Comparison

Marshal vs ConvertPro

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

Head to head
About

Marshal

This utility app leverages NFC technology to quickly commission, clone, diagnose, and monitor drives. It offers guided diagnostics, parameter backup and restore, and secure access to drive configurations. Easily share configurations and activate extended warranties.

Highlights
  • NFC-enabled drive commissioning
  • Parameter cloning and backup
  • Guided diagnostics for drive issues
  • Offline configuration creation
  • Configuration sharing via multiple platforms
  • 5-year warranty activation
  • Drive status monitoring and security
Read full description

Marshal is your drive expert in the field and allows you to commission, clone, diagnose issues, and monitor the drive in just a few screen taps. Easy to use, Marshal gets your drive up and running in under 60 seconds. Powered by Near Field Communication (NFC) technology, simply connect to the drive by placing your mobile device close to the NFC logo. Data transfer takes less than 0.5s. Marshal supports you with: Commissioning • Power off or on commissioning (even in the box) • FastStart – assisted commissioning. Only 4 simple steps to get you up and running • Advanced features available in parameter setting • Pre-set application configurations Cloning • Parameters can be easily transferred from one drive to another - just tap to write as many drives as you want • Back-up and restore the configuration via the app Share • Share configuration via Outlook, OneDrive, WhatsApp etc. • Shared configurations are compatible with Marshal & Connect (our PC commissioning tool) • Export configuration to PDF format Offline capabilities • Create new configurations in the app • Open existing projects to review/change parameters Diagnostics • Guided diagnostics for the system even without drive alarms or trips • Diagnostics available with power off or on • Get support with drive alarms within the app • Error log & active error diagnostics – view active and historical error info • Differences from default – compare configuration against factory defaults Registration • Activate the 5 Year Warranty via the app • Access & download support materials via your CT account Monitoring and security • Quick view of parameter settings & drive status • Restrict access to drive configuration via PIN • Quick visualisation of I/O, motor, and speed settings

About

ConvertPro

Features
Read full description

Get the measurement. Get the answer. Get back to work. ConvertPro is a measurement toolkit for people who work with their hands — trades, technicians, makers and engineers. It opens on the converter, takes fractions the way you actually write them, and works with no signal at all. FRACTIONS DONE PROPERLY Type 7 3/8 and get 187.325 mm — not 187.3. Tap a fraction key instead of hunting for a decimal. Convert back the other way and see the nearest 1/2 through 1/64, with exact matches marked so a rounded fraction never pretends to be exact. COMPOUND MEASUREMENTS 5' 8", 2 lb 8 oz and 2h 35m are single measurements, and ConvertPro reads and writes them that way. 68 inches comes back as 5 ft 8 in. A KEYPAD BUILT FOR MEASURING Big keys, a fraction slash, a space for mixed numbers, and one-tap fraction shortcuts. No fighting a phone keyboard for a slash. BUILT FOR YOUR TRADE Choose Construction, Electrical, Plumbing, HVAC, Woodworking, Mechanical, Engineering or Cooking — or several. The categories and tools you need come first. PROFESSIONAL CALCULATORS Concrete volume, flooring with waste, paint coverage, slope and grade, board feet, lumber sizes, Ohm's law, AWG wire gauge, voltage drop, pipe volume, duct airflow and recipe scaling. Calculators are clearly marked as calculators. Each one states its assumptions, because an estimate is not a code compliance check. ACCURATE ON PURPOSE Imperial and metric conversions use the exact factors from the 1959 international yard and pound agreement — one inch is exactly 25.4 mm. Pressure, force, torque, power and energy follow SI definitions. Temperature converts affinely, so °C, °F, K and °R all round-trip exactly. AWG figures are computed from the defining formula rather than copied from a table. All of it is covered by an automated test suite. WORKS OFFLINE. ALWAYS. Every conversion, calculator, widget and Shortcut runs on your device. The unit database is inside the app. Airplane Mode changes nothing. PRIVATE BY DESIGN No account. No sign-in. No analytics, no advertising, no third-party SDKs, no tracking of any kind. Your measurements, history, favorites and projects never leave your device. Conversion history can be switched off entirely. ALSO INCLUDED • Widgets for the Home Screen and Lock Screen • Siri Shortcuts and App Intents that convert without opening the app • Favorites, searchable history and projects • Search that answers "10 ft to m" as you type • Full VoiceOver, Dynamic Type, Reduce Motion and Voice Control support • Light and dark themes, both deliberately designed • Eight languages: English, French, Spanish, German, Italian, Portuguese (Brazil), Dutch and Polish FREE FOREVER Length, area, volume, mass, temperature, speed and time conversions. Favorites, history, offline use, and the fraction tool. No ads, and no limit on how much you convert. CONVERTPRO PRO — ONE PAYMENT Every trade mode, all seventeen professional tools, the advanced categories (pressure, torque, flow, density, viscosity, thermal and the full electrical set), projects, advanced precision and fraction denominators, and the widgets. Bought once, not rented. Family Sharing included. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Marshal4 screens
ConvertPro4 screens

Verdict

The call

The clearest difference is in-app purchases: Marshal at none against ConvertPro's 1. Marshal also leads on iOS requirement (15.0 vs 18.0). On price, update cadence, ads 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

Both are free to download. ConvertPro sells 1 one-off in-app purchase. Marshal asks for nothing beyond the download.

UpkeepUpdate frequency

Marshal ships an update every 2 months, ConvertPro monthly. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 7 level
Marshal versus ConvertPro: the parameters behind the verdict, then further details
ParameterMarshalConvertPro
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 2 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.0 — better18.0
Further details — not scored
Size241 MB5 MB
Age rating4+4+
DeveloperControl Techniques LimitedAdemola Mayowa Olatunji

In-app purchases

None

Marshal

No in-app purchases

1 purchases

ConvertPro

One-time1
  • ConvertPro Pro$4.99

Questions

Is Marshal free?
Marshal is free to download, with no in-app purchases.
Is ConvertPro free?
ConvertPro is free to download, with in-app purchases available.
Do Marshal or ConvertPro have ads?
Neither Marshal nor ConvertPro shows ads.
Which is updated more often, Marshal or ConvertPro?
Marshal ships an update every 2 months, and ConvertPro monthly. Most recently, Marshal was updated on October 29, 2026 and ConvertPro on October 31, 2026.

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