Updated October 15, 2026. By FitScript Editorial.
Function Health and InsideTracker both turn blood testing into a health plan, but they are built differently. Function Health sells a yearly membership with twice-yearly testing included. InsideTracker sells a yearly platform membership, with blood tests bought on top or in a bundle, and adds DNA and wearable data to its analysis. FitScript publishes this page and is shown alongside them as a third option built around reading the labs you already have. Every fact below is linked to where it came from.
FitScript publishes this comparison and is one of the services compared. Competitor facts come from each company's own website as of October 15, 2026. Prices and features change, so check their current terms before you decide.
| Topic | Function Health | InsideTracker | FitScript |
|---|---|---|---|
| Price | $365 per year, charged annually. Function notes that membership renews at the then-current price. [6] | Membership $149 a year with no blood test, or $489 a year with one Ultimate Blood Test included. [7] | Protocol $20 per month including a 7-day trial, cancel anytime. Peak $99 per month or $999 per year, adding provider access and two group coaching calls a week. [1] |
| Lab testing | 160+ lab tests a year, with 100+ at the annual visit and 60+ at a mid-year retest. [8] | The Ultimate Blood Test looks at up to 54 biomarkers across 10 healthspan categories. [9] | Panels priced one at a time, from $49 to $499. Up to 149 biomarkers across 11 systems, read against optimal ranges. [2] |
| Where you test | 2,000+ Quest labs in 48 states, or an at-home draw with a licensed specialist. [8] | A Quest lab in the US, or a mobile blood draw. Mobile draws are required in NY, NJ, RI, AZ and HI. [10] | A digital requisition valid at 3,000+ Quest and Labcorp locations, or at-home phlebotomy in select areas. [5] |
| Results timing | First results typically arrive within 48 hours of testing. [8] | Blood analysis and recommendations 7 to 10 business days after an Ultimate test. [11] | 3 to 5 business days for FitScript Essential, up to 7 to 10 for Heavy Metals. [5] |
| Clinician and AI support | Clinicians review every result. Members can connect Function to AI partners such as ChatGPT, Claude and Perplexity. [8] | Terra, an AI health guide that uses your data, plus a customisable Action Plan. [12] | Atlas, the AI that reads your labs, on every plan. Peak adds provider access and two group coaching calls a week. [1] |
| Labs from elsewhere | Upload results from your doctor to track them in one place. [8] | Members can upload past results as PDF, PNG or JPEG files. [13] | Upload PDFs or photos of lab reports from Quest, Labcorp, other testing services or your doctor. [3] |
| HSA and FSA | Listed as HSA/FSA eligible. [6] | Blood testing plans can be paid with an HSA or FSA card through Truemed. [14] | Each lab panel page lists the panel as HSA/FSA eligible. [5] |
Function lists one membership at $365 per year, charged annually, which it also expresses as $1 a day. Its pricing page states that the membership renews at the then-current price, and its FAQ notes that testing in New York and New Jersey can cost more because of state regulations. The membership covers 160+ lab tests a year, clinician review of every result, a personalised protocol and member pricing on MRI and CT scans. Function is insurance-free and provides an itemised receipt for HSA or FSA reimbursement.
On flexibility, Function states that members can cancel and rejoin at any time.
InsideTracker lists the InsideTracker Membership at $149 as an annual platform fee, with no blood test included. Membership with one Ultimate Blood Test is $489, including the annual platform fee, and InsideTracker calls it the most popular option. Bundles bring the price per test down. Membership with two Ultimate tests is listed at $761, down from $829, and membership with four is listed at $1,305, down from $1,509. Members can also buy Ultimate tests on their own at $340 each, or $578 for two and $1,088 for four.
InsideTracker's help centre states that memberships are annual and that you can cancel at any time, keeping access to the platform until the membership expires one year from activation. Add-ons listed on its tour page include InnerAge for biological age, a DNA kit and an Estradiol and Progesterone test.
Function splits its 160+ yearly tests into two visits. The Annual Test covers 100+ biomarkers, and the Mid-Year Test covers 60+ biomarkers to track change, which Function says must be used before the annual renewal. Its published menu runs across heart, thyroid, hormones, metabolic health, liver, kidneys, nutrients, environmental toxins and autoimmunity, and includes markers such as ApoB, lipoprotein(a), LDL particle number, omega-3 levels and heavy metals such as mercury.
