Function Health combines broad recurring testing with clinician-reviewed product insights, past-result uploads, trends, and downloads. Libby does not order tests; it organizes existing lab PDFs around source facts, a timeline, and PDF or CSV export.
Libby is a partial alternative for record organization, not a replacement for Function's testing or protocol workflow.
Both products describe historical-result intake and longitudinal views. The useful differences are testing, guided output, source detail, export contents, post-term access, and privacy scope.
Lists 160+ annual lab tests across two included rounds, plus clinician-reviewed product insights, a personalized protocol, past-result uploads, trend views, and result downloads. Add-ons and on-demand retesting can cost extra.
Organizes uploaded lab PDFs into structured rows and repeated-marker history with PDF or CSV export. Every extraction should be checked against the source report. Libby does not order tests or provide Function's guided protocol.
Read this as a dated workflow comparison, not a universal winner. Test the historical intake and exit artifact you expect to use, then confirm current checkout and policy terms.
| Function Health | Libby (report organizer) | |
|---|---|---|
| What it is | A testing-and-insights membership | Lab-report organization software |
| Core job | Arrange broad recurring tests, review results, and build a protocol | Organize existing lab PDFs around source facts and a timeline |
| Testing | 160+ annual lab tests across two included rounds; add-ons available | No testing — you bring reports obtained elsewhere |
| Historical intake | Says upload past results; public format and source-field details are limited | Lab PDFs with extraction that should be checked against the source |
| Trend view | Tracks biomarker changes over time | Groups repeated report-derived markers over time |
| Output and exit | Says download/share; format is not public; access promised through billing-cycle end | PDF/CSV export; current terms say browse/export continues after lapse |
| Guidance | Clinician-reviewed product insights and a personalized protocol | Record organization, not Function's review or protocol workflow |
| Price | $365/year checked July 21, 2026; testing included; add-ons may cost extra | $250/year or $29/month; 14-day trial; no testing included |
| Published privacy scope | Product security and privacy statements; scope varies by data and relationship | Public policy covers the marketing site, not production-app health records |
Want the long version? Read our full guide: what to do with your Function Health results ›
Function says it uploads past results, but its public pages do not fully specify formats or preserved source fields. Libby specifies lab PDFs. Test the same difficult report in the path you plan to use.
Compare one repeated marker with the original reports. A shared line does not establish that laboratories, methods, units, or reference ranges are equivalent.
Download or export what each account offers and open it elsewhere. Confirm format, fields, post-term access, and the separate consequences of cancellation and account deletion.
Use Libby's 14-day trial to import one lab PDF, check the extracted facts against the source, inspect a repeated marker, and export the result before deciding.
14-day free trial · payment method required · PDF and CSV export · current terms say browse/export continues after lapse. See pricing.