Comparison

DC Wire Sizer vs AirmarCAST™

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DC Wire Sizer

Calculate appropriate DC wire sizes for electrical projects, preventing equipment damage and fires. Save, edit, and export wire run details for electrical plans and material purchases. Features a wizard for easy sizing for all users.

Highlights
  • Calculates wire size, voltage drop, and ampacity
  • Supports custom DC voltages up to 500 amps
  • Save, edit, and export wire run details
  • Sizer Wizard for easy calculations
  • Select marine standards (ABYC or ISO)
  • Choose from various wire types and insulation ratings
Features
Currently charting
Read full description

Adding accessories (bilge pumps, electronics, solar, etc.) or upgrading batteries (AGM, Li, etc.) this year?  The #1 Cause of Boat and RV fires is DC wiring!  Undersized wires can damage equipment or cause fires.  The top-rated DC Wire Sizer calculates wire size for any DC voltage (ideal for solar in series). Plus lets you SAVE, EDIT, SUM, EMAIL and EXPORT the wire runs and material for your electrical plan, wire purchases, work orders, and records. And the Sizer Wizard option makes wire sizing easy for EVERYONE! Fast and safe wire sizing calculator for your next DC wiring project (battery, charger, inverter, trolling motor, stereo, and more). Designed with and for Marine Electronics Installers, Repair Services, Boat Builders, Surveyors, Do-It-Yourselfers, and Boat Owners. ONLY DC WIRE SIZER OFFERS these FEATURES: - Select any DC voltage and up to 500 amps - Results display wire size, VOLTAGE DROP (VD), and AMPACITY! - More granular “What if” analysis of ampacity & VD based on wire sizes & length - Choose from three methods of entering wire lengths for fast entry including separate positive/negative wire lengths (when different or negative is contact grounded, like a starter) - SAVE Wire Runs with the option to select or enter Wire Run & Project Name, wire type, wire color, status, and material source (Inventory or Buy) - EDIT Wire Runs including wire length, amps/watts, max voltage drop, insulations, inside/outside engine room, bundle, and the fields above. - SUMs active wire run lengths by size, type, and color to make purchasing easier and less expensive when by the reel (25’, 50’, 100’, etc.) - Select from a wire type list (e.g., primary, battery, safety, flat, duplex, triplex, mast, twisted, bilge, trailer, and solar cable) - Select marine standards (ABYC or ISO) - Change Unit of Measurement (Feet or Meters) in existing Wire Runs - Easy to use Sizer Wizard - Email and Export of Wire Runs and Raw Material MORE FEATURES: - Set default Wire Gauge (AWG, SAE, or MM2) - Set default Unit of Measure (feet or meters) - Select or enter Maximum Voltage Drop % - Select Bundle Size (1, 2-3, 4-6, 7-24, and 25+) - Select Insulation rating (60°, 75°, 80°, 90°, 105°, 125°, and 200°C) - Tap Inside/Outside Engine Room - Spin Amp/Watts and Wire Length for fast entry - Built-in Help and Technical Reference includes installation tips, connector types, color codes, tables (Voltage Drop, Ampacity, & Bundle), formulas (Power Triangle, Ohm's Law, etc.), recommended tools/books, and more. HERE’S WHAT REVIEWERS ARE SAYING: "The DC Wire Sizer is the most complete and comprehensive marine DC wire-sizing tool available. Developed for both marine professionals (the Wire Sizer Pro) and the occasional tinkerer (the Wire Sizer Wizard), the app determines the proper wire size, along with the voltage drop and ampacity by using the ABYC E-11 or ISO 10133 formulas and tables.” -  OnboardOnline (2013) "Stay organized by adding a wire description to the wire run and assign it to a project name (ie boat name, owner or work order). Mark the wire run as "Complete" or “Cancelled”, re-order wire runs within a project or move them between projects. Tired of adding wire runs in order to figure out what to purchase and how much? DC Wire Sizer sums the active wire runs for you by wire size (e.g. 8 AWG) and type (e.g. Safety Duplex, Battery Cable, and Primary Wire).” - marinabusiness (AU 2013) "If you're doing a lot of wiring on your boat, the app allows you to save the calculations with project names and wire type.  The app then can sum the length of the wire runs by wire type and size which can be used as a shopping list for your projects.  No other app offers these unique features and that's what makes it a winner.”  - i-marineapps (2013) "This is the best wire sizer program I have seen to date.  I can size and make a list at the same time also there is a better selection of amps and volts.” - Keith Herridge, Special Projects, Lyman-Morse Boatbuilding

About

AirmarCAST™

Configure and calibrate your boat's Bluetooth-enabled multisensors and modules directly from your mobile device. View real-time data on detailed gauges and perform advanced calibrations for speed, temperature, and attitude without extra hardware.

