We’re turning the bathroom into a privacy-first health operating system.
Not a device. Not an app. A five-layer system for passive sensing, intelligence, user-owned data, and ecosystem-scale health innovation.
Five layers,
one system.
Hardware
Bathroom-integrated sensing — toilet, mirror, scale, fixtures. Built into the room people already use.
Sensing
Passive, daily biomarker capture. No wearing, no logging, no remembering — signal in the flow of life.
Intelligence
Models that turn passive captures into meaningful health insight — longitudinal, contextual, on-device when possible.
Data & Privacy
User-owned, local-first, federated by design. The architecture is the trust signal.
Ecosystem
Founders, clinicians, corporates, institutions — coordinated around shared standards, not a single vendor stack.
Not a device. Not an app. A five-layer system.
Prevention has always required what people reliably won’t do.
The bathroom is the one room most households visit more reliably than any clinic, any app, or any wearable — used daily, passively, without ceremony.
- PassiveNo wearing, logging, or remembering. The room does the work.
- DailyA longitudinal health signal in the flow of ordinary life — not an episodic clinic visit.
- Zero frictionNo new habit required. Adoption doesn’t depend on behavior change.
Three forces are converging.
Sensors are ready
Toilet-, mirror-, and fixture-grade biomarker capture is becoming real — and the cost curve is finally bending.
AI is ready
Longitudinal pattern detection now works across low-signal data. The hard part is no longer the model.
Trust models must change
Surveillance-era architectures will not earn participation in the most intimate room of the house.
Where it lands first.
The home as healthspan infrastructure
- Falls risk & gait change
- Hydration & nocturnal patterns
- Frailty trajectory over time
Continuity, not episodes
- Cycle insight & fertility windows
- High-risk pregnancy continuity
- Perimenopause & long-arc trends
Daily signal where it matters
- Cardiometabolic & kidney
- Hydration & medication adherence
- Early decompensation flags
Not surveillance.
User-owned intelligence.
Local-first / on-device
Sensitive computation happens in the room. Raw signal does not leave the home by default.
User-owned vault
People hold the keys to their own data. Sharing is opt-in, granular, and revocable.
Federated intelligence
Models learn across populations without pooling personal data. Insight scales; exposure does not.
The architecture is the trust signal.
The BHOS Principles.
Eight commitments that define what it means to belong to this ecosystem. Public, evaluable, and signed. If you cannot sign in public, you cannot sign at all.
Data sovereignty
People own their health data — the keys, the copies, the right to leave.
Architectural privacy
Designed in, not promised. The system enforces the guarantee.
Edge-first inference
Computation as close to the person as possible. Cloud only when it serves the user.
Health in the home
The center of gravity moves to where people live. Institutions amplify, not gatekeep.
Open ecosystem
Interoperability, open APIs, no vendor lock-in. Standards belong to the field.
Prevention & equity
Designed for the median household, not the wealthiest decile.
Profit & purpose
The same engine. Capital — including the BHOS Fund — is how prevention finally scales.
Mutual accountability
Members hold each other to it. Silence in the face of breach is not an option.
How BHOS operates.
Identify high-leverage points
Systems mapping across hardware, data, regulation, and capital — to find where small moves produce large effects.
Incubate & pilot
Incubate hardware and run neighborhood-scale pilots — turning the model into something you can stand inside.
Orchestrate alliances
Convene founders, corporates, clinicians, and capital — and structure blended financing for the long arc.
Hold the field’s mirror
Function as a transition observatory — tracking what’s emerging, naming what’s missing, and publishing what we learn.
Why we start in Japan.
A rare alignment of substrate, culture, and demand — the conditions to build the standard before the rest of the world needs it.
- InfrastructureUnparalleled toilet-tech substrate. Decades of fixture, sensor, and bathroom integration that no other market matches.
- CultureHigh comfort with bathroom ritual and with technology in intimate spaces. The premise is not strange.
- Market readinessDemographics, regulation, and corporate appetite align. An aging population, an active state, and partners ready to ship.
Dispatches from the field.
The BHOS Litepaper
The first full articulation of the BHOS systems architecture — data sovereignty, shared language, trust infrastructure.
Systems ViewWhy the window is narrow
Health data categories don’t stay open for long. What happens if shared language isn’t built before capital consolidates.
From the FieldWhat the pilot taught us
Notes from a neighbourhood-scale pilot testing interoperability between bathroom sensors and clinical health records.
Who BHOS is for.
Founders & builders
Build on the platform. Sensors, models, applications, integrations — across all five layers.
02Researchers & clinicians
Validate the science. Cohort design, biomarker validation, clinical evidence, publication.
03Corporate partners
Pilot in market. Bring the room, the channel, or the deployment footprint to a real-world trial.
04Aligned investors
Back the long view. Patient capital for category infrastructure, not single-product bets.
05Institutions & policy
Frame the standard. Help shape the data, trust, and interoperability rules this category will run on.
Read the paper.
Pilot with us. Co-author the standard.
The category is forming now. The choices made in the next 24 months will determine who participates — and on what terms.