Function also lists practical details. Members fast for 8 hours and avoid seafood for 48 hours before heavy metal tests. Some members need two visits, for example people with an active menstrual cycle, so hormones are drawn at the right time, and members in Arizona because of state processing rules. Function is open to adults 18 and over who are not currently pregnant.
InsideTracker's Ultimate Blood Test looks at up to 54 biomarkers. Its help centre groups them into 10 healthspan categories, among them heart health, hormone balance, sleep, inflammation, metabolism and recovery, with markers such as ApoB, hsCRP, HbA1c, fasting insulin in the US, cortisol, SHBG, ferritin, vitamin D and RBC magnesium. Estradiol and progesterone are add-ons at checkout.
InsideTracker also offers a DNA kit, which it says covers up to 38 wellness traits based on 20,000 genetic markers, and an InnerAge analysis for biological age. Its site describes InsideTracker as combining blood, DNA, biological age and wearable data in one platform.
In the US, InsideTracker states that you can test at a nearby Quest lab or choose a mobile blood draw, where a phlebotomist comes to you. Members in New York, New Jersey, Rhode Island, Arizona and Hawaii must choose the mobile draw, which InsideTracker explains is because the law in those states keeps Quest from running discretionary bloodwork ordered through third-party companies. Members can instead test at a Quest location in another state if they select that state when activating the test. Canada is served with the mobile draw, and other countries can use a membership for uploaded results.
InsideTracker asks for a 12-hour fast before every blood test, no strenuous exercise for 48 hours, no alcohol for 24 hours and a morning test for the most accurate cortisol reading. It also asks members taking biotin to stop at least 72 hours before testing.
Function states that the first batch of results typically starts arriving within 48 hours of testing. Each result comes with explanations written by doctors, action items and a clinician's full summary, and Function says a healthcare provider will call right away if a result is critical. Members can download results as a PDF to share with their own doctor.
InsideTracker states that blood analysis and recommendations for InnerAge and Ultimate plans are available 7 to 10 business days after the blood test, with an email when results are ready. DNA kit results take 4 to 6 weeks after the kit arrives. Members see healthspan category scores, an InnerAge estimate and an Action Plan of recommendations, with a new habit goal each week.
Function states that clinicians review every result and flag issues. For AI, members can stay in Function's Private AI Chat or securely connect their results and clinician notes to vetted partners including ChatGPT, Claude and Perplexity. Questions about membership or results go through member chat, and Function describes its service as deeper insight to use alongside your existing care.
InsideTracker describes Terra as an AI health guide that uses your data to answer questions and guide health decisions. Its recommendations are built into an Action Plan that you can customise by swapping actions in and out, and its site states that the plan draws on an evidence base of more than 7,000 studies. InsideTracker's help centre points members with questions about specific markers to its knowledge base and blog.
Function lets members connect supported apps under Connected Apps to sync their health data, and invites members to upload results from their own doctor so everything is tracked in one place over time.
InsideTracker members can upload past lab results from the dashboard as PDF, PNG or JPEG files, review what was scanned and then receive an analysis. If the automated process has trouble, members can enter results by hand or ask InsideTracker's data team to check them, which it says takes 3 to 5 business days. InsideTracker lists wearable connections for Fitbit, Garmin, Oura Ring and Apple Health on iOS.
If you already get bloodwork through insurance and mainly want it interpreted, a reading membership may be the smaller cost. If you want several large panels a year with DNA and wearable data analysed together, a bundle built for that may suit you better. Prices change, so check each company's current pricing before you decide.
Function offers a large amount of testing for one published yearly price, with two scheduled draws so members can see change over a year. Its site lists 2,000+ Quest labs in 48 states, an at-home draw option, first results typically within 48 hours and clinician review of every result. Members who want imaging can add an annual MRI.
For people who want a broad, recurring panel managed for them and like having clinicians review the results, that structure is easy to follow.
InsideTracker brings several kinds of data into one analysis. Its site lists blood biomarkers across 10 healthspan categories, an optional DNA kit, biological age through InnerAge and wearable data, with recommendations ranked by the impact they are likely to have. It describes more than ten years in wellness technology and a peer-reviewed study of more than 20,000 users.
