Regular sleep predicts risk
In UK Biobank, sleep regularity predicted mortality risk more strongly than sleep duration.
Windred DP et al. Sleep, 2024
Hello from poster F170. Thank you for scanning it. Here is how the method works, and how to reach us.
Your step counter resets at midnight. Your body doesn't.
Actogram is a circadian science technology company. We turn ordinary step counts into measures of the body's daily rhythm and bridge research and industry: tools and partnership for researchers, and an SDK that brings the rhythm into wellness apps and devices.
Meet us at Sleep Europe 2026, Maastricht: poster F170, Friday 23 October, 12:30–13:30
Why rhythm
Your body keeps its own day
Smartphones track the day from midnight to midnight. The body doesn't: its day moves with work, travel and late nights, and research shows that how regular it stays matters for health.
Experts agree it matters
A National Sleep Foundation panel concluded that regular sleep–wake timing is important for health.
Sletten TL et al. Sleep Health, 2023
Every body runs on its own time
Body clocks differ widely between people, and work schedules often pull sleep away from them.
Roenneberg T et al. J Biol Rhythms, 2003
Actogram superpower
Know when a person's day really begins
Extend your circadian-data pipeline beyond clock-based annotation. Turn continuous or retrospective human activity data into biologically meaningful days, nights and rhythm patterns, without assuming a conventional 24-hour schedule.
Time zones & travel
Requires no clock-time anchors. Naturally follows the rhythm across jet lag, time-zone shifts and daylight saving time changes.
Irregular rhythms
Identifies subjective days and nights even under shift work, irregular schedules and disrupted sleep–wake cycles.
Population scale
Tested against ground truth and health-related labels in large population cohorts.
Longitudinal depth
Works from step counts alone, enabling broad cross-platform and legacy-data compatibility and extending circadian analysis further back into individual and cohort history.
How it works
Only step counts. No lab, no extra sensors.
Rhythmoscope reads each person's rhythm from minute-by-minute steps from a smartphone or watch. The same algorithm, the Actogram core, is small enough for ultra-low-power chips.
- Step 1
Steps in
Steps from a smartphone or watch, minute by minute. No heart rate, no sleep stages.
- Step 2
A sanity check
No steps looks like rest, asleep or watch off. Over 12 hours of “rest” flags the day as unreliable.
- Step 3
The shape of each day
Days and nights are found from the steps, not cut at 00:00: when each day starts, peaks and winds down.
- Step 4
Two kinds of stability
Within a day: does activity hold up until evening? Day to day: are wake-up and bedtimes steady?
What it measures
- Each person's own days and nights, found from the steps
- When each day starts, peaks and winds down
- Within-day and day-to-day stability of the rhythm
- The body's midnight: a personal reference point in the night, averaged over recent days
Where we are
Ongoing research. Stability can be estimated from ordinary step counts. Formal validation is next: we are looking for sleep labs to test it against DLMO (the lab's melatonin marker of the body clock) and actigraphy.
Limits. Rest is inferred from steps, not measured sleep. A watch left on the table looks like rest.
Today: research use only, not a medical device.
For research groups
An industrial partner for your research
Invite us into your grant application as the industrial partner, and your results get a road beyond the paper: large cohorts, a smartphone app and SDK, and low-power silicon.
Your application on its ownWith Actogram as industrial partner
Consortium
Academic partners
Academic partners, plus an industrial partner
Route to impact
A plan for later use
A technology track already under way: app, SDK and silicon
After the paper
Results end in the paper
Results can move on: large cohorts, an app, a chip
Industrial partner in your grant
- Letter of support for your application
- Industrial partner in your consortium, with a plan for using the results
- Horizon Europe, MSCA, Eurostars and national calls
Scale and silicon
- Your method on large cohorts and smartphone data
- Built into an app and SDK for device makers
- A route into ultra-low-power watch chips
Data, tools and funding
- Minute-level analysis of wearable and smartphone activity
- Reference data from about 30,000 people (NHANES)
Funding for selected studies
Pilot study or analysis of existing dataup to USD 50,000
Collaborative or clinical study, full termup to USD 1 million
Sleep labs: help us test it against DLMO and actigraphy. A validation pilot can be funded up to USD 50,000.
