OS on
Tokyo 東京
Tokyo is twenty districts on one rail loop: pick one bed near your airport's hub, one district per half-day, never cross the city twice in a day.
- 2/5
- cash
- 4/5
- heat
- 4/5
- stroller
- 55
- friction
Trip OS · Japan · Vietnam · free
Not where to go.
Whether the day still works.
Keeps a trip executable when time, energy, weather, bags and the ground change. Give it your landing time, your bags and the table you booked; it returns days that fit — or the one constraint to loosen.
Decisions on the board solver live
- 22:55HNHAN → Old Quarter (Phố cổ): Ride-hailing car to the door, bed ~00:00 (+1)on time
- 10:40HNLeave Temple of Literature by 10:40 to keep the 12:30 last seating.buffer 9′
- 22:16KYKIX → Kawaramachi / Sanjō: HARUKA to Kyoto Station, bed ~23:54tight 6′
- 11:20KYLeave Kiyomizu-dera by 11:20 to keep the 12:30 last seating.buffer 13′
- 22:15OSKIX → Namba / Shinsaibashi: Nankai train to Namba, bed ~23:18on time
- 12:00OSLeave Tsūtenkaku by 12:00 to keep the 12:30 last seating.buffer 36′
- 22:20TKHND → Shinjuku (south/west): Keikyu to Shinagawa, bed ~23:22on time
Every line above is computed from the published data — nothing typed by hand.
Lines in service
Japan overview →OS on
Kyoto 京都
Kyoto is a walking-cluster city, not temple bingo: one or two clusters a day, bags never on a city bus.
- 4/5
- cash
- 5/5
- heat
- 2/5
- stroller
- 72
- friction
OS on
Osaka 大阪
Osaka is a flat, late-night food city with the easiest airport in Kansai: sleep in Namba for a late KIX landing, in Umeda for rail day-trips.
- 3/5
- cash
- 5/5
- heat
- 4/5
- stroller
- 48
- friction
OS on
Hanoi Hà Nội
Hanoi is a morning-and-evening city: do the lake and Ba Đình before 10:30, hide from the heat at midday, eat on the street after 17:00 — and cross roads slowly.
- 4/5
- cash
- 5/5
- heat
- 1/5
- stroller
- 68
- friction
How it decides
- 1
Airport → bed first
Every city opens with a proven path from a late landing to a bed that is still open — and a ladder for when the last train is gone.
- 2
Unknown stays unknown
A closing time we have not verified is printed as unknown, and the planner adds buffer for it instead of guessing.
- 3
Three honest options
Low load (α), low time risk (β), low cost (γ) — picked from the feasible set, each with what it gives up.
The world, one decision at a time
Countries open only when a city passes its gatesTokyo or Osaka?
Eight operational rows, one answer, before you buy flights.
→Does a JR Pass pay?
Tick your legs; the calculator says buy, skip or neutral.
→Big suitcases on the Shinkansen
What to reserve at 160 cm, and when to forward instead.
→