Sentra A streak you can’t keep on your own.

One shared spot a day, walked together. Set out together and it counts for you both. The streaks become mates.

Members are called Senturions A few neighbourhoods first. Then London.

Become a Senturion See it on the phone Try the beta on TestFlight

Not open yet.

Apple and the App Store are trademarks of Apple Inc., registered in the U.S. and other countries. Google Play and the Google Play logo are trademarks of Google LLC.

The walk is real — 1,024 m through Bloomsbury, drawn from real map data. You can follow the whole route further down the page. Map data © OpenStreetMap contributors.

01 Meet the Senturion

One Senturion, one evening route.

Out after dinner. Streets you haven’t walked yet. Today’s spot at the end. Scroll, and London appears only where a Senturion has walked.

Map of Bloomsbury, London: a 1,024 metre walking route to Russell Square, with today's spot at the end. — A real 1,024 m walk to Russell Square, on the map the app draws. The mint grid is ground counted as covered, cell by cell, the way the app counts it. The three alerts are real app categories wearing the app’s own icons; their wording is written for this page. The offer card is invented end to end — The Example Kitchen is not a real business, and no offer like it is live. With reduced motion on, the scene holds the finished frame instead of animating it.

Maps © Mapbox © OpenStreetMap

Become a Senturion One of these a day, from your own building.

Sentranow Tonight’s spot just dropped — Russell Square.

Sentra21 min ago Walk tonight and the streak hits 10. ♥

02 On your phone

London is covered in things to walk to.

These are screenshots, not drawings. The map is the real one, the marker in the middle is you, and the pins landing on it are the kind of thing any Senturion can put there.

Eighteen things you can put on the mappin drops drawn for this page

Danger
Feels unsafe
Unlit street
Police presence
Street performance
Hidden gem

Six of the eighteen. Most are a heads-up, a few are a reason to go — and whichever you tap is on the map for whoever walks past next.

Screenshots from the Sentra build, taken on a test walk around Oxford Circus — every number on them is that walk’s own state, not other people. What is added by us: the pins landing on the map — the icons are the app’s own, where they land is ours — the ring round the microphone, and the two notifications above.

Maps © Mapbox © OpenStreetMap

Screenshot of the Sentra app: a street map around Oxford Circus with a marker on your position, pins on nearby restaurants, shops and galleries, the Oxford Circus Underground roundel, a chip reading 21 degrees and partly cloudy, and a card at the bottom offering to save the selected spot or get directions.

Screenshot of the Sentra app: a walking concierge panel that says “Hi! I’m your walking concierge. Ask me where to go or how to walk there”, above tappable prompts reading Somewhere to study, Coffee nearby, Next bus, Pub crawl and Cheap eats open now, and an input row with a microphone button and a send button. — **Those five prompts are really in the app.** Tap one, type your own, or just say it.

The concierge

A concierge, built in.

This is the AI in the app. Ask it in words or say it out loud. It helps you get around London — somewhere to go, and the way to get there. It remembers things if you ask it to, and forgets them the moment you ask. And when a place takes bookings, it hands you the booking page.

The microphone is real.ring drawn for this page

Screenshot of the Sentra app: a sheet headed “What do you see?” over a grid of illustrated sticker icons covering both hazards and finds. — **You are what fills the map.** Pick a sticker, drop the pin, confirm where it goes. Six of the eighteen are named beside the map above.

And if you’d rather take the quieter way, ask. The app can route you along calmer, better-lit streets — usually a couple of minutes longer, and it says so before you choose — and the whole walk stays inside Sentra.

We don’t call routes “safe”, and we never will. No app can honestly promise that about a city street.

Become a Senturion It is a quiet app until there are people in it.

03 Why we built it

The bit nobody warns you about.

You can move to London and go a month talking to nobody but a self-checkout. It is more ordinary than it feels: in the government’s own survey, no age group in the country says it feels lonely more often than 16-to-24-year-olds.

It fades faster on foot. Walk the same streets with someone and the city starts answering back — a busker outside the station, a bakery you’d have gone straight past, a street you now know by name.

Loneliness felt often or always: 9% of 16-to-24s, against 7% of all adults. Community Life Survey 2024/25, Department for Culture, Media & Sport. Fieldwork October 2024 to March 2025.

Sentra is the excuse. The walk does the rest.

Become a Senturion

The Senturion mascot — a small pale-teal character with coral cheeks, mid-wave.

Become a Senturion.

Sentra isn’t open yet. When it opens, it starts with a handful of London neighbourhoods and spreads from there. Bring your building.

There’s no sign-up list yet — when it opens, it opens here. If you run a building, the fastest way in is to tell us about it.

Apple and the App Store are trademarks of Apple Inc., registered in the U.S. and other countries. Google Play and the Google Play logo are trademarks of Google LLC.

Try the beta on TestFlight Put your area on the map Read our privacy policy

One shared walk a day. That’s the whole trick.