Box Fill Calc vs Kopperfield
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Box Fill Calc
This app simplifies electrical box fill calculations for any job size. It allows users to create and save unlimited calculations, solve for various box sizes, and export results to spreadsheets or print directly. It supports current electrical code standards and includes a built-in construction calculator.
- Unlimited saved calculations
- Solve for custom and compound boxes
- Export results to spreadsheet
- Direct printing via AirPrint
- Supports 2014 NEC and 2012
- Built-in construction calculator
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Box Calc is a fast, easy way to create a schedule of box fill calculations for any size of job or just to perform a single calculation on the fly. Put your pencil down and start making professional, consistent calculations today. - Universal app allows use on both iPad, and iPhone/iPod with single purchase. - Create an unlimited list of calculations that automatically save. - Solve for any size box including custom and compound. - Export your results to a spreadsheet for formatting or printing. - Print directly from the app (requires AirPrint printer). - Support for 2014 NEC and 2012. Built in construction calculator allows intermediate calculations to be performed within the app.
Kopperfield
Streamline electrical design and permitting with powerful tools for load calculations, panel schedules, and single-line diagrams. Quickly reference the National Electrical Code with an AI-powered chatbot and generate instant PDF reports for inspectors and clients.
- Load calculator with NEC standards
- Single line diagram tool
- Panel schedule creation
- NEC chatbot
- Instant PDF report generation
- AI panel photo processing
- Team dashboard
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Save time and money. Get ready for permits and projects with faster and easier design tools from Kopperfield, including load calcs, line diagrams, panel schedules, and more. Once logged into your Kopperfield account, you'll enjoy our: * Load calculator: Easy-to-use interface pre-loaded with common appliances and their standard output values from the National Electrical Code. Add information on the property and your calculation will automatically update. Supports both commercial and residential calculations, as well as the Standard (NEC Article 220 Part III), Optional (NEC Article 220 Part IV), and 2026 Standard (NEC Article 120 Part III) methods. * Single line diagram tool: Contains dozens of common templates and electrical symbols to make it easy to generate new diagrams and share them with your team. View diagrams from any device and create new templates on tablet or desktop for your whole team to use. * Panel schedules: Includes tools to complete panel schedules and create labels for electrical panels. Drag-and-drop interface makes it easy to arrange and customize circuits for both split-phase and three-phase projects. * NEC chatbot: Custom chatbot with advanced search capabilities to quickly reference specific sections of the 2017, 2020, or 2023 National Electrical Code. Includes the following features: * Fast PDF outputs: instantly generate a downloadable, one-page PDF report of your load calc, line diagram, or panel schedule to share with inspectors and customers * Smart property data: enter the property address and we’ll pull in the square footage for any customer project or electrical load calculation * AI panel photo processing: upload a photo of an electrical panel to automatically add items to your load calculation or panel schedule * Team dashboard: store your team's projects and documents in one place for easier management, access, and review *Single and three phase options: use a variety of nominal voltages for residential and commercial building types, including: 120/240V, 120/208V, 120/240V, 208Y/120V 3Ø, 240V 3Ø Delta, 240V 3Ø Hi-leg Delta, 347V 3Ø Delta, 480Y/277V 3Ø, 480V 3Ø Delta, 600Y/347Y 3Ø, 600V 3Ø Delta. * Standard scenarios: generate load calcs for scenarios including single family homes (standard and optional methods), multi dwelling units (i.e., duplex, triplex, quad), 120/208v (three-phase power) dwellings, accessory dwelling units and additions, commercial occupancy types, and heat pumps * Common appliance defaults: choose from a pre-loaded list of common appliances and standard output values that you can adjust for every load calculation * EV charger inputs: include EV charger values to any load calculation, essential for modern homes
Screenshots
Verdict
The clearest difference is review sentiment: Box Fill Calc at 60% against Kopperfield's 0%. Box Fill Calc also leads on iOS requirement (8.0 vs 15.1). Kopperfield's advantage is price (Free vs $4.99) and rating (3.8 vs 3.2). On ratings volume, ads, in-app purchases and device support 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
Kopperfield is free to download; Box Fill Calc costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Kopperfield holds the better App Store score, 3.8 against 3.2. Both are backed by a comparable volume of ratings — 5 and 11 respectively. Written reviews complicate that: 60% of Box Fill Calc's written reviews are positive against 0% of Kopperfield's, so the app with the better star average is not the one people write more warmly about.
Box Fill Calc ships an update every 3 months, Kopperfield fortnightly. Both last shipped on October 24, 2026.
| Parameter | Box Fill Calc | Kopperfield |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 3.2 (5 ratings) | 3.8 (11 ratings) — better |
| Positive reviews | 60.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 5 | 11 — better |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 18 MB | 64 MB |
| Age rating | 4+ | 4+ |
| Developer | Snappy Appz Inc. | Kopperfield, Inc. |
Customer experience
Box Fill Calc
Kopperfield
In-app purchases
Box Fill Calc
No in-app purchases
Kopperfield
No in-app purchases
Questions
Is Box Fill Calc free?
Is Kopperfield free?
Which has better reviews, Box Fill Calc or Kopperfield?
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Which is updated more often, Box Fill Calc or Kopperfield?
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