Topo Local Discovery Stream

Make your favorite places feel better

On iPhone and iPad.Distributed through Apple TestFlight.

New signals appear on the map every day, and they are not all on the map yet.

Topo is a Local Discovery Stream that helps you find and keep those moments.

From your smartphone, you can talk to the city at any time.

Join Topo v1.2

Topo v1.1 introduced Scouter and began AI-powered observation of cities. In v1.2, Topo evolves from something you use to “look at” a city into something everyone can record and talk with, creating a new relationship between people, cities, and AI.

■ New feature 1: Personal Notes

Add a Personal Note to a card created by someone else or by Scouter. Mark an event with “I want to go.” Add what you felt after visiting a place. Note what you want to buy next on a shopping card. You can easily build your own record without creating every card from scratch.

Keep a note private, or choose to publish it and share it as local information.

■ New feature 2: Music Notes

We integrated Shazam into Topo so you can record music you hear in a city at the place where you heard it. Share “this city’s playlist, picked up by your own antenna.”

As more people capture music through their own sensibilities, a music heatmap will emerge on the Topo map, bringing the “song of the city” into view.

■ New feature 3: Scouter’s Observation Questions

Answer Scouter’s quick questions about a city with a tap. Your responses add details that Scouter could not discover alone and help make its cards more reliable.

■ Headline feature: Request an Observation from Scouter

The more you use Personal Notes, Music Notes, and Observation Questions, the more Topo can give back when you think, “This is how I want to spend today in this city.”

When you ask Scouter to observe a city, it begins with what you want that day and the signals you have left so far. It looks beyond the cards already in Topo, following information about places in the city and the latest updates they publish to find new local topics that may match your interests.

What Scouter finds arrives in Topo as a new “city card” created for you. Respond to it, and your reaction becomes the starting point for the next observation.

A person responds to a city. Scouter uses that response to observe it. What Scouter finds returns to the person as a card.

Personal Notes, Music Notes, and Observation Questions are not separate features. Together, they turn what you notice and feel in a city into your next encounter with it.

Topo v1.2 connects this cycle through Observation Requests to Scouter.

Across Japan and around the world, will the songs of cities come into view and conversations with them begin? Help us test Topo in as many places as possible.

If you want the technical version

Software architecture is only interesting if it changes what people can do. That said, technology can also move the world forward. Here is a quick look at how Topo works, for beta users who want the details.

Topo creates a new information layer on top of real cities so that you can access it from iPhone. Local news is everywhere, but it is usually buried in websites or social posts with vague location and date data. There is almost nothing that answers a simple question like “What is happening around Naka-Meguro 2-chome right now?”

Town Watch, the base layer behind Topo, collects, analyzes, classifies, and stores local news every day to observe the vitality of each area. It was originally built with coding AI to power the Topo town forecasts that we send to eight cities every day, but during that process a second system for delivering local news emerged almost naturally in conversation with the AI. I found that deviation interesting, and that became Scouter.

Town Watch scores each news item by checking questions such as “when was it published?”, “is the place within the intended TownWatch area?”, and “is the source URL correct?” Scouter receives those scored signals and the city vitality from Town Watch, then reassembles them into cards and places them back into the region.

That is what happens in the information layer. Topo, the iPhone app, only shows the result to the user. In version 1.1, we decided to try making direct contact with Scouter.

When a user launches Topo, a small signal is emitted. Nobody is told that the signal was emitted, but Scouter can receive it. Publishing a card to a place emits a stronger signal. Scouter reacts to that signal and starts fetching information for the place from Town Watch. That is what Scouter calls “observation.”

If strong signals keep coming in, the system tries to generate news for that area as a priority district. It strengthens observation on important places and, if it goes well, generates cards. Since the system’s job is to deliver information to the right place, it also celebrates the users who emit those signals as “contributors to the city.”

We also added an interface that visualizes public cards and Scouter locations on the map as heat levels. What I want to know is not only whether the software behaves correctly, but also what happens in the real city when Town Watch, Scouter, and the human signal are connected into one stage.

Whether in Japan or overseas, will Scouter truly drive and redistribute information to the right places? As a beta tester, please send a signal from your city into this urban-observation experiment that began with a conversation with AI.

How to download early access

  1. Open Topo in Apple TestFlight
  2. Install Topo

Free to try, no personal information required, and removable at any time.

©2026 TOPOS TECH LLC
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