5.0 from 2 ratings. ### Do 2017 Master Electrician Ref. or Mettle Inspect have ads? Neither 2017 Master Electrician Ref. nor Mettle Inspect shows ads. ### Which is updated more often, 2017 Master Electrician Ref. or Mettle Inspect? 2017 Master Electrician Ref. ships an update every 5 months, and Mettle Inspect weekly. Most recently, 2017 Master Electrician Ref. was updated on October 24, 2026 and Mettle Inspect on October 10, 2026. --- *Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*