Guidable, AI-generated audio tours built to scale
About the project
Guidable builds a personalized audio tour from a visitor's interests and location: retrieval-augmented generation in Python over a vector database of city content.
We built the generation, the discovery layer and the playback engine, for hundreds of thousands of users across Germany.
Ionic and Capacitor ship iOS and Android from a single React codebase over a GraphQL backend, so every feature lands once.
Services
Tech stack
Retrieval-augmented generation in Python over a vector database composes the tours; Ionic and Capacitor wrap one React codebase for both stores; NestJS, PostgreSQL and GraphQL hold the backend.
The hard part was making audio work in a real city
An audio-tour app looks simple until it meets a real city, a real network and real users on the move.
Problem
Discovery happens before playback
Solution
A visitor in a new city needs the right tour before they start walking. We built the discovery layer to surface tours by proximity and theme, so the right walk is one tap away.
Problem
Audio that never pauses mid-tour
Solution
The silent killer was buffering on slower mobile connections. We structured content delivery so the next segment loads in the background while the current one plays, and the listener hears one continuous tour.
Problem
State that survives the real world
Solution
Variable connections, a phone call, a locked screen, the app backgrounded. The playback layer handles background-mode interruptions and recovers mid-tour state, so a walk picks up exactly where it left off.
Problem
Tours that read as tours, not as playlists
Solution
From a visitor's interests and location the system composes a coherent, personalized audio tour: retrieval-augmented generation in Python over a vector database of city content.
Build a tour around any areaPick a neighborhood or a landmark and Guidable composes a tour around it, in the visitor's own language. 
Audio that plays as you walkPlayback tracks location in real time, so the narration keeps pace with wherever the visitor actually is.
Where it landed
Hundreds of thousands of users across Germany, with AI-built tours that are personalized, location-aware and available offline.
The app is backed by Deutsche Telekom, distribution that only works if playback holds up on a real network, in a real city.
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Questions about this build
Who built Guidable?
2muchcoffee built Guidable, an AI-generated audio-tour app serving hundreds of thousands of users across Germany, backed by Deutsche Telekom.
What does Guidable's AI tour generation involve?
Retrieval-augmented generation in Python over a vector database of city content: the system composes a personalized, coherent audio tour from a visitor's interests and location. Built on Ionic and Capacitor for iOS and Android, with NestJS, PostgreSQL, and GraphQL underneath.