Contact usHow your application gets stronger
- Your ideayour question, your data and the call you aim for
- Joint applicationwe join as the industrial partner, with a letter of support
- Your studyour tools and data; funding for selected studies
- Publicationyour results, with a route to use named in the discussion
- Towards industrylarge cohorts, an app and SDK, low-power silicon
Products
Three tools, one core
One way of reading the rhythm, in three tools. Try the research assistant in your browser today, and see the SDK at work in our iPhone demo.
Open to try
Circadian AI research assistant
Ask research questions in plain language about NHANES, a US health survey with activity data from about 30,000 people.
- Try 5 questions without an account
- Free account with a work email
- Pro, with our circadian measures: for approved research
Research preview
Rhythmoscope
Months of rest and activity, day by day: each person's rhythm and its stability at a glance, and a report in one click.
- Access by registration, with an agreement on confidentiality, joint publication and citation
- Next: run it on your own data
Demo in testing
Actogram SDK for apps and devices
Rhythm features for wellness apps and connected devices, such as a smart mattress: indicators, timely nudges and progress.
- Built on the same measures as Rhythmoscope
- Works from the steps your product already has
Actogram SDK
Bring your product to life
For wellness apps and connected devices. The SDK turns the steps your product already collects into features that follow each person's day and bring people back.
Steps in
Live stepsfrom a phone, watch or band
Past daysfrom Apple Health, with the user's permission
Actogram SDK, inside your app
- Rhythm indicators
- Timely nudges
- Progress
Tuned to each person's own day
In your product
New daily featuresguidance that follows each person's day
A reason to come backprogress people want to keep
And, if you wish, research for your brand. With your users' consent, we compare their rhythm before and after they start using your product, and you get a research report under your brand.
The SDK is in development, and our iPhone app shows it at work. The app is a demo, not a commercial product.
Talk to us about the SDKTry it yourself
Research assistant, in your browser
Ask NHANES in plain language
Biobank MCP, our research app on Hugging Face. Answers use the survey's weights, and each number comes with the call that repeats it.
Benchmarked against NCHS: tests reproduce 56 published estimates. See the checks
Open on Hugging FaceSDK demo, for iPhone
See the day's rhythm on iPhone
Biomatic, our demo app, reads steps from Apple Health and shows the day's rhythm hour by hour. A demo of the SDK, not a commercial product.
iPhone only, iOS 17 or later. Free, through Apple's TestFlight.
Join the waitlistGet the iPhone beta in three steps
The public beta opens soon. Join the waitlist now, and we will e-mail you the invite as soon as it opens.
- 1. Join the waitlistLeave your e-mail. A short confirmation comes right away.
- 2. Open our inviteWhen the beta opens, tap the invite on your iPhone, then Accept and Install.
- 3. Open BiomaticSign in with Apple and allow steps from Apple Health.
Join the waitlist
It installs through TestFlight, Apple's free app for trying apps before they reach the App Store.
Pipeline
Two tracks: science and technology
Two programmes grow from one core. Each climbs the technology readiness scale, from a lab idea (TRL 1) to a product in everyday use (TRL 9), in four stages.
