Trail Companion · On-device AI
A hill-walking companion that lives on your phone.
Ask about your walking, your gear or the weather on the tops, in your own words. The thinking happens on your handset rather than in a data centre — so your question never leaves the phone, and answers from your own records work with no bars at all.
- Your question
- Never sent
- Condition photos
- Never uploaded
- Trail and weather look-ups
- Optional
- One-off download
- 2.4 GB
You've walked 412 km this year across 38 walks — 98 fells in total.
Your statisticsAnswered on the phone · no signal needed
Works where you actually are
Anything about your own walking is answered on the handset, with no bars needed. Ask something that needs a look-up with no signal and it waits, then answers when you next have one.
Your history stays yours
A GPS history is your home address, your routine and your movements. Your question is worked out on this phone. Trail and weather look-ups use your connection; nothing else leaves.
No data centre does the thinking
Inference runs on a device you already own and already charge, rather than in a building drawing grid power and water.
How it works
A workflow built for UK hills.
01
Download it once
In the app, open Settings and tap Trail Companion. It is a one-off 2.4 GB download over Wi-Fi, and Trailwise asks first and checks you have the space. Nothing is bundled into the app, and you can remove it again whenever you like.
02
Pick what you're asking about
Tap the spark in the top bar. It opens on the subject of the screen you were on — your gear, your walks, the walk in progress — or asks which one you mean.
03
Ask in your own words
Type it or dictate it. It answers from the tools that subject allows and says so plainly when a question falls outside them — no invented figures, and every number worked out by the app rather than the model.
04
Check the working
Every answer shows what it drew on, and "How I got that" opens the whole run — each look-up, why it was reached for and what came back.
Built for hikers
Everything you need on and off the hill.
On the hill
Trail conditions from a photo
Photograph a flooded path or a fallen tree and the condition picker opens with the type already chosen. You confirm or change it; nothing is filed without you.
Your history
Answers about your own walking
How far you have come this year, which fells you have left, how fast you actually walk — answered from your own records, with the walks they were drawn from.
Afterwards
A drafted write-up
Finish a walk and the notes field can draft itself from that walk's own figures. It is a draft in an editor, always yours to change or clear.
Before you go
A pack list from your own gear
A checklist pre-ticked from the kit you already own, for the route and the forecast — and it says why each thing is on it. It suggests from your inventory and never from a shop.
Planning
What to walk on Saturday
Trails near a place you name, what the weather will do on the tops, what other walkers have reported underfoot, or a loop of the length you ask for. These need a connection, and the app says so before you ask.
Mid-walk
Questions about the walk you're on
When the rain arrives, what it is doing on the summit, what is underfoot around you. Nothing interrupts you and nothing is watching — it answers when you ask.
Working
How it got the answer
Open any answer's working and you see the run itself: what it looked up, why, and what came back. The app does every sum; the model only puts it into words.
Offline
Questions that outlast the signal
Ask something in a valley with no bars and it is kept, labelled, in the conversation it belongs to. When the phone next sees a connection the answer lands there.
Private
Photos stay on the phone
Photos you take to report a trail condition never leave your phone. The report goes; the photograph doesn't.
Yours
Nothing trains on you
Nothing you type, say or photograph is used to train anything. Not our model, not anyone else's.
Control
Look-ups are yours to switch off
Turn look-ups off and nothing leaves the handset at all — it simply asks about less, and says which subjects it can still answer. You can also stop conversations being kept between launches.
Battery
Honest about the cost
Running a model on your phone uses battery, so it runs in short bursts when you ask — never in the background, and never while you are recording a walk.
Open
Built on an open model
The Trail Companion runs Google's Gemma, used under its open licence — listed in the app's open-source licences alongside everything else Trailwise is built on.
Optional
Entirely opt-in
The Trail Companion is a download you choose. Skip it and Trailwise works exactly as it does today.
Start your fell archive
The hills are waiting. Start tracking today.
Free to start — no card required. Build the trail history that grows with every season.