Inside Tracker App Review (2025 Edition)

Introduction: My Shifting Health Data Landscape

I’ve always been fascinated by the power of data in guiding better health decisions. Whether it’s counting steps on the original Nike+ pedometer, measuring heart rate variability using my smart watch, or analyzing complex blood markers with the services listed below, each metric offers a glimpse into how our bodies function—and clues about how we might tweak our daily habits.

Last month, I decided to try Function Health (full review here), drawn to its powerful biomarker panels and annual membership model that helps me keep track of data over time with regular in-lab testing. The experience was excellent—comprehensive tests, a sleek interface, and clear lab results. Still, curiosity led me back to a previous service I’d used 3 years ago: Inside Tracker. The big question? Could Inside Tracker’s newer offerings (especially its $149 manual-upload plan) stack up against Function Health (and their $499 plan)?

Spoiler alert: After this experiment, I still find Function Health more robust overall—particularly for regularly updated tests and a more comprehensive health analysks. However, Inside Tracker’s $149 “data upload” feature is undeniably appealing if you’re on a budget or you already have recent blood test results from your standard physical. Below, I’ll share the full comparison, along with an interesting twist about biological age reporting on both platforms.

(Disclaimer: I’m not a medical professional—just an enthusiastic user who has tried multiple lab-interpretation services. Always consult an actual doctor for medical decisions.)

My History with Inside Tracker

I first stumbled upon Inside Tracker three years ago. At the time, I was intrigued by its promise to transform boring lab numbers (like LDL, HDL, or glucose) into a color-coded, user-friendly dashboard. I purchased the Ultimate Plan, for $499—which included a partner lab draw—and was pretty impressed. It was similar to my experience with Function Health, which you can read more about here. It includes: 

1. Easy to Understand Dashboard
   • Each biomarker was marked as Green (Optimal), Yellow (Needs Improvement), or Red (High Risk).
   • This visual format felt far more approachable than skimming through pages of raw lab data.
2. Actionable Suggestions
   • For each marker, Inside Tracker recommended specific dietary changes, supplements, or exercise routines.
   • The advice was generally supported by references to scientific studies, which I appreciated.

Although I valued these features, after a few years I pivoted to try other services—such as Function Health—when it became available.

My Experience with Function Health

Fast-forward to this year, and I’d been hearing buzz about a newer service: Function Health. What drew me in?

1. Regular In-Lab Testing, w/ a Larger Menu of Tests
   • Function Health’s membership structure helps you plan consistent biomarker checks through partnered labs.
2. Deep Biomarker Coverage
   • Depending on membership tiers, Function can test dozens of markers, sometimes more than Inside Tracker’s standard offerings.
3. Sleek Interface & Ongoing Updates
   • Function Health organizes results in a modern dashboard, encouraging you to stay on top of testing intervals and keep data fresh.

I tried Function Health for the last month, found it user-friendly and thorough, and enjoyed the clarity of scheduling lab visits. I also discovered a biological age feature that pegged my “body’s age” at 24.2—a funny way to brag to my buddies who are now “older than me.” 

Returning to Inside Tracker

Despite my positive experience with Function Health, I’m a data geek who loves to compare. So, when I got new lab results from Function, I decided to see how Inside Tracker’s manual-entry plan would handle them. For $149:

1. No New Blood Draw
   • I typed in the biomarker values I already had (e.g., cholesterol, ferritin, glucose, etc.).
2. Familiar Dashboard
   • Once I submitted the data, Inside Tracker’s trademark color-coded interface lit up, showing which results were green, yellow, or red.
3. Cost-Effective
   • Perfect if you have labs in hand and just want an updated snapshot without paying for Inside Tracker’s in-lab test packages.

My Manual-Upload Experience

Entