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Hungary, on foot

Walk Budapest and light up both banks

FOG hides the world map until you walk it. Budapest splits neatly into flat Pest and hilly Buda, and the fog comes off differently on each side.

Flat Pest, steep Buda

The Danube does most of the work of explaining Budapest. East of it, Pest is flat, laid out by nineteenth century planners, and walkable for hours without a single real climb. West of it, Buda is hills: Castle Hill above the river, Gellért Hill rising to 235 metres with the Citadella on top, and the residential slopes of Rózsadomb behind them, where streets turn into switchbacks and staircases.

That split changes how you plan a day. In Pest you cover ground quickly. In Buda you earn it. Several road bridges cross between the two banks in the central stretch, and every one of them is walkable, which matters more than it sounds when you are trying to close a loop rather than walk out and back.

Rings and spokes

Pest is built as a set of arcs cut by radials. The Kiskörút, the small ring, traces the line of the old city wall around District V. Outside it the Nagykörút, the grand boulevard, runs roughly four kilometres from Margaret Bridge to Petőfi Bridge under a handful of different street names. Andrássy út is the long diagonal, dead straight from Deák Ferenc tér to Heroes' Square and the City Park.

Walk one arc and one spoke and you have already drawn a recognisable piece of the city on your own map. The blocks between them are where the small streets are: District VII around Kazinczy utca, District VIII behind the National Museum, District IX down toward the market hall. Small streets are what actually move the city percentage.

A river afternoon

A clean six or seven kilometres. Begin at Liberty Bridge on the Pest side and walk north along the embankment past the Vigadó and the Parliament. Cross the Chain Bridge, then climb the switchback path or the stairs up to Castle Hill. Come down through the Víziváros streets to Batthyány tér, take Margaret Bridge, and finish with a lap of Margaret Island, which is car free and about two and a half kilometres around.

It crosses both banks, three bridges and an island. On a fog map that shape reads immediately as Budapest and not as anywhere else.

Heat, cold and the walking calendar

Budapest is properly continental. July and August regularly sit in the mid thirties with no sea breeze to help, and the stone embankments hold the heat well into the evening. January can stay below freezing for a week at a time and the Buda hills get slick. Spring and autumn are the long walking seasons and locals treat them that way.

Practical notes. Castle Hill and Gellért Hill are stair heavy, so plan the climbing early. The funicular is a nice ride but it is not walking. Metro line 1 under Andrássy is shallow and frequent, which makes it useful for getting back to your start without retracing streets you already cleared.

What FOG does here

The map starts black. Every street you walk clears permanently and never fogs back over. FOG asks for no account, keeps no cloud copy, runs no analytics and shows no ads, so the record of where you have been in Budapest stays on the handset in your pocket.

City percent tells you what share of Budapest you have lit up. Across two banks and twenty three districts that number stays humble for a long time, which is the point of it. Free to explore, and one purchase of USD 5.99 unlocks unlimited ranks, every character and history import.

Questions people actually ask

Does FOG work on both sides of the river?

Yes. It works anywhere on Earth, walking, running or riding. Pest and Buda are just streets to it, though Buda will cost you more effort per kilometre.

Can I import walks from before I had the app?

Yes, with the one-off unlock. History import handles Google Timeline exports and GPX files.

Is there a subscription?

No. FOG is free to explore and there is one purchase, USD 5.99, which unlocks unlimited ranks, every character and history import. No subscription, ever.

Does it keep working when my phone is in a pocket?

Yes. Background exploring keeps revealing streets with the app closed and the screen off.

Start with a dark map.

FOG is free to explore. No account, no subscription, and your map never leaves your phone.

free to explore · one purchase unlocks everything · never a subscription