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Case study/ Web app

An intermittent-fasting app where your fast has a temperature.

Category
Web app
Year
2026
Our role
Product design, Web app, AI coach
Tags
Product design · Web app · AI coach
Live
itssal.com
The challenge

A fasting timer counts hours but says nothing about them. Knowing roughly what your body is doing is what makes hour fourteen bearable — and most apps put ads or an upgrade between you and that moment.

The solution

It’s Sal turns the fast into a temperature: a dial that warms through five metabolic phases, a salamander that sleeps, wakes, runs and glows with it, and a plan built from twelve questions — in the browser, with no ads and nothing sold.

What we built/ 6 features

  • The dial

    Hours since your last meal, drawn as a temperature that changes colour through five metabolic phases.

  • Sal the salamander

    Sleeps while you digest, wakes, runs once fat burning starts and glows at ketosis.

  • Water, fuel and progress

    A graduated cylinder for water, a macro rail for food, and a record that lights each day a fast met its goal.

  • A coach that reads your log

    Ask Sal about your fast and it answers from your own program and log. It won’t diagnose, and won’t invent a figure.

  • A plan from twelve questions

    An eating window, a gentle ramp, calories, macros and water, all shown before anything is saved.

  • Safety built in

    Answers like pregnancy, insulin use or a history of eating disorders get a referral to a doctor, not a plan.

In detail/ 7 images
The It’s Sal home page with the fasting dial reading two hours in
The dial warms as a fast moves from food to fat.
The water, fuel and progress instruments
Water, fuel and progress, all reading from the same log.
Sal the salamander in five states, from asleep to glowing cold
Sal sleeps, wakes, runs and glows with the fast.
A conversation with the coach about whether to keep fasting at hour fourteen
The coach answers from your own numbers.
A sample sixteen-eight program with eating window, calories and macros
Twelve answers in, a schedule out.
The five fasting phases on a 24-hour timeline
Five stages, with approximate hours.
It’s Sal on a phone
One tap away on your phone.
Conyro’s role

  • Product design

    The dial, Sal and the four instruments, designed as one system.

  • Web app

    The fasting log, the instruments and the program builder, for the browser and the phone.

  • AI coach

    Answers grounded in each person’s own program and log.

The outcome

It’s Sal is live at itssal.com, in the browser and on the phone, with no ads, nothing sold and no paywall in the middle of a fast.

Contact

Have an idea for a business, or want to improve the one you already run? Tell us about it — the first consultation is free.

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