Vote on ideas, build the days, settle the money, keep a private travel history. No account, no server, works offline.
Tagalong is one app for the three jobs of a group trip: deciding what to do, splitting what it cost, and remembering where you went.
There is no account. Trips live on your device and the app works with no connection.
Live sync passes each change through free public relays, sealed with AES-GCM. The relays only ever see scrambled bytes, and the key travels only inside your invite link. If no relay is reachable, the invite link still merges copies by hand.
Every sum runs in integer minor units, so the parts of an even, by-share or itemised split always add up to the bill exactly, tax and tip included.
A finished trip becomes a passport entry: countries, cities, return visits, flights, road trips and days away, with a world map. Nothing to fill in twice.
Name it, add the stops and dates, add the people.
Everyone adds ideas and votes.
Add each expense as you go: who paid, who shares it, which currency.
Settle up with the listed transfers.
Each day is either loose (Morning, Afternoon, Evening) or on the clock. Clock days show the free gaps, and one tap fills a gap.
A shortlist where the most wanted idea floats to the top. One tap puts it on a day.
Keep places in collections such as food, sights or a friend's tips, filter them, and turn any place into an idea for the group.
Changes reach the group within seconds over free public relays, end-to-end encrypted. Someone who opens the link later gets the latest state.
Organizers edit the trip, people and roles, and can lock the plan. Everyone can still add ideas, vote and log expenses.
Take a photo of a receipt and it is read on the device into line items, prices and tax. Nothing is uploaded.
Even, by shares, or itemised with tax and tip spread in proportion. Any currency per expense, at the rate you actually paid.
Finished trips become a travel history with a world map you can drag, pinch and zoom.
From the README’s “Run it” section. Full options, requirements and troubleshooting are there too.
Open the README
$ python -m http.server 8080Straight from the README, so you know what you're getting before you try it.
55 files in the repo · last updated 13 Nov 2026.
Browse the codeLive sync, roles and plan lock, places, receipt scan, map gestures, free native builds
Group trip planner, bill splitter and private travel history (offline PWA)
Web, PWA, Android, iOS. You can try it in the browser with nothing to install.
The commands in the “Run it” box above come straight from the README. Paste them into a terminal; the README covers options and troubleshooting.
Trips are stored on your device. With live sync on, changes pass through free public relays encrypted with a key that only exists inside your invite link.
No. There is no sign-up. Trips are stored on your device.
Press Invite on any tab and send the link.
No, because store listings cost a fee.
Live sync uses free public relays with no uptime promise. Roles are enforced by the app, not by cryptography: anyone with the link holds the key.
Not yet: it's marked “live” and still changing. The README always has the current state.
Plan the trip together. Split it to the cent.