Highlights
  • Bluetooth sensor connection
  • Real-time data display
  • Intuitive navigation
  • Speed, temperature, attitude calibration
  • On-board GPS speed comparison
  • Advanced speed calibration wizards
Features
Read full description

Airmar® CAST™ connects to the Bluetooth®-enabled DST810, DX900+, WX300 multisensors and SmartBoat® modules on your boat, making sensor configuration and calibration easy with intuitive app navigation and real-time data from your multisensor. View data on detailed gauges and digital data screens, and perform speed, temperature, and attitude calibrations without the need for additional converters or cables. With CAST, you can configure your multisensor directly, regardless of the other displays and gauges on board. All data configurations and calibrations are stored in the multisensor and delivered on the NMEA2000® network. When used with DST810, you can calibrate basic or heel-compensated speed through water using your on-board GPS speed for comparison. Intuitive wizards guide you through multiple runs to correct for current. Or take it a step further to advanced speed calibration, with up to five heel angles and ten reference speeds. Until now, advanced speed calibration was only possible through expensive PC based software. With Airmar’s SmartBoat® modules, the CAST app delivers the fastest connection to the SmartView software for system configuration.

Screenshots

DC Wire Sizer4 screens
AirmarCAST™4 screens

Verdict

The call

The clearest difference is review sentiment: DC Wire Sizer at 100% against AirmarCAST™'s 25%. DC Wire Sizer also leads on rating (5.0 vs 2.6) and chart position (#194 vs unranked). AirmarCAST™'s advantage is price (Free vs $2.99) and update cadence (every 3 months vs every 20 months). On 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

CostPrice · In-app purchases · Ads · Monetization

AirmarCAST™ is free to download; DC Wire Sizer costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

DC Wire Sizer holds the better App Store score, 5.0 against 2.6. Both are backed by a comparable volume of ratings — 23 and 5 respectively. Written reviews point the same way: 100% of DC Wire Sizer's written reviews are positive against 25% of AirmarCAST™'s.

UpkeepUpdate frequency

DC Wire Sizer ships an update every 20 months, AirmarCAST™ every 3 months. The most recent releases landed on August 24, 2026 and September 8, 2026 respectively.

Scorecard8 real differences · 3 level
DC Wire Sizer versus AirmarCAST™: the parameters behind the verdict, then further details
ParameterDC Wire SizerAirmarCAST™
Price$2.99Free — better
Rating5.0 (23 ratings) — better2.6 (5 ratings)
Positive reviews100.0% of reviews — better25.0% of reviews
Number of ratings23 — better5
Update frequencyEvery 20 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#194 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better16
Further details — not scored
Size21 MB112 MB
Age rating4+4+
DeveloperDirty Dog Software, LLCAirmar Technology Inc.

Customer experience

DC Wire Sizer

All ratings23 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews14 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

AirmarCAST™

All ratings5 ratings
Positive40.0%
Neutral0.0%
Negative60.0%
Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

In-app purchases

None

DC Wire Sizer

No in-app purchases

None

AirmarCAST™

No in-app purchases

Questions

Is DC Wire Sizer free?
DC Wire Sizer costs $2.99, with no in-app purchases.
Is AirmarCAST™ free?
AirmarCAST™ is free to download, with no in-app purchases.
Which has better reviews, DC Wire Sizer or AirmarCAST™?
DC Wire Sizer is rated higher. DC Wire Sizer averages 5.0 out of 5 from 23 ratings, while AirmarCAST™ averages 2.6 from 5 ratings.
Do DC Wire Sizer or AirmarCAST™ have ads?
Neither DC Wire Sizer nor AirmarCAST™ shows ads.
Which is updated more often, DC Wire Sizer or AirmarCAST™?
DC Wire Sizer ships an update every 20 months, and AirmarCAST™ every 3 months. Most recently, DC Wire Sizer was updated on August 24, 2026 and AirmarCAST™ on September 8, 2026.

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