BHOS · Bathroom Health OS
BHOS Certification is not a data platform. It is a quality standard — owned by the founding anchor partner, operated by Chorus, and earned through an independent assessment process. A certified technology has been validated in a real living lab environment against defined, published criteria.
Access model
The BHOS platform distinguishes between open access — fast, low-friction, governed by TOTO directly — and certified access, which is required wherever trust, safety, health claims, or core data are involved. Certification is the gateway to the controlled layer, not a tax on building.
Open access
No certification requiredDeveloper registration with TOTO is sufficient. Open access is designed for speed — to let startups, researchers, and integrators begin building without a certification overhead.
Governed by TOTO directly.
Certified access
BHOS certification requiredAny capability that makes health claims, touches core platform data, or integrates at the physical hardware layer requires BHOS certification. This is where TOTO's brand and liability are on the line.
Governed by Chorus assessment + TOTO endorsement.
What it is
A certification standard is only as strong as the authority behind it, the independence of its assessment, and the market recognition of its mark. BHOS certification is built on all three.
Defined criteria
Six published domains assessed consistently across every technology in the programme. No proprietary scoring. No discretionary judgement without documentation.
Independent assessment
Chorus conducts the assessment. The endorsing anchor partner issues the certification. These roles are structurally separate — the assessor does not invest, and the endorser does not assess.
Endorsing authority
The mark carries the weight of the founding anchor partner — the category leader whose installed base, heritage, and brand give BHOS certification a meaning no new entrant could create.
Certification criteria
Every technology assessed under BHOS certification is evaluated across these six domains during its living lab period. The assessment is conducted by Chorus; findings are reported to the endorsing authority before any certification is issued.
Data sovereignty
The technology retains full ownership and control of its data pipeline. No third-party interpretation without explicit bilateral agreement. BHOS does not aggregate or route partner data.
Clinical validation
Accuracy and reliability demonstrated in a real-world setting with a defined population, methodology, and outcome criteria. Claims are evidence-backed, not asserted.
Regulatory posture
Compliance with applicable frameworks — HIPAA, GDPR, Japanese health data law — confirmed. A defined regulatory pathway documented and on track.
Privacy architecture
A documented consent model. User data handled to a published standard. Audit trail maintained and available to the certifying authority on request.
Integration compatibility
The technology can connect to the BHOS environment without data quality degradation. API or federation pathway scoped and technically verified.
Consumer experience standard
User interaction quality assessed against defined criteria for health-adjacent technology. Designed to protect both end users and the endorsing authority's brand.
On data sovereignty: BHOS certification does not require a technology to share, federate, or route its data to any third party. Each certified partner retains full ownership of their data pipeline. The assessment evaluates governance and architecture — it does not access or aggregate partner data.
Partner types
The six domains apply to every certified partner, but their weighting and assessment method vary by partner type. A hardware sensor faces different integration and clinical requirements than a care workflow app. Chorus tailors the assessment protocol accordingly.
Hardware module
Sensors, cartridges, analyzers, embedded modules
Software
Apps, AI interpretation, dashboards, care workflows
Clinical
Validation partners, evidence generation, claims support
Channel
Installation, servicing, enterprise deployment
Engagement tiers
All technologies that complete the living lab programme are assessed for standard certification. Companies that want to explore deeper partnership — including preferential commercial terms and investment consideration — can opt into a second tier.
Tier A
StandardThe public mark. Issued on successful completion of the six-domain assessment through the living lab programme. Carries the endorsement of the founding anchor partner. Renewable at defined intervals.
Tier B · Optional
Deep diligenceAn investment-grade assessment for companies seeking deeper engagement with the anchor partner ecosystem — preferential commercial terms, co-development, or investment consideration. Opt-in. Fully disclosed to all parties.
Process
The POC is the assessment. Companies already running in the BHOS living lab programme are already on the certification pathway. The four steps below convert that work into a permanent, market-facing credential.
POC intake
Technology enters the BHOS living lab programme. Chorus structures the pilot against the PEIRO evidence standard — Population, Environment, Intervention, Response, Outcomes.
Assessment
Chorus conducts an independent assessment across the six certification domains during the active POC period. All findings are documented in real time.
Evidence package
Chorus produces a certification recommendation report — the evidence base that the endorsing authority uses to make its decision. This is also the Tier B deep diligence output.
Certification issued
The endorsing anchor partner reviews the recommendation and issues BHOS certification. The mark is protected, dated, and versioned. Renewal is assessed at defined intervals.
Two perspectives
Founding anchor partner · TOTO
TOTO is not a customer of BHOS — they are its founding authority. One hundred years of quality manufacturing, 50M+ WASHLET units in homes globally, and the only brand in the world that can credibly constitute a bathroom health standard. TOTO's endorsement is what makes certification commercially meaningful to every startup that earns it.
What TOTO holds
The certification mark and the standard. No competitor can issue BHOS certification.
What TOTO gains
A screened, assessed pipeline of the best bathroom health technologies — with investment-grade intelligence on each.
What TOTO builds
A permanent category position as the quality authority in bathroom health — not just a company running pilots.
What TOTO protects
Brand, data sovereignty, and the ability to exit any relationship with documentation in place.
Technology company · Startup
BHOS certification is not a compliance exercise. It is a market credential that no competitor can acquire without going through the same rigorous living lab process — and it carries the endorsement of the category's anchor brand.
Your data stays yours
Certification does not require data sharing with any third party. Your pipeline, your IP, your model.
Your credibility grows
A BHOS-certified claim is independently verified — not self-asserted. It travels with you into every commercial conversation.
Your pathway is defined
The living lab POC you're already running is the assessment. Certification is the formal recognition of work you've already done.
Your options expand
Tier B opens the door to anchor partner commercial terms and investment consideration — on your terms, at your timing.
How Chorus fits
Chorus's role in BHOS certification is to define and maintain the assessment criteria, accredit the living labs that run assessments globally, conduct the independent evaluation, and produce the evidence package that the anchor partner uses to make its certification decision.
Chorus does not issue certifications. It does not hold equity in certified companies. It does not access or route partner data. Its value is the methodology — and the network of accredited living labs that apply it consistently across markets.
Chorus owns
The standard, the methodology, the accreditation network, and the assessment process.
TOTO licenses
The right to be the founding anchor endorser of the BHOS mark — for a defined term with agreed renewal conditions.
Oldowan invests
Separately, at arm's length, in companies that complete Tier B diligence. Disclosed to all parties at opt-in.
Right now
Technologies currently in live BHOS POCs are already on the certification pathway. The first cohort to earn BHOS certification will hold a credential their competitors cannot acquire retrospectively. Founding certified status is available only to companies active in the programme before the standard is formally published.
A globally accredited network
Chorus does not run living labs long-term. It creates the methodology and accredits universities, research centres, and care operators globally to conduct assessments on its behalf. This means BHOS certification is available across markets — not dependent on any single site, geography, or operating partner. Accredited living labs maintain the standard; Chorus maintains the network.