Your body is constantly telling you how it is doing. The problem is that most of us only listen once a year, at a routine physical that checks a dozen or so basic markers. Direct-to-consumer health platforms set out to change that by giving you deep lab testing, continuous monitoring, and clear guidance on what to actually do with the results.
Two of the most established names in this space are Function Health and InsideTracker, and they take noticeably different paths to the same goal. Function Health leads with breadth: a 100+ biomarker blood panel twice a year, read by clinicians. InsideTracker leads with context: fewer blood markers, but layered with DNA insights, a biological age score, and an algorithm built around performance and longevity. This guide breaks down Function Health versus InsideTracker in detail, then adds a third option, OneTwenty, for readers who want their results acted on continuously rather than reviewed once or twice a year.
The Quick Verdict
Function Health vs InsideTracker vs OneTwenty: Comparison Chart
| Feature | Function Health | InsideTracker | OneTwenty |
|---|---|---|---|
| Annual price | $365 | ~$489 (Ultimate + Membership) | $499 |
| Blood draws / year | 2 | 1 (Ultimate test) | 4 (quarterly) |
| Blood biomarkers | 100+ per panel | Up to 48 per Ultimate test | 78 baseline, 20 to 40 per follow-up |
| Genetic / DNA analysis | Minimal (a few markers) | ✓ DNA add-on, 38 wellness traits | Not a DNA platform |
| Testing frequency | 2x / year | Per test (3 to 6 mo recommended) | Every 90 days |
| AI & coaching | Clinician notes + action plan | Algorithm action plan + ProTips | ✓ 24/7 AI Health Coach |
| Wearable / device data | Limited | ✓ Apple, Oura, Fitbit, Garmin | ✓ Wearables + smart scale + BP, 500+ daily signals |
| Upload existing lab results | No | ✓ Up to 30 sets / year | No |
| Personalized supplements | Recommendations | Recommendations | ✓ Formulated & delivered, updated quarterly |
| Prescriptions (TRT / GLP-1 / HRT) | No | No | ✓ Direct access via licensed clinicians |
| HSA / FSA eligible | ✓ | ✓ | ✓ |
What Do They Actually Cost Per Test?
Pricing is where InsideTracker gets misunderstood. On paper its entry looks mid-range, but the model is pay-per-test, not a flat membership. The Ultimate blood test bundled with the required $149 membership runs around $489, and that buys you a single draw. Function includes two panels for $365. OneTwenty includes four for $499. The number that actually matters is cost per blood draw, and once you divide each plan by the draws it includes, they separate fast.
| Cost | Function Health | InsideTracker | OneTwenty |
|---|---|---|---|
| Annual price | $365 | ~$489 (Ultimate + Membership) | $499 |
| Blood draws / year | 2 | 1 | 4 |
| Cost per draw | ~$183 | ~$489 | ~$125 |
What Are Health Testing Platforms and How Do They Work?
A standard annual physical usually runs a complete blood count and a basic metabolic panel, often fewer than 20 markers in total. That leaves out a lot: advanced cardiovascular risk markers like ApoB and Lipoprotein(a), full hormone and thyroid panels, inflammatory markers, and nutrient status. These are the markers that tend to matter most for long-term health and optimization, and they are exactly what these platforms test.
The real difference between the platforms is not the marker count. It is the philosophy. A once-a-year panel gives you a snapshot. Testing several times a year shows you trends, which is where the useful insight lives. And the most advanced platforms pair lab data with continuous wearable signals, then actually adjust your plan as the numbers move. That shift, from a yearly report to a system that evolves with you, is the main thing to weigh as you choose.
The 3 Best Health Testing Platforms of 2026, Reviewed
OneTwenty Review
OneTwenty is built around a simple idea: your own data should drive your health plan, and that plan should keep changing as your body does. Most platforms test you once or twice a year and hand you a report. OneTwenty tests you every quarter, watches your wearables in between, and adjusts your protocol every 90 days based on what your numbers are actually doing. The name reflects the goal, living to 120 in good health, which takes more than a yearly snapshot. It is currently in open beta, accepting founding members ahead of public launch.
