12-week transformation · iPhone and Apple Watch

12 weeks.
Change you can measure.

A plan for training, sleep, habits and food. A measurement week to start, a Sunday photo check-in, data from your watch and a review every Monday. The plan is written by AI, by you, or by your coach.

For you

I want to do the 12 weeks

Join the first shared start. Everyone begins on the same Monday, alongside people with a similar goal.

Count me in
For coaches

I run challenges or coach clients

Replace the Facebook group and Google Forms. Plans, check-ins and client results in one place, backed by data.

Book a 20-min call

Transformations today live in a Facebook group.

A PDF plan

It doesn't adapt when a week goes sideways. Delta12 adjusts next week to what actually happened.

Photos in your camera roll

Different light and a different angle every time. Here you shoot with last week's outline, always the same.

Feelings, not data

“I think it's better.” Delta12 measures where you start and repeats the same tests after 6 and 12 weeks.

How it works

A measurement week, then 12 weeks of plan.

measurement weekperformance testslighter week
Week 0

Measure the start

Photos, measurements, aerobic and strength tests, mobility. 90 days of history from your watch.

Every day

Tick off the day

Workouts match from your watch on their own. You never enter anything twice.

Sunday morning

Check-in

Three photos with last week's outline and a short questionnaire.

Monday morning

Report

What moved, and suggested changes for next week. You approve them.

What's in the plan

More than training.

01

Training

Strength, endurance, mobility. Runs go to Stopa or your watch.

02

Sleep

A regular bedtime and an evening routine.

03

Habits

Screens, alcohol, caffeine. A quick tick-off each evening.

04

Food

Principles that fit your preferences. No calorie counting.

Data, not feelings

Aerobic test · pace at the same heart rate
5:485:21/km
Resting heart rate · weekly average
5248bpm
Push-ups · max
2435

Example values. Delta12 reads sleep, HRV, resting heart rate and workouts from Apple Health. Weight is one metric among many, never the main one.

Privacy

Nobody sees your photos. Not even us.

Progress photos and health data are the most sensitive things you have. We treat them that way.

01Photos encrypted on your phoneOnly you hold the key, in your iCloud Keychain. Photos can only be taken with the in-app camera.
02Raw Apple Health data stays on your phoneOnly daily and weekly summaries reach the server. The AI never sees photos or raw data.
03EU servers, you delete everythingFrankfurt, separate consent for each use, export and deletion with one button.

Who writes the plan

You choose the author. Everything else stays.

AIBuilds the plan from your goal, your time and 90 days of history. Changes nothing without your approval.
YouEdit the AI draft or write your own plan. Every change records who made it and why.
CoachA person guides you. They see your check-ins and data only if you let them.
✓measurement week✓photo check-in✓watch data✓weekly report✓before-and-after finale
For coaches

Client results, not Instagram.

Running challenges through a Facebook group, Google Forms and spreadsheets? We're building a tool to lead 10 or 100 people at once. We're looking for 20 coaches from Czechia and Slovakia to build it with.

Book a 20-min call
Plan templates

One program for the whole group, adjustments for individuals.

Check-in queue with AI summaries

Sixty Sunday check-ins in an hour, not a whole day.

Verified results

Client progress measured with the same tests. Your best reference.

The first shared start

Join the list.

We'll write once, when the start date is set. No newsletter.

When does it start?I'm testing the app on myself right now. The first group starts after my 12 weeks end, in 2027.
What do I need?An iPhone. An Apple Watch or another watch that writes to Apple Health helps, but isn't required.
Android?Not yet. Let us know if you'd want it.
What will it cost?The first group is free in exchange for feedback.

Main goal (optional)

We store your email in the EU (Frankfurt) and use it only for this. Ask by email and we'll delete it. Controller: Peter, founder of Delta12.