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Fay vs Function Health: Which Is Better?

Head-to-head comparison of Fay and Function Health based on our independent scoring across trust, value, experience, product range, and reputation — plus real pricing for the treatments they both offer.

Our Verdict

Function Health scores higher overall in our independent evaluation (76.3/100 vs 61.9/100), leading on trust & safety, value, experience, product range, reputation.

Fay logo
62
Fay
Fair

Insurance-billed marketplace for virtual registered-dietitian care (weight management, diabetes, GLP-1 support, PCOS); it does not prescribe medication.

Visit Fay
Function Health logo
76

Direct-to-consumer lab testing membership offering 160+ biomarkers twice yearly through Quest Diagnostics, with clinician-reviewed results and action plans.

Visit Function Health

Score Breakdown

DimensionFayFunction Health
Overall Score61.9/10076.3/100 ✓
Trust & Safety30%66/10078/100 ✓
Value25%70/10080/100 ✓
Experience20%62/10082/100 ✓
Product Range15%40/10060/100 ✓
Reputation10%62/10075/100 ✓

At a Glance

Founded20222021
HeadquartersSchaumburg, ILAustin, TX
Publicly tradedNoNo
Treatment categories21
Treatments listed12
Starting price—$30.42/mo

Pricing Where They Compete

Prices shown are based on our most recent research and may not reflect current pricing. Telehealth providers update their pricing frequently. Always verify pricing directly with the provider before purchasing.

CategoryFayFunction Health
Primary Care—$30.42
Annual Lab Membership

Fay

+Registered dietitians only, in-network with 700+ plans; many members pay $0 per session
+Pre-booking price estimator based on the member's insurance benefits
+Large clinician bench (3,400+ RDs) covering 30+ specialties including diabetes, PCOS and GLP-1 nutrition support
−No prescribers: Fay cannot prescribe or supply GLP-1s or any other medication
−Insurance estimates are unreliable per reviewers, with '$0 copay' visits later billed at $230 up to $1,400
−Reports of unexpected recurring charges and charges continuing after cancellation
Read the full Fay review →

Function Health

+Trustpilot rating of 4.5/5 across 2,960 reviews, among the strongest in the diagnostics-membership category
+160+ biomarkers tested twice yearly at 2,000+ Quest locations nationwide, far exceeding a standard annual physical (roughly 20-30 markers)
+Flat, transparent annual pricing ($365/year) visible before any intake or consult
−Reaching live customer support can be slow, per patient reports
−Results depend on Quest blood-draw logistics; a subset of patients report an inconsistent draw experience
−Membership covers testing and clinician-reviewed insights but not ongoing prescribing or treatment for abnormal results
Read the full Function Health review →

Fay vs Function Health — FAQ

Is Fay better than Function Health?

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Function Health scores higher overall in our independent evaluation (76.3/100 vs 61.9/100), leading on trust & safety, value, experience, product range, reputation.

What do Fay and Function Health both offer?

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Both platforms treat Primary Care. Fay covers 2 treatment categories total and Function Health covers 1.

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