Features¶

Periplus is a single-page progressive web app with no build step and no backend. Everything below runs from one HTML file.

Offline-first¶

Open it once with a connection and a service worker caches the whole itinerary. After that it loads instantly and works with no signal: airplane mode, mountain passes, the dead zones along your route.

Installable¶

On iOS (Safari → Share → Add to Home Screen) or Android, Periplus installs to your home screen with its own icon and launches full-screen, no browser chrome.

Light & dark¶

The app follows your phone's light or dark appearance automatically. A top-bar toggle cycles Auto (follow the system), Light, and Dark, and remembers your choice on the device. Printing stays light either way, so a paper copy is clean.

Tap-to-navigate¶

Every food spot, hike, beach, and your lodging has a Directions link that opens your maps app. A toggle lets you pick Google or Apple Maps, and your choice is remembered.

Add to calendar¶

Every event in the 8-week calendar is an Add to calendar link. The same Google/Apple toggle decides whether it opens a pre-filled Google Calendar event or downloads an Apple/ICS file generated on-device, so it works with zero signal too.

Searchable directories¶

Filter food by type (sandwiches, BBQ, breakfast, sweet) or the outdoors by category (parks, hikes, beaches, museums), or search by name. Filtering is instant and shows a live count of how many spots match. Each directory carries its own Google/Apple directions toggle.

A status chip counts down to your trip, then tracks which day you're on and what's coming next, reading from the itinerary's activity map.

Persistent checklists¶

Pre-trip prep and packing checklists remember what you've ticked off, saved locally on your device.

Edit in the browser¶

Tap Edit and the whole page becomes editable — no code, no redeploy. Change any text in place, and add, remove, or reorder entries: food and outdoor spots, intel, contacts, trip anchors, the plans inside each week, checklist items, timeline steps, and whole weeks or checklist groups. Changes save to your device and survive a reload; Reset restores the built-in itinerary.

Export and import¶

Export copies your whole trip as JSON to back up or share; Import pastes one back in. That exported JSON is also the TRIP block a fork uses, so you can plan a trip visually, export it, and drop it into your own fork to make it permanent. It all happens on-device, with no upload.