Mobile app Cadence, for the clients of a personal coach (prototype, fictional data)
The app that keeps your clients between two sessions.
The week’s plan, the guided session with its timer, booking a video-call slot, progress and the coach’s messages. A web prototype that really works, inside an iPhone 18 Pro Max and an iPhone Duo drawn in CSS.
Custom app, price agreed before we start
A plan sent by message is lost within a week. In an app, it gets followed.
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1:00rest
The rest between two sets
Barbell squat · 3 sets of 8 · 85 kg
- Set 18 × 85 kg
- Set 28 × 85 kg
- Set 38 × 85 kg
The rest, shown large.
In the app, the ring empties during the rest and the next set follows by itself. The timer opposite is the prototype’s own: sixty seconds, fifteen more if needed, or skip.
Start the rest, add 15 s, skip.
01
Five features, one phone that changes screen.
As you scroll, the iPhone 18 Pro Max turns and moves from the week to the guided session, then to booking, progress and messages. Each step invites you to touch the screen: the app answers, it is not an image.
02
On iPhone Duo, two panes.
Unfolded, the 7.6-inch display shows the list on the left and the detail on the right: the calendar and its slots, the threads and the conversation. An appointment booked on the Duo shows up at once in the iPhone 18 Pro Max on the page: one state, shared between every device.
03
Devices drawn in CSS.
No photo and no rendering: the iPhone 18 Pro Max (aluminium, Burgundy finish) and the iPhone Duo (polished titanium, Night Sky colour) are drawn from the dimensions Apple published in September 2026, and the app really runs inside them.
What you receive
Complete journey and sample data, to test on your phone before the final version is written.
Tabs, simple gestures, confirmation sheets, dark mode.
Slots, plans, reminders: what you already do, turned into screens.
Phone, foldable or tablet: the same data everywhere.
Name, colours, typefaces and tone chosen with you.
Files, accounts and domain name in your name, no subscription imposed.
One person to talk to, four steps.
You describe your activity
What you do and what the app should bring your clients. Fast reply.
You receive a precise quote
Scope, price, schedule and limits, before anything starts.
You follow the work
On an online preview and in your client area, approving each step.
Everything is delivered, in your name
With the files and a short walkthrough.
The same app, for your clients.
I design your custom app, fully remotely: first a web prototype true to real use, which your clients test on their phone, then the final version if you decide to go on.
On quoteprice agreed before we start, VAT not applicable
Try the app ↗contact@tramevia.com
You follow the progress live in your client area on otelow.com.
Cadence, Léa Marchand and Camille are a fictional brand and fictional characters created for this case study. The application is a web demonstration prototype, not an app published on an app store; the coach’s replies are scripted. The names iPhone 18 Pro Max and iPhone Duo are quoted for description only; the devices are drawn in CSS from the dimensions published by Apple and no logo is reproduced. No data entered is sent or stored.