From tracking to forecasting
TechTwin starts with the wearable data you already have to model how changes to your training, nutrition and lifestyle are likely to affect you — before you make them.
Add blood tests or DNA over time to give your twin more context.
- Free during beta
- One wearable is enough to get started
- Connect in about two minutes
Running · 18 weeks
Sub-3:30 marathon build
See if your current fitness can break 3:30.
Your twin
Answers from your own data
I have a marathon in 18 weeks. Can I target 3:30 without running more than five days per week?
Based on your 42 km a week, a 24 km longest run and steady HRV around 62 ms, five runs a week is the right shape: four would cram more into each run, and a sixth adds little for its recovery cost. I'd build volume gradually with marathon-pace work, an easier week every fourth and a three-week taper. Here's what your twin expects by race week.
Predicted marathon
3:27
−9 min
VO₂max
53.3ml/kg/min
+1.9
HRV
64.6ms
+2.3
Resting HR
49.1bpm
−1.7
18-week marathon build
90 sessions · starts Monday
Good morning, Sam
Monday
Today's readiness
Train as plannedHRV is back above your baseline after Sunday's long run, so today's tempo session stays in.
Training state
This week
Today · Tempo run, planned
Example forecasts. Yours are built from your own data.
Ask your twin what a 500-calorie deficit, six drinks on Saturday or a Zone 2 block would do. Every answer comes back as the most likely outcome and the range around it, built from your data, not a population average.
Scenario · 12-week marathon build
Your HRV is projected to rise 3.2 ms over this block.
Most likely 65.5 ms by week 12 (range 63.4 to 67.7).
Resting HR
48.9 bpm
−1.9
VO₂max
54.7 ml/kg/min
+3.3
Sleep score
88.1 /100
+3.1
Forecasts with a likely range
Every scenario returns its most likely outcome and the range around it. Solid is measured; dashed is your twin's forecast.
Ask in plain language
Plans, what-ifs and today's call, answered from your own numbers.
What-ifs
Ask your twin about new routines, interventions or changes to your plans. See what’s likely to happen before you commit.
Plans
Build race, strength and aerobic plans around your goals, schedule and available equipment.
Nutrition
Build nutrition plans around your goals, diet and food preferences. Get meal recommendations and shopping lists in advance.
Biological age
See how your fitness, recovery, body composition and metabolic health combine into a single biological-age estimate.
Your wearable already holds months or years of data on how you sleep, recover and train. Start there, then add blood tests or DNA to give your twin even more context. TechTwin fuses them all into one model of you. Works with Apple Watch, Fitbit, Pixel Watch and Oura. Full Garmin and WHOOP integration coming soon.
Day one
Your twin starts from years of your own data, not from zero.
Your twin can use that history straight away, so its first answers already reflect how you train, recover and respond.
Setting up your twin
Reading…Apple Health
6 years · 1,904 nights of sleep · 1,046 workouts
Blood test PDFs
2 lab reports · 15 markers
23andMe raw file
28 variants · 14 traits · file not kept
Enough history to start forecasting today.
Genomic profile
14 traitsCaffeine Metabolism
Fast metaboliser · Share of population
Iron Handling
Typical iron handling · Share of population
DNA
Fourteen traits from 28 variants across 23 genes. A measured blood marker always overrules an estimate from your DNA.
Blood panel · uploaded PDF
3 of 15 markersFerritin
Optimal · range 30–300
Vitamin D
Caution · range 30–80
CRP
Optimal · range <1
Bloodwork
Upload a lab report from any lab. Every marker is converted to one set of units and tracked over time, and markers like ferritin and CRP feed into your forecast.
Apple Health
Apple Watch, Garmin, WHOOP and Oura, all through Apple Health on your iPhone, every year of history included.
Google Health
Fitbit and Pixel Watch, read directly — no phone app to install, nothing to keep open.
Lab reports
A blood test PDF from any lab. Fifteen markers are read, from ferritin and vitamin D to HbA1c and testosterone.
DNA files
A raw file from 23andMe or AncestryDNA. The file is read on your device and never stored.
Connect once. Ask anything after.
Get startedConnect what you already have
Connect your wearable to bring in your existing health and training history. Add blood tests or DNA if you have them.
Your twin learns your baseline
Your sleep, recovery, heart rate and training load are modelled together and compared with what is normal for you.
Test a change before you make it
Ask about a new routine, training block, diet change or intervention. Your twin models the most likely outcome and the range around it.
Questions
Still wondering? Get in touch.
Your data, your call
- Your raw DNA file is read on your device and never stored.
- Download a copy of everything, any time, from Settings.
- Delete your twin and all of its data whenever you like.
Which devices and services does TechTwin read from?
Apple Health on an iPhone, which brings in Apple Watch, Garmin, WHOOP and Oura, and Google Health for Fitbit and Pixel Watch. Oura can also connect directly. For DNA, a raw file from 23andMe or AncestryDNA; for bloodwork, your lab report as a PDF. Watches that only write to Android's Health Connect cannot be read yet.
What can I ask my twin?
Anything that moves your numbers: a training plan, a calorie deficit or a diet like keto, an earlier bedtime, a night out. It answers with the metrics that change and the range each one is likely to land in.
How accurate are the forecasts?
Every forecast is a most likely value with its likely range, never a single promise. The range is widest while your twin is new and narrows as it learns your baseline, and once a plan is running you can see what actually happened next to what was forecast.
Do I need bloodwork or DNA to start?
No. One wearable is enough for a working twin. A blood panel or a DNA file refines the parts of the model it informs, and a measured blood marker always overrules an estimate from your DNA.
Is this medical advice?
No. TechTwin is a wellness forecaster. Talk to your doctor before acting on anything related to a medical condition.
Who owns my data?
You do. You can download everything, or delete your twin and all of its data, at any time from Settings.
What does it cost?
Nothing while the beta runs. There is no card to enter and no payment to take.
Try it on your twin first
Free while the beta runs · No card, no payment