Calculator vs MyVessel
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator
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This new calculator has been designed to help you make preliminary calculations in the early stages of designing your armour. It is based on Hudson's internationally recognized formula for designing armour units. Our specialists are committed to sharing CLI's experience with construction companies right from the start of a project, in order to develop the most appropriate tools and methods. As a leader in breakwater protection technologies, CLI offers reliable, cost-effective and durable single-layer solutions to meet the challenges of climate change. CLI is a company fully dedicated to the transfer of single-layer technologies for port structures and for coastal protection. The ACCROPODE™ block and its improved version ACCROPODE™ II, the ECOPODE™ block as well as the CORE-LOC™ block remain market leaders in terms of reliability, ease of installation and productivity. CLI - Concrete Layer Innovations - maintains a strong commitment to sharing feedback on breakwater and coastal protection construction that is constantly fed by our many jobsites around the world.
MyVessel
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MyVessel is the logbook for merchant navy officers and cadets. Embarkations, sea time, STCW certificates, renewals: your whole career in one place. IMPORT FROM THE FRENCH SEAFARERS' PORTAL • Service record: your service lines become embarkations, grouped by ship, with tonnage and ship type filled in from the French-flag ship register. • Seafarer record: certificates, STCW endorsements and medical fitness, sorted by expiry. • Nothing is written without your approval, and every import can be undone. YOUR SEA TIME • Counted under the French rule of 10 August 2015: a month is 30 days. • Ongoing embarkation, overlaps flagged, leave lines left out. YOUR STCW CERTIFICATES • Progress towards your next certificate: officer of the watch, chief mate, master, chief engineer. Deck, engine or dual-purpose track. • Simulator: how many sea days until your next certificate? YOUR CERTIFICATES AND THEIR EXPIRY DATES • Reminders 90, 30 and 7 days before each expiry, in time to book the course. • The notification never names the certificate: nothing sensitive on the lock screen. YOUR CAREER ON A 3D GLOBE • Passages drawn along real shipping routes, with port calls and waypoints: Suez, Panama, Cape Horn… • Countries, ports, distance sailed, notable passages. DISCHARGE BOOK AS PDF • A clean record of your embarkations, ready to attach to an application. 100% PRIVATE No account, no server, no data collected. Everything stays on your iPhone, and backups go to the folder of your choice, including iCloud Drive. MyVessel is not an official maritime administration app. Calculations are for guidance only: the certificate-issuing authorities have the final word.
Screenshots
Verdict
The clearest difference is update cadence: MyVessel at monthly against Calculator's every 6 months. Calculator's advantage is iOS requirement (15.0 vs 26.1). 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. Neither carries in-app purchases, so what you see is what you pay.
Calculator ships an update every 6 months, MyVessel monthly. Both last shipped on October 25, 2026.
| Parameter | Calculator | MyVessel |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.1 |
| Further details — not scored | ||
| Size | 15 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | CLI - Concrete Layer Innovations | Lucas MARCHE |
In-app purchases
Calculator
No in-app purchases
MyVessel
No in-app purchases









