Box Fill 2 vs Building Wire Selector
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Box Fill 2
This utility app helps electricians and contractors perform precise electrical box fill calculations according to the latest codes. It also includes a comprehensive construction calculator for dimensional math, area, volume, and right-angle solutions.
- Electrical box fill calculations
- Construction calculator
- Dimensional math (feet-inches-fractions, metric)
- Area and volume calculations
- Right-angle solutions
- Shareable calculation reports
- iCloud sync across devices
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Box Fill 2: Electrical & Construction Calculator Stop guessing and start calculating with confidence. Box Fill 2 is the ultimate pro-grade utility for electricians, contractors, and engineers. Designed to streamline your workflow from the office to the job site, it combines a precision electrical box fill calculator with a full-featured construction calculator in one powerful, intuitive interface. EXPERT ELECTRICAL CALCULATIONS Stay compliant and safe with box fill calculations based on the latest standards, including the 2024 Canadian Electrical Code (CEC) and the 2023 National Electrical Code (NEC). Complete Fill Schedules: Create and save an unlimited list of calculations for entire projects. Advanced Device Logic: Automatically handles standard devices and "bulky" equipment (like smart dimmers or GFCIs) using the specific depth-based volume math required by the CEC. Detailed Conductor Tracking: Easily account for insulated conductors, bare grounds (with the NEC "4-ground" rule), internal clamps, and wire nuts. Custom Box Support: Use standard trade sizes or enter custom dimensions for specialized enclosures. Share & Export: Print directly from the app or share professional calculation reports via email or messaging to inspectors and team members. FULL CONSTRUCTION CALCULATOR No more switching between apps. Box Fill 2 includes a robust construction math engine designed for the trades. Dimensional Math: Work directly in feet-inches-fractions or metric units with seamless conversions. Area & Volume: Quickly solve for square footage and cubic volume for materials like concrete, drywall, and paint. Right-Angle Solutions: Instantly calculate rafters, slopes, and square-ups for precise layouts. History & Memory: Access previous calculations and save frequently used values to save time on repetitive tasks. MODERN & PROFESSIONAL FEATURES Universal Compatibility: Buy once and use on your iPhone, iPad, and Mac. iCloud Sync: Your project data stays up-to-date across all your devices automatically. Dark Mode Support: Optimized for high visibility in low-light job site conditions. Clean Interface: Ad-free, professional UI designed for speed and clarity under pressure. Put your pencil down and upgrade your toolkit. Download Box Fill 2 today.
Building Wire Selector
This tool helps determine the correct conductor size and wire type for electrical installations. It adheres to the National Electrical Code® wiring methods, ensuring compliance and safety.
- Conductor size determination
- Wire and cable type selection
- National Electrical Code compliance
- Electrical installation guidance
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Southwire's Building Wire Selector determines the minimum conductor size and the best wire and cable type for a particular installation, following the National Electrical Code® wiring methods.
Screenshots
Verdict
The clearest difference is review sentiment: Building Wire Selector at 100% against Box Fill 2's 33%. Building Wire Selector also leads on price (Free vs $3.99) and rating (5.0 vs 3.3). Box Fill 2's advantage is update cadence (every 5 weeks vs every 5 months). 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
Building Wire Selector is free to download; Box Fill 2 costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Building Wire Selector holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews point the same way: 33% of Box Fill 2's written reviews are positive against 100% of Building Wire Selector's.
Box Fill 2 ships an update every 5 weeks, Building Wire Selector every 5 months. The most recent releases landed on August 27, 2026 and August 30, 2026 respectively.
| Parameter | Box Fill 2 | Building Wire Selector |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 3.3 (3 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 33.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 — better | 2 |
| Update frequency | Every 5 weeks — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 16.6 — better |
| Further details — not scored | ||
| Size | 19 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Snappy Appz Inc. | Southwire Company |
Customer experience
Box Fill 2
Building Wire Selector
In-app purchases
Box Fill 2
No in-app purchases
Building Wire Selector
No in-app purchases
Questions
Is Box Fill 2 free?
Is Building Wire Selector free?
Which has better reviews, Box Fill 2 or Building Wire Selector?
Do Box Fill 2 or Building Wire Selector have ads?
Which is updated more often, Box Fill 2 or Building Wire Selector?
Other comparisons