Stage 1ResearchTRL 1–3
Stage 2PrototypeTRL 4–5
Stage 3ValidationTRL 6–7
Stage 4Scale-upTRL 8–9
Actogram coreone shared algorithm, two tracks
Science trackSleep–wake stability
Population researchactivity of about 30,000 people (NHANES)Stage 1: Research, TRL 1–3
We are hereiPhone app in testingApple Health steps, hourly activity goals; more testers nextStage 2: Prototype, TRL 4–5
Human studybehavioural intervention, target 10,000 peopleStage 3: Validation, TRL 6–7
Telemedicine and appsif validated, built into partner platformsStage 4: Scale-up, TRL 8–9
Technology trackUltra-low-power chip
Reference algorithmthe master copy, on a computerStage 1: Research, TRL 1–3
We are hereWatch prototyperunning on a test watchStage 2: Prototype, TRL 4–5
Low-power prototypetwo years battery life (10 µA)Stage 2: Prototype, TRL 4–5
Chip designthe same results as the reference algorithmStage 3: Validation, TRL 6–7
Licensingfor watch and chip makersStage 4: Scale-up, TRL 8–9
As of September 2026
What each track delivers
Science trackDigital sleep–wake programme
- Product
- iPhone app, and a software kit that telemedicine and wellness platforms can build in
- For
- Adults who want a steadier daily rhythm, and the services that support them
- Endpoint
- Change in day-to-day stability of sleep–wake timing, measured from smartphone and watch activity
Technology trackCircadian core in a chip
- Product
- The circadian core as a chip design that chip makers can license, and as a low-power chip of its own
- For
- Makers of watches and wearables, and the chip companies that supply them
- Endpoint
- Two years or more on one coin-cell battery (the whole device using 10 µA or less), with the same results as the reference algorithm
Team
The people behind it
A small team of scientists and engineers, registered in London as Actogram Ltd.
Sergey Filonov
CEO
Serial entrepreneur: more than 25 years of founding and growing companies in telecommunications, consumer electronics and biotechnology, with several successful exits.
Tim Pyrkov, PhD
Chief Data Scientist
Researcher and software lead: more than twenty years in bioinformatics and health technology, more than 20 papers and 2 patents, including work on biological age and resilience from wearable data.
Earlier research by Tim Pyrkov and colleagues
- Deep longitudinal phenotyping of wearable sensor data reveals independent markers of longevity, stress, and resilience. Aging, 2021
- Longitudinal analysis of blood markers reveals progressive loss of resilience and predicts human lifespan limit. Nature Communications, 2021
At Sleep Europe 2026
- Late-breaking abstract LBA22 and poster F170, Maastricht, 20–23 October
Questions
Short answers
What does Actogram do?
We read the body's daily rhythm from ordinary step counts and carry it from research into products: tools and industrial partnership for researchers, and an SDK that brings the rhythm into wellness apps and devices.
Is this a medical device?
Not today. Our tools are for research and wellness use and do not diagnose, treat or prevent any condition. If validated, the science track aims at a regulated digital health product, and the technology track at the low-power chip for such devices.
What data does it need?
Only minute-level step counts from a smartphone or watch: no heart rate, no sleep stages. A watch left on the table looks like rest, so a simple check flags days with implausibly long rest.
Is it validated?
Not yet. Stability can be estimated from ordinary step counts; formal validation is the next step, and we are looking for sleep labs to test it against DLMO and actigraphy.
How can my research group work with you?
Invite us into your grant application as the industrial partner. We add a route from your results to products: large cohorts, an app and SDK, and low-power silicon. We also provide data and analysis tools, and fund selected studies: up to USD 50,000 for a pilot or analysis of existing data, and up to USD 1 million for a collaborative or clinical study.
Can we build it into our app or device?
Yes, that is what the Actogram SDK is for. It works from the steps your product already has, and our iPhone demo shows it at work. Write to us and we will plan it together.
What do DLMO, actigraphy and NHANES mean?
DLMO is the time melatonin starts to rise in dim light, the lab's standard marker of the body clock. Actigraphy is movement recording with a wrist device. NHANES is a large US national health survey; part of it recorded a week of activity for about 30,000 people.
Where is the company based?
Actogram Ltd is registered in London, United Kingdom.
Contact
Let's talk
- Researchers: let's run it on your cohort's step data.
- Sleep labs: help us test it against DLMO and actigraphy.
- App and device makers: bring the rhythm into your product with the Actogram SDK.
Now looking for: sleep labs for validation, and app and device makers to try the SDK.
Meet us at Sleep Europe 2026
Maastricht, 20–23 October. Poster F170: Friday 23 October, 12:30–13:30.
Actogram Ltd, 71–75 Shelton Street, Covent Garden, London WC2H 9JQ, United Kingdom