This is where OneTwenty separates from the rest. It is the only platform here that tests four times a year, then connects those labs to 500+ daily signals from your wearable, smart scale, and blood pressure monitor. When your numbers drift, your supplements get reformulated and your medications get titrated, every quarter. Instead of acting on a single annual data point, your plan tracks your real biology in close to real time.
- Quarterly blood panels: 78 targeted biomarkers at baseline, then 20 to 40 focused markers every quarter, drawn at Quest locations nationwide, with at-home phlebotomy available.
- 500+ daily signals: Your wearable (Oura, Whoop, Apple Watch, Garmin), smart scale, and blood pressure monitor stream sleep, HRV, heart rate, body composition, and more into one dashboard.
- 24/7 AI Health Coach: It knows your labs, your wearable trends, and your protocol, and answers questions any time.
- Custom supplement delivery: Formulated from your labs and shipped in labeled morning and evening pouches, updated each quarter.
- Prescription access: When labs show clinical need, licensed clinicians can prescribe TRT, GLP-1s, HRT, and more. Most platforms can tell you a marker is off. OneTwenty can act on it.
- Quarterly protocol re-optimization: Every 90 days your labs and trends are reviewed, and supplements, medications, and recommendations are adjusted.
Strengths
- The only true continuous-optimization model here
- Quarterly testing instead of annual snapshots
- Deepest device integration (labs + wearables + scale + BP)
- Delivers supplements and prescribes medication in one place
Trade-offs
- Highest membership price of the three
- Medications and supplements billed separately
- Not a genetics platform if DNA is your main goal
Function Health Review
Founded in 2022 by Mark Hyman, MD, Function Health is one of the best-known names in direct-to-consumer lab testing. Its strength is breadth. The membership includes a comprehensive panel of 100+ biomarkers plus a follow-up panel about six months later, with clinician notes and a personalized action plan. In 2026 Function lowered its price to $365 per year, down from $499, which makes it a strong value for people who primarily want wide diagnostic coverage and early detection.
- Broad panels: 100+ biomarkers per comprehensive panel across heart, thyroid, liver, kidney, metabolic, hormone, nutrient, and other categories.
- Clinician notes and action plan: Every biomarker is explained, with diet, supplement, and lifestyle recommendations, and a call for urgent results.
- Screening add-ons: Optional Galleri multi-cancer detection test and several MRI options at additional cost.
Strengths
- Excellent biomarker breadth for early detection
- Strong value at $365/yr for two panels
- Optional cancer and MRI screening
Trade-offs
- Twice-a-year testing, not continuous
- No real genetic analysis or biological age score
- No medication prescribing, limited wearable integration
InsideTracker Review
Founded in 2009 by scientists from Tufts and MIT, InsideTracker is the original data-driven optimization platform, and it still carries the deepest scientific pedigree in this group. Its Ultimate blood test analyzes up to 48 biomarkers across 10 healthspan categories like heart health, cognition, and endurance, then runs them through a proprietary algorithm that returns optimal ranges and a personalized action plan. What sets it apart is everything layered on top of the blood work: an optional DNA kit covering 38 wellness traits, the InnerAge biological age score, and the ability to upload blood results and 23andMe or Ancestry DNA you already have. It leans toward athletes and performance, and integrates with Apple Health, Oura, Fitbit, and Garmin.
- Genetic context: Optional DNA kit covering 38 wellness traits, plus free upload of 23andMe or Ancestry data, which neither Function nor OneTwenty offers.
- InnerAge: A biological age score that tracks how your habits shift your aging over time, available as a $99 add-on.
- Upload what you have: Bring existing blood results, up to 30 sets a year, into the platform for instant analysis instead of paying for a new draw.
- Performance focus: 10 healthspan category scores plus ProTips aimed at training, recovery, and longevity.