InsideTracker also encourages a steady testing rhythm. Its help centre recommends retesting every three months to see how biomarkers respond, and its multi-test bundles lower the price of each test for people who plan to do that.
Function is a good fit for someone who wants a broad panel twice a year, with clinician review of every result, the option of an at-home draw and member access to MRI and CT. Its scheduled mid-year retest suits people who want to see change within a year without planning it themselves.
InsideTracker is a good fit for someone who wants blood, DNA and wearable data analysed together, likes a customisable plan focused on nutrition, supplements, exercise and lifestyle, and plans to retest every few months to track change.
FitScript publishes this page and is shown in the table as a third option. It is built around reading the labs you already have rather than around one fixed testing bundle. Protocol is $20 per month including a 7-day trial and covers Atlas, its AI, the Health Score and personalised recommendations on uploaded labs. Lab panels are sold one body system at a time, from $49 for a single test to $499 for FitScript Complete, and Peak adds provider access and two group coaching calls a week.
Its upload page accepts PDF reports from Quest, Labcorp, other testing services and hospital systems, as well as phone photos of paper printouts, and states that Atlas has a read in under a minute. So results from either service compared here can be uploaded and read against optimal ranges.
See Upload your labs, FitScript pricing, FitScript Essential
Start with the tests you actually want. A large biomarker count is useful when it covers the systems you care about, such as thyroid, hormones, heart, liver and kidney health. Read each provider's published list and look for the specific markers you have been told to watch, for example ApoB, fasting insulin or free T3, rather than comparing totals alone.
Next, think about how often you will retest. Seeing a number move after three or six months is often more useful than a single snapshot, so include the cost of a second draw in any yearly total. Check where you can be drawn, how long results take and whether a clinician reviews anything outside the standard range.
Finally, look at what happens after the results arrive. Some people want a clear written plan, some want to ask questions about their own numbers, and some want a licensed provider involved. Membership terms, renewal pricing and HSA or FSA eligibility are worth reading closely too, since they change over time.
Choose based on what you need most. Function Health sells a yearly membership with twice-yearly testing included. InsideTracker sells a yearly platform membership, with blood tests bought on top or in a bundle, and adds DNA and wearable data to its analysis. Read each company's current terms, since prices and features change.
Whatever you choose, a licensed clinician is the right person to interpret results that fall outside the standard range and to decide on any treatment.
As listed on Function Health's own site on the date shown on this page. $365 per year, charged annually. Function notes that membership renews at the then-current price. Check Function Health's current terms, since prices and features change.
As listed on Function Health's own site on the date shown on this page. First results typically arrive within 48 hours of testing. Check Function Health's current terms, since prices and features change.
As listed on Function Health's own site on the date shown on this page. 2,000+ Quest labs in 48 states, or an at-home draw with a licensed specialist. Check Function Health's current terms, since prices and features change.
As listed on InsideTracker's own site on the date shown on this page. Membership $149 a year with no blood test, or $489 a year with one Ultimate Blood Test included. Check InsideTracker's current terms, since prices and features change.
As listed on InsideTracker's own site on the date shown on this page. Blood analysis and recommendations 7 to 10 business days after an Ultimate test. Check InsideTracker's current terms, since prices and features change.
As listed on InsideTracker's own site on the date shown on this page. A Quest lab in the US, or a mobile blood draw. Mobile draws are required in NY, NJ, RI, AZ and HI. Check InsideTracker's current terms, since prices and features change.
Atlas is FitScript's AI. It reads every marker against optimal ranges as well as the standard range, builds a daily protocol and answers follow-up questions about your own results. The FitScore is one score built from your results, tracked over time.
Many people retest a panel after about three months to see whether changes in sleep, training or diet have moved the numbers, then every six to twelve months once results are steady. A clinician can suggest a schedule based on your own results.
No. FitScript publishes it and is one of the services compared. Every competitor fact links to that company's own site and shows the date we read it, so you can check anything that may have changed.
Function Health and InsideTracker are trademarks of their respective owners. FitScript is not affiliated with or endorsed by Function Health and InsideTracker.