Company profile · 3 min read
Lucis: preventive health tracking built around blood data
Lucis combines recurring blood tests, wearables, biomarkers, partner labs and educational health guidance for members in Europe and the UK.
Cofounder of Lazyweb (a16z Speedrun). Previously grew subscriptions and built native ads at Duolingo. Writes First1000 (90,000+ subscribers).
Published · Updated
Lucis is trying to turn routine blood work into a long-term health companion for Europe.
What it does
The current Lucis homepage describes a membership that combines blood testing, wearables, health scores, personalized actions and partner labs. It says members can track 110+ data points, receive a first report in about three weeks and use more than 450 partner labs in Europe. The workflow is clear: share goals and history, connect data, get tested, understand the result and discuss the next step.
The developer page is a useful product boundary. Lucis publishes a public biomarker catalog and machine-readable API material, but says it does not publish a member API or MCP server. The public catalog is not personal health data. That distinction matters for anyone evaluating Lucis as an agent-readable health product.
Why I’d look closer
Lucis is not selling a single blood test. It is selling continuity: repeat checks, a personal baseline, and guidance that can be discussed with a clinician. The company says its content is educational and does not replace medical advice. That is the right boundary for a consumer health product, even if the marketing language is ambitious.
The founders’ public context is compact but relevant. The YC profile describes Max Berthelot as CEO and Baptiste Debever as CTO, with Baptiste previously an engineer at Gorgias. The public site also says Lucis brings together medical expertise, data and technology. Those facts explain the product shape; they do not certify clinical outcomes.
What I’d ask
I would ask which partner labs serve your country, what happens when a result needs clinical follow-up, how wearable data is used, and which recommendations are rules versus medical review. The public page displays member and Trustpilot numbers, but I would treat those as company/site-presented signals until independently checked.
My editorial take
Shortlist Lucis if you want a recurring preventive-health workflow and are comfortable discussing results with qualified professionals. It is less suited to someone looking for a one-off diagnosis or a substitute for a doctor. The useful product decision is whether the ongoing context is worth more than a conventional test and a PDF report.
This is a descriptive health-product profile, not medical advice.
Quick facts
| Field | Sourced detail |
|---|---|
| Product | Blood testing, biomarkers, wearables and personalized health guidance |
| Buyer | People seeking preventive-health tracking in Europe/UK |
| Public data surface | Read-only public biomarker catalog; no member API stated |
| Pricing | Not published in the checked pages |
| Main question | Which lab, clinical follow-up and data-use boundaries apply to you? |
Sources checked
| Source | Checked |
|---|---|
| YC company profile | 2026-09-19 |
| Lucis homepage | 2026-09-19 |
| Lucis developer resources | 2026-09-19 |
| Lucis about page | 2026-09-19 |
Cohort context
Lucis is listed in Spring 2025. In our 2026-09-18 directory snapshot, 10 of 143 listed companies in that cohort have YC’s primary industry label Healthcare (7.0%). This is a current-directory comparison, not an original intake count or a performance ranking. Nine-cohort dataset.
Public website snapshot
Observed 2026-09-19T16:15:44.168Z in raw homepage HTML. This records visible metadata and advertised links, not agent execution or product quality.
| Signal | Homepage observation |
|---|---|
| Product description metadata | Observed |
| Canonical link | Observed |
| H1 or H2 heading | Observed |
| Typed structured data | Observed |
| Docs/developer link | Observed |
| Pricing link | Not observed in this response |
| llms.txt link | Observed |
| Markdown alternate | Not observed in this response |
Public observations · Collection method. Missing links here do not establish that a capability or file is absent elsewhere.
About the author
Cofounder of Lazyweb (a16z Speedrun). Previously grew subscriptions and built native ads at Duolingo. Writes First1000 (90,000+ subscribers).
I cofound Lazyweb and publish Mudpie. This is an owner-written publication, not an independent testing organization. Research notes distinguish observations, sourced reporting and editorial judgment.
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