Strengths
- Only platform here with real DNA analysis and a biological age score
- Flexible: upload your own labs and DNA instead of buying new tests
- Strong fit for athletes and performance tracking
Trade-offs
- Tests far fewer blood biomarkers than Function (up to 48 vs 100+)
- Pay-per-test pricing climbs fast if you retest as recommended
- Recommendations are algorithm-driven, with no prescribing
Function Health vs InsideTracker: The Detailed Comparison
These two get compared constantly, but they are not really competing on the same axis. Function Health is a blood-testing platform first. It runs 100+ biomarkers, reads them with clinicians, and is built to catch problems early across as many systems as possible. InsideTracker tests fewer blood markers, up to 48, but wraps them in things Function does not really do: a DNA layer covering 38 wellness traits, the InnerAge biological age score, and an algorithm tuned for athletic performance and longevity. One is about diagnostic breadth. The other is about context and modeling.
Price works differently too. Function is a flat $365 a year for two panels, simple to understand. InsideTracker charges a $149 membership plus per-test fees, with the Ultimate test landing around $489 for one draw, and DNA and InnerAge stacked on top as paid add-ons. If you follow InsideTracker's own advice to retest every 3 to 6 months, the real annual cost climbs well past what Function charges. So you are weighing wide, clinician-read bloodwork at a fixed price against a smaller blood panel enriched with genetics and biological-age modeling at a higher and more variable one.
| Feature | Function Health | InsideTracker |
|---|---|---|
| Annual price | $365 (2 panels) | ~$489 (Ultimate + Membership, 1 test) |
| Blood biomarkers | 100+ | Up to 48 |
| Genetic / DNA analysis | Minimal | DNA add-on, 38 wellness traits |
| Biological age score | No | InnerAge ($99 add-on) |
| Upload your own labs | No | ✓ Up to 30 / year |
| Lab partner | Quest | Quest |
| Wearable integration | Limited | Apple, Oura, Fitbit, Garmin |
| Screening add-ons | Galleri cancer test, MRI | DNA kit, hormone markers |
| HSA / FSA eligible | ✓ | ✓ |
Where Function Health wins
- More than twice the blood biomarkers per test (100+ vs up to 48)
- One flat annual price for two panels, easy to budget
- Wider early-detection menu with optional Galleri cancer screening and MRI
- Clinician-written notes on every marker
Where InsideTracker wins
- Real genetic analysis plus the InnerAge biological age score
- Upload existing bloodwork and 23andMe or Ancestry DNA instead of paying for new tests
- Stronger athletic performance and longevity framing
- More native wearable integration across Apple, Oura, Fitbit, and Garmin
Here is the honest bottom line on the two of them. Choose Function Health if you want the widest blood panel, clinician interpretation, and a simple flat price. Choose InsideTracker if you specifically want DNA context, a biological age score, and the flexibility to bring your own data, and you are comfortable with pay-per-test pricing. Both stop at the same place, though: they analyze and advise, but neither tests you quarterly, formulates your supplements, or prescribes medication. If you want a platform that closes that loop, that is where OneTwenty comes in.
Is OneTwenty Worth It?
At $499 per year, OneTwenty sits at the top of this group on membership price, but it is also the only one doing continuous optimization rather than periodic testing. For that price you get four lab panels a year, 500+ daily signals from your wearables, a 24/7 AI Health Coach, custom supplements formulated from your results, and prescription access through licensed clinicians, with your protocol adjusted every 90 days. Function charges nearly as much for two panels and a report. InsideTracker can cost more than OneTwenty once you add DNA, InnerAge, and the retests it recommends, and it still cannot prescribe or deliver supplements.
If you only want one annual snapshot, or you specifically want genetics, the other two will serve you for less or with different strengths. If you want your health actively managed and adjusted as your body changes, OneTwenty is the only option here built for that.
Sign up hereHow to Choose the Best Health Testing Platform
Six questions to ask before you subscribe
- Snapshot or system? Decide whether you want a yearly report or a plan that updates as your numbers change. This is the single biggest difference between these platforms.
- Blood breadth or genetic depth? Function tests the most blood markers. InsideTracker tests fewer but adds DNA and a biological age score. Know which one you actually care about.
- Do you want action, or just data? Some platforms only tell you what is off. Others deliver supplements and can prescribe medication to address it.
