MARITIME CALCULATORS · iPHONE + ANDROID · WORLDWIDE
Astramate: Maritime Calculators for Seafarers and Deck Officers
Astramate maritime calculator app is an offline-first calculation toolkit for seafarers, deck officers, maritime students and cadets worldwide. Explore supported voyage time and ETA, compass-error, stowage-factor, cargo weight, and basic draft/trim tools. Features and allowances vary between Free and Premium.
Checking a cargo parcel against available hold space?
Cargo weight, stowage factor and usable volume belong in the same calculation review. Astramate brings supported cargo tools and visible working into one iPhone and Android toolkit so you can inspect your own figures without hunting through scattered formulas. Always verify results with approved vessel information.
Available now on iPhone and Android. Explore optional one-time lifetime Premium when you need the expanded supported toolkit.
Astramate is available now on iPhone and Android. Optional one-time in-app Premium purchase. Use the official App Store and Google Play links on this page for verified downloads.
See the working
Work with supported voyage, compass, loading and draft/trim calculations, including displayed formulas, working steps and validation warnings.
Work offline
Use core tools without depending on a continuous internet connection.
Keep vessel context
Use vessel profiles for repeated calculations, with history and export features available in the toolkit.
Start free
Use core tools without paying upfront. Unlock the complete toolkit with an optional one-time Premium purchase in the app.
Frequently asked questions
Is Astramate free to install?
Yes. Astramate offers free core tools, with an optional one-time Premium purchase for expanded features and an ad-free experience.
Does it work offline?
Astramate provides offline-first access to its core tools. Some account, purchase or update functions may require a connection.
Can I use it for official shipboard decisions?
Always independently verify results against your vessel’s approved documentation and applicable professional procedures.
Astramate is a reference and calculation aid, not a replacement for approved stability information, official publications, onboard procedures or professional verification.
Want the latest release news? Visit AstraLabs PH app updates for confirmed store releases and new features.