A travel planner that has to show its working.

The model proposes, the engines decide

A language model is good at knowing that Kanazawa is worth three days and that you would rather not change hotels twice in a week. It is bad at arithmetic it cannot see — how far apart two towns are, how long the drive really takes, what a train actually costs.

So RTour splits the work. The model chooses the cities, the order and the words. Everything measurable — distances, drive and rail times, the cost of each leg, whether the nights add up — is calculated by planning engines and handed back. If a stop does not fit, you are told what it would cost the rest of the trip rather than quietly given a plan that cannot be flown.

Every leg, three ways

Each hop between stops is evaluated as a train or bus, as a drive, and — once it is long enough to be worth it — as a flight. You see the hours, the cost and a note on why one is recommended, and you are free to pick a different one. The engines give context and warnings; they do not overrule you.

Where the knowledge comes from

Most of what RTour knows about a place comes from sources that are free and open: OpenStreetMap for geocoding, Wikipedia and Wikimedia Commons for descriptions and photographs, Wikidata for working out whether somewhere is a real landmark or just a building near one. Commercial map data is used where it is genuinely better — routing and transit — and avoided where it is not.

That is a deliberate design constraint rather than a cost saving alone. It is what lets the app show you a city in depth without metering how much of it you are allowed to look at.

Nothing is invented

If a rating is shown, it was measured. If a photograph is shown, it is of the place named. Where we do not know something, the app shows nothing rather than a plausible-looking number — an empty field is honest, and a confident wrong one is not.

It is a draft until you say otherwise

A plan is a conversation. Say you would rather have two nights in Florence, drop the ferry, or fly home instead of driving, and the itinerary, the map and the budget move together. Nothing is booked, and nothing is shared until you create a share link.