Calibre vs Function Health
Calibre vs Function Health, compared side by side on 19 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: Calibre is on 44/100 and Function Health on 55/100.
Where each one leads
Calibre
Leads on none of the measures we hold for both companies.
Function Health
- our overall score: 55/100 against 44/100
- agent readiness: 45/100 against 22/100
- domain rating: 71/100 against 54/100
- funding raised: $298M against $3.3M
At a glance
| Measure | Calibre | Function Health |
|---|---|---|
| What it is | A proactive health partner for life that deeply understands your full picture, tells you what's actually driving your health, and guides you as your health evolves. | Membership-based service offering 160+ lab tests, doctor insights, and lifetime health tracking. |
| Category | HealthTech, Artificial Intelligence, Personalized Health, Wellness | HealthTech, Telemedicine, Longevity, Precision Medicine |
| Sells toBusiness model | B2C | B2C |
| Offering | Services | Services |
| Founded | 2025 | 2021 |
| Headquarters | London, United Kingdom | Miami, United States |
| Status | Active | Active |
Size, funding and growth
| Measure | Calibre | Function Health |
|---|---|---|
| Employees | Not published | 7 |
| Total funding | $3.3M | $298M |
| Latest round | Pre-seed | Series B |
| Valuation | Not published | $3K |
| LinkedIn followers | Not published | 152 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Calibre | Function Health |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 44/100 | 55/100 |
| Traction | 33/100 | 49/100 |
| Team | 70/100 | 70/100 |
| Search visibility | 16/100 | 41/100 |
| Quality | 48/100 | 58/100 |
| Agent readinessHow well an AI agent can read and act on the site | F (22/100) | D (45/100) |
| Domain ratingLink authority, 0-100 | 54/100 | 71/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Calibre | Function Health |
|---|---|---|
| Hosting | Not detected | Vercel |
| CDN | Cloudflare | Cloudflare |
| Frameworks | Next.js, Tailwind CSS | Svelte, Astro |
| Analytics | Google Tag Manager | Mixpanel |
Product and pricing
| Measure | Calibre | Function Health |
|---|---|---|
| Key features | Not published | Comprehensive Lab Tests, Doctor Insights & Clinician Summaries, Lifetime Results Tracking, Nationwide Testing Access, Early Disease Detection |
Calibre vs Function Health: common questions
Which is better, Calibre or Function Health?
On our 0-100 score Function Health rates higher (55/100 against 44/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 19 data points above: read the rows that match what you are buying for.
How do Calibre and Function Health compare on the numbers?
Function Health leads on our overall score (55/100 against 44/100), agent readiness (45/100 against 22/100), domain rating (71/100 against 54/100), funding raised ($298M against $3.3M).
Read the full Calibre review and pricing or the Function Health review and pricing. You can also browse other Calibre alternatives we track.