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    A pledge is a pre-order, paid now in your currency and refunded automatically if its city hasn’t won within 60 days. If the lead changes in the last 5 minutes before a departure, boarding stays open until 5 minutes after the change (15 minutes at most). Terms · Privacy

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    A twin that feels off, a bug, a city we’re missing, an idea: tell us.

    Or email hello@twinhoods.com

    How Twinhoods works

    Telling a friend from Istanbul about Amsterdam, you might say “the Jordaan is a bit like Cihangir”. Twinhoods does that for whole cities, all around the world.

    Every neighbourhood gets scores for 17 traits, from nightlife and food to green and historic, plus how central it is. It also gets a short description: what people go there for, who lives there, how it came to be and where it sits in its city. Each place in the city you’re exploring gets the name of its closest match in your city, and the whole map is fitted at once. Most names go to one place. A name goes to two places only when both fit it well, and a leftover place can share a similar neighbour’s name. When your city has more places, a well-known name can join a similar neighbour’s, as in “Levent & Maslak”. Parks, forests and mountains take names only from each other, one each.

    Colours say what a place is most about (the list has the key). The number is how alike the two are: 100 means identical, two places picked at random score about 50, and the map’s fit is the average. ??? means nothing in your city fits that place: the names ran out, the close ones went to places they fit better, or it’s a park and your city has no park like it.

    Shapes follow open boundary data where there is some, and elsewhere are drawn around each neighbourhood’s heart and cut by water: they show roughly where a place is, not where it legally ends. Profiles are impressions written with AI help and checked against OpenStreetMap: vibes, not facts, and not travel or safety advice. Something wrong or hurtful? hello@twinhoods.com

    Map © OpenFreeMap © OpenMapTiles data from OpenStreetMap. Neighbourhood boundaries and some coordinates © OpenStreetMap contributors, available under the ODbL. Some boundaries in New Zealand from LINZ (CC BY 4.0), in the UK from the ONS and the Scottish Government (OGL v3; contains OS data © Crown copyright and database right), and in Japan edited from e-Stat census areas. Cities to add from GeoNames (CC BY 4.0). London profiles checked with local facts from PostcodeHub, used with permission. Open-source licences.

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    San Juan, translated into Oslo

    Viejo San Juan is the Akershus, Miramar the Frogner, El Yunque the Nordmarka. See all 35 places.

    Oslo, translated into San Juan