- What is the real cost? Look past the entry price to add-on DNA, InnerAge, at-home draw fees, and recommended retests, which can add up fast on a pay-per-test model.
- Does it use your devices? If you already wear an Oura or Apple Watch, a platform that integrates that data gives a fuller picture.
- How often will you test? Once a year shows a snapshot. Quarterly testing shows trends, which is where most of the insight is.
Frequently Asked Questions
Is Function Health or InsideTracker better?
It depends on what you want. Function Health is better for blood-test breadth and early detection, with 100+ biomarkers twice a year plus optional cancer and MRI screening. InsideTracker is better if you want genetic context, a biological age score, and the ability to upload your own labs, with a stronger lean toward athletic performance. If you want quarterly testing with supplements and prescriptions on top, OneTwenty goes further than either.
Which is more affordable, Function Health or InsideTracker?
Function Health is more affordable and simpler at a flat $365 per year for two panels. InsideTracker starts at a $149 membership, and its Ultimate test brings the total to around $489 for a single draw, with DNA and InnerAge as paid add-ons. Because InsideTracker recommends retesting every few months, the real annual cost can run much higher.
Does InsideTracker test your DNA?
Yes, as an optional add-on. InsideTracker offers a DNA kit covering 38 wellness traits, and you can also upload existing 23andMe or Ancestry data for free with a membership. This genetic layer, along with its InnerAge biological age score, is its main point of difference from Function Health and OneTwenty.
Which platform is best overall?
For continuous optimization, OneTwenty leads, because it tests quarterly, integrates daily wearable data, delivers custom supplements, prescribes medication when needed, and adjusts your protocol every 90 days. For blood-test breadth and early detection, Function Health is excellent. For genetics and biological age, InsideTracker.
How much do these platforms cost?
As published in 2026: Function Health is $365 per year for two panels, InsideTracker is a $149 membership plus per-test fees with the Ultimate test bundle around $489, and OneTwenty is $499 per year for four panels. DNA, InnerAge, medications, supplements, and add-on tests can cost extra.
How often should you test your biomarkers?
Once a year gives you a snapshot, which is fine for general screening. Testing two to four times a year reveals trends and lets you see whether the changes you make are working. Quarterly testing, as OneTwenty does, gives the most responsive picture.
Are they HSA or FSA eligible?
These memberships are generally not billed to insurance, but all three are HSA and FSA eligible, so you can typically pay with pre-tax dollars. Eligibility rules and documentation can vary, so check with your plan administrator.
How is OneTwenty different from Function and InsideTracker?
Both Function and InsideTracker test you periodically and give you a report or action plan. OneTwenty tests quarterly, monitors 500+ daily wearable signals in between, and actively adjusts your supplements and medications every 90 days. It is the only option here that both delivers supplements and prescribes medication in one membership.
Do I still need my regular doctor?
Yes. These platforms are designed to complement primary care, not replace it. Use the data to have a more informed conversation with your physician.
Final Verdict: Function vs InsideTracker vs OneTwenty
Between the two platforms most people compare, the choice is about what kind of data you want. If your goal is the widest blood panel, clinician interpretation, and a simple flat price, Function Health is worth its $365 a year. If you want genetic insight, a biological age score, and the flexibility to bring your own labs, InsideTracker is the specialist, as long as you accept its pay-per-test pricing. Neither is a wrong answer; they optimize for different things.
But if you want a platform that does not just test you and hand you a report, one that monitors your biology continuously and adjusts your plan as your body changes, OneTwenty is the clear choice. Quarterly labs, 500+ daily signals from your wearables, an AI health coach, custom supplement delivery, and prescription access, all in one membership, with your protocol re-optimized every 90 days. No other platform here combines continuous monitoring with this much active optimization.
Want your health actively optimized, not just measured?
OneTwenty combines quarterly labs, daily wearable monitoring, a 24/7 AI Health Coach, custom supplements, and prescription access in one membership, with your protocol adjusted every 90 days. Open beta is accepting founding members ahead of public launch.
Sign up here
