Built at sea

A quiet logbook for mariners.

Portside is a personal log of the vessels you've sailed on, the ports you've visited, and the rank you held at the time. It works fully offline — because at sea you can't count on a signal.

Get it on Play Store See features

Works offline No ads, no tracking Free

What's inside

Everything a working mariner needs. Nothing else.

Built as a personal log first — the features exist because I needed them at sea.

Vessel log

Every vessel grouped by sign-on session. Name, call sign, IMO, and rank held at the time — kept clean and separated.

Port history

Ports sorted by latest departure, with a clear SIGNED OFF marker on the port where each voyage ended.

Offline nautical maps

Download coastal regions you'll actually need. Charts render with no signal — coastline, ports, and seamarks only.

Optional cloud sync

Sign in and your log travels with you across devices. Don't want it? Use Portside fully offline forever — no account needed.

Export & import

Your data is yours. Export the whole log as JSON or CSV anytime. Import it back into a fresh install without losing a thing.

Light and dark

Follows your system appearance — cream by day, deep nautical blue by night. Everything re-themes quietly.

The story

Built at sea, on an Android phone.

I work at sea. Portside is the logbook I built for myself — every vessel I've sailed on, every port I've visited, the rank I held at the time. It runs fully offline, because at sea you can't count on a signal.

The whole app was written in Termux on the same phone I carry to work — no laptop, no Android Studio. AI was the coding partner: mainly DeepSeek, with ChatGPT filling the gaps. I designed it, chose every feature, tested each build on my own device, and directed the process step by step.

If you work on ships, it's for you.

Kotlin Termux MapLibre Supabase OpenStreetMap DeepSeek + ChatGPT