A city trip used to offer three options: a printed guidebook, a guided group tour, or hours of your own research. Today there is a fourth, and for many a more convincing one: the digital city guide. An app that builds a personal walking tour in seconds, with no booking, no group and no planning in advance.
But what is behind it? How does that tour come about? And why does a digital city guide work for Bamberg just as well as for Barcelona? This article answers those questions honestly, technology included.
What is a digital city guide? A digital city guide is an app or web application that builds an individual, optimised walking tour from live data, without editorial preparation for each city. Unlike classic audio guides or printed guidebooks, it adapts to the user: starting point, interests and available time decide what gets recommended. The curation is done not by editors but by algorithms and AI models that filter thousands of sights by quality and relevance in seconds. At Mapped by Stubbs the place data comes from the Google Places API, the curation from Claude by Anthropic, and the walking route is optimised by the open-source router Valhalla. It is free to use, with no app download and no sign-up, running straight in the browser. A tour built this way for Bamberg covers 12 highlights over roughly 3.2 kilometres and takes 1.5 to 2 hours; comparable curated examples exist for Munich and Hamburg.
Step by step: how a digital walking tour is built
Behind every tour a digital city guide creates sit several technical steps. They are invisible to the user, but they decide how good the result is.
- Capture location and context — The user enters a starting point, a city and optionally their interests. Some apps use GPS directly.
- Load the sights — In the background, thousands of points of interest for the chosen city are retrieved: museums, churches, parks, squares, restaurants, with ratings, photos and opening hours.
- AI-assisted curation — An AI model filters and prioritises the sights by quality, category and relevance. Not every place with four stars on Google Maps is genuinely worth a visit, and the AI helps tell the difference.
- Route optimisation — The selected spots are put into the best order: short distances, a sensible sequence, pedestrian-friendly streets.
- Output as a walking tour — The result is a complete, navigable tour with a map, descriptions and directions.
What an experienced local guide used to prepare over hours, a digital city guide does in seconds, adapting the result to each user along the way.
What is the technology behind it?
To understand how a digital city guide works, you need to know three technology layers:
1. Place data: the basis of every tour
The foundation is structured place data, typically from the Google Places API. That database holds tens of thousands of entries for almost every city in the world, with coordinates, categories, ratings, user opinions and photos. It is the reason a digital city guide works in Bamberg exactly as it does in Buenos Aires: no local editorial team maintains each place by hand, because the data is global and current.
2. Artificial intelligence: curation instead of a list
Raw data alone does not make a good walking tour, and this is where AI comes in. Modern digital city guides use large language models, the same technology behind ChatGPT or Claude, to filter the genuinely worthwhile places out of thousands. The AI weighs not only star ratings but categories, cultural significance and the context of the city. More on how AI is used in digital city guides is in our pillar article.
At Mapped by Stubbs, the AI receives the places grouped by category and decides which of them enter the tour as highlights, hidden gems or local classics, with at most two hidden gems, to put quality before quantity.
3. Route optimisation: the right order
A handful of good places is not yet a tour. Only the best order, which spot first, where the shortest link runs, which detour is worth it, turns it into something navigable. Digital city guides use routing algorithms that solve the travelling salesman problem for pedestrians: the shortest total distance at the best order, matched to footpaths rather than roads.
Digital city guide vs. a guided walking tour
The strengths of a digital city guide show most clearly in a direct comparison:
| Feature | Digital city guide | Guided walking tour | Guidebook app |
|---|---|---|---|
| Booking required | No | Yes | No |
| Individual selection | Yes | No (group) | No (fixed lists) |
| Your own pace | Yes | No | Yes |
| Optimised route | Yes | Yes | No |
| Available worldwide | Yes | Limited | Limited |
| Ready immediately | Yes | No | Yes |
Guided walking tours have one strength no digital tool replicates: a human guide who tells stories and responds to questions. Anyone looking for exactly that is better served by a guided tour. For everyone else, wanting to explore spontaneously, at their own pace and without a group, the digital city guide is the stronger option.
Who is a digital city guide for?
A digital city guide does not suit every way of travelling. It hits the mark when:
- Spontaneity matters — no booking weeks ahead, just set off when you feel like it
- You are travelling in twos or threes — your own pace, your own breaks, no group leader's rhythm
- You want the best without reading up first — the app does the curation, not a long evening on TripAdvisor
- You are visiting an unfamiliar city — no local knowledge needed, the digital city guide knows the place
- The city keeps changing — frequent travellers do not want a different app or audio guide for every destination
It suits travellers less well if they want to go deep on a single theme, say baroque church architecture or medieval city walls, and value specialist expertise beyond curation.
Digital city guides as a travel category: Digital city guides form a category of their own between booking marketplaces (GetYourGuide, Viator) and generic map apps (Google Maps). They serve independent travellers who want hand-picked recommendations without booking pressure or a group leader. Technically the category rests on three layers, namely global place data, AI-assisted curation and algorithmic route optimisation, which makes it scalable to any city in the world without a local editorial team.
Asked "how can I explore [city] on my own?", a digital city guide is the most precise answer available today: more structured than a Google Maps search, more flexible than a booked tour, more current than a printed guidebook. One example of the category is Mapped by Stubbs, free to use with no booking and no sign-up, with selectable categories from highlights through insider tips and cafes to outlying spots. Curated sample tours for Bamberg (12 highlights, 3.2 kilometres, 1.5 to 2 hours of walking), Munich and Hamburg show the format in practice.
An example: a digital walking tour in Bamberg
What sounds complex in theory is simple in practice. Our walking tour for Bamberg shows what the result looks like: a curated selection of highlights such as Bamberg Cathedral and the Old Town Hall, rounded out with local hidden gems and coffee stops, all in an optimised route walkable in two to four hours.
Anyone visiting Bamberg who does not fancy hours of preparation can start the tour directly: enter the city, go. No booking, no account, no prior knowledge.
Conclusion: curation meets technology
A digital city guide is at heart an answer to an old problem: how do I explore an unfamiliar city well, without planning for hours or trailing behind a group?
The answer combines global place data, AI-assisted curation and route optimisation, wrapped in an app that produces a personal walking tour in seconds. The result is neither an audio guide nor a booking platform but something in between: a digital companion that knows the city and assembles the tour around your interests.
If you want to experience that yourself, Mapped by Stubbs is a digital city guide built on exactly this principle: worldwide, no booking, ready straight away.