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ONU vs. Function Health: Two Different Ways to Approach Biomarkers

The app between your annual lab panels

Function Health and ONU are solving an overlapping problem — helping people understand and act on biomarker data — from two structurally different angles. Function is fundamentally a lab-testing membership; ONU is fundamentally an aggregation and interpretation app. Understanding that distinction matters more than a feature-by-feature checklist.

Side-by-side comparison

	ONU Health	Function Health
Core model	App that interprets your existing wearable and lab data	Membership that includes the lab tests themselves
Price	Free core tier; ONU Pro $16.99/mo or $149.99/yr	Reported at approximately $365–499/yr (varies by promotion)
What's included in price	Data interpretation and daily tracking	160+ lab tests annually, plus interpretation
Wearable integration	Apple Health, Whoop, Garmin	Not a core feature
First-party hardware	ONU Bracelet	None
Continuous daily tracking	Yes — daily ONU Score	No — testing occurs periodically (roughly twice yearly)
Requires blood draw through provider	No — works with labs from any source	Yes — testing is core to the membership

Detailed comparison

Explore the differences

Function Health's membership price includes the lab tests themselves — access to a nationwide network of testing locations, 160+ biomarkers tested periodically, and interpretation of those results. ONU doesn't sell lab tests; it interprets results from whatever source you already use — a doctor's office, an employer benefit, an independent lab, or a service like Function itself — and combines that with your continuous wearable data.

In practice, this means the two aren't strictly interchangeable: if you don't currently have easy, affordable access to comprehensive lab testing, Function's bundled testing has real value. If you already get labs done through insurance or a doctor and want the results and your day-to-day wearable data interpreted together, ONU is built specifically for that combination.

Frequently asked questions

If cost is your main concern

For someone specifically evaluating cost, it's worth running the numbers on your actual situation: if you already get comparable lab work covered by insurance or at a lower out-of-pocket cost than Function's membership, ONU's lower price point for interpretation alone may represent better value. If comprehensive testing isn't otherwise accessible or affordable for you, Function's bundled annual cost may work out more favorably than paying for 160+ individual tests separately, even accounting for ONU's lower software price.

For clarity on ONU's own structure: the app itself is free and works with virtually any wearable you already own, the interpretation-and-improvement layer requires the ONU Pro subscription (started inside the app after download), and the ONU Bracelet is available afterward for an extra $99 for anyone who wants the full, dedicated experience.

See how ONU interprets a blood test, from any source or compare ONU to Superpower instead.

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