VesBuddy vs Maritime Master
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VesBuddy
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VesBuddy is a robust platform for seafarers, harnessing cutting-edge technology to offer comprehensive support for seafarers' needs, addressing both personal and operational requirements. Designed and developed by a Seafarer for the Seafarer Community. VesBuddy attempts to equip Seafarers with powerful tools to make their lives a little easier. This app comes packed with exciting features that include: - Finance Manager: A collection of finance tools for seafarers to easily record and monitor their finances. - Currency Rates: A simple currency converter auto updates with the latest rates. - SeaTime Logger: Effortlessly track your sea time using this advanced digital module. - Doc Locker: Keep your documents safe and secure with our powerful locker. - Navigator: An integrated navigation system powered only by device sensors. - SeaSIM: An easy to use eSIM module tailored for Seafarer needs. This is just the beginning. I remain committed to improving VesBuddy and regularly adding new features to benefit the Seafarer Community. Please let me know if you have any suggestions for this app improvement. Privacy Policy: https://alangautham.dev/privacy-policy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Maritime Master
This app provides a comprehensive suite of 88 professional maritime calculators for navigation, celestial observation, tides, stability, weather, engineering, and more. It's designed for maritime professionals and enthusiasts, offering offline functionality and citing all formulas with their official sources.
- 88 professional maritime calculators
- Offline functionality
- Navigation calculations
- Celestial observation tools
- Stability and cargo calculations
- Unit converters
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CalcDeck is the complete calculation toolkit for life at sea. It brings 88 professional maritime calculators into one beautifully designed iOS app, covering navigation, celestial observation, tides, stability and cargo, weather, engineering, safety, commercial voyage work, yacht and small craft performance, regulatory compliance and unit conversion. Whether you are a Master Mariner, deck officer, marine engineer, maritime cadet, yacht skipper or weekend sailor, CalcDeck replaces a shelf of reference books, a scratch pad and a pocket full of single-purpose apps. Every formula is cited with its textbook or IMO source, so you can verify the working and trust the result. CalcDeck is built by Maritime Master, the team behind COLREG Master, Nav Lights and IALA Buoyage, and is engineered to the same professional standard trusted by cadets and officers worldwide. What is inside Navigation (12 calculators): great-circle and rhumb-line distance, course to steer, ETA, set and drift, three-point fix, running fix, dead reckoning, cross-track error, waypoint bearing, speed-time-distance, departure and DMP, Mercator sailing. Celestial (8 calculators): sight reduction, meridian passage, altitude corrections, sunrise, sunset and twilight times, Polaris latitude, compass error by amplitude, azimuth of the sun, and chronometer error. Tidal (6 calculators): tidal height by the rule of twelfths, secondary port corrections, tidal streams, height at a given time, time at a given height, and clearance under bridges. Stability and Cargo (9 calculators): GM and list, trim and draft survey, free surface correction, deadweight and displacement, cargo load, block coefficient, TPC and MCTC, and final draft after loading. Weather (6 calculators): true wind, apparent wind, relative humidity, dew point, Beaufort scale conversion, and barometric trend. Engineering (10 calculators): fuel consumption and ROB, daily fuel burn, propeller slip, shaft power, specific fuel consumption, bunker density correction, trim tank transfer, admiralty coefficient, engine load, and voyage fuel planning. Safety (5 calculators): distance off by vertical sextant angle, horizon distance, dipping range, turning circle, and stopping distance. Yacht and Small Craft (5 calculators): hull speed, sail area to displacement, displacement to length, capsize screening, and ballast ratio. Commercial and Voyage (6 calculators): voyage cost, laytime, demurrage, freight rate per tonne, charter economics, and port disbursements. Regulations and Compliance (6 calculators): MARPOL discharge limits, SOLAS LSA requirements, STCW rest-hour compliance, load line zones, ballast water exchange, and garbage record categorisation. Unit Converters (12 calculators, all free): distance, speed, temperature, pressure, volume, mass, area, power, energy, angle, time and fuel. Every unit a mariner needs. Why CalcDeck CalcDeck works fully offline, so there is no signal, no signup and no interruption when you need an answer at sea. It is a native SwiftUI app designed for iPhone and iPad on iOS 17 and later, with a clean navy and gold Maritime Master design, dark mode support, favourites, and a Calc Pad that lets you pin your most-used tools for instant access on watch. There are no advertisements, no tracking and no subscriptions. Free and Pro You can try CalcDeck at no cost. All 12 unit converters and a selection of essential calculators in every professional category are included free. Unlock the full 85-calculator suite with a single one-time in-app purchase that is yours forever across all your devices. Who it is for CalcDeck is used by deck officers and Masters on coastal and ocean passages, by marine engineers calculating fuel, power and performance, by maritime cadets preparing for OOW, Chief Mate and Master examinations, by yacht skippers and RYA students, by cruising sailors, by pilots, harbourmasters and port operations staff, and by naval architects, surveyors and marine consultants.
Screenshots
Verdict
The clearest difference is update cadence: Maritime Master at daily against VesBuddy's weekly. VesBuddy's advantage is iOS requirement (15.5 vs 17.6). On price, 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
Both are free to download. VesBuddy sells 1 one-off in-app purchase and Maritime Master sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
VesBuddy ships an update weekly, Maritime Master daily. The most recent releases landed on October 17, 2026 and October 14, 2026 respectively.
| Parameter | VesBuddy | Maritime Master |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (1 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Weekly | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.5 — better | 17.6 |
| Further details — not scored | ||
| Size | 130 MB | 7 MB |
| Age rating | 12+ | 9+ |
| Developer | Alan Rosario Gautham H | MARITIME MASTER LIMITED |
In-app purchases
VesBuddy
- SeaBuddy PRO$6.99
Maritime Master
- CalcDeck Pro$14.99








