Tempest.energy

In development · Founding group opening spring 2027

AI that watches, people who care.

We're building a coach that turns your smartwatch data into plain-English insight, small experiments and real support, so you can get more energy, sleep better and get fitter.

Register interest in the founding groupSee how it works

Same night, two readings

Your watch measures. Tempest understands.

Your watch says

TODAYSleep61HRV38 msUnbalancedResting HR53

Three numbers and a status. And then?

Tempest says

Tempest AI

Your HRV has been below your normal most of this week, the same stretch you marked as busy at work. You also tend to sleep about 40 minutes less after evening sessions, and three of this week's finished late.

Want to try finishing before 7pm for a week? I'll compare your sleep.

  • Your normal 41–49 ms
  • You told me busy at work
  • Your history 6 of 8 evening sessions
  • Compared with you Not an average person: your own normal.
  • Connected to your life What you've told it, and what's going on.
  • Something to try One small change, then it checks whether it worked.
Illustration of how Tempest will work. Sam is an example.

Follow Sam, an example member, through their first 12 weeks

How Tempest will work

  1. Connect your watch. Garmin first; Apple Watch and others to follow.
  2. Learn your normal. Tempest builds a baseline from your own data, not population averages.
  3. Spot patterns. See what actually affects your sleep, recovery and energy, with the evidence.
  4. Try small experiments. Simple, safe changes, followed up so you know whether they worked.
  5. Real people behind it. On coached plans, a human coach reviews what the AI writes before it reaches you.

What we're planning

Base

An AI coach, weekly summaries, patterns in your own data and a content library.

Coached

Everything in Base, plus a human coach who reviews your updates, and group calls.

Further ahead

Blood tests and clinician support, planned for the future.

Prices are still being set. Nothing is for sale yet.

Where we are

Updated November 2026.

Working in testing

  • Daily watch data, from Apple Health exports and test data
  • Trends against your own usual range, with gaps shown honestly
  • Weekly summaries and check-ins written by AI from rules' findings
  • Patterns with their evidence, and small experiments with an automatic follow-up
  • A coach review queue: a person reads, edits or holds every AI-drafted message
  • A page showing everything Tempest remembers about you, which you can edit or delete

Next

  • A guided first conversation about your goals and your week
  • A look back after your first 12 weeks
  • Connecting Garmin watches directly
  • Opening to a small founding group on the Coached plan
  • Apple Watch and other devices

Further off

  • Blood tests and support from a clinician

More on our progress

Join the founding group

We'll open Tempest to a small founding group first, opening spring 2027. Registering interest isn't a commitment on either side.

Register interest

What Tempest is and isn't

Tempest is a wellness and coaching service. It describes your own data and helps you build better habits. It doesn't diagnose conditions or give medical advice.

If you're worried about your health, speak to your GP or call NHS 111. In an emergency, call 999.

For adults aged 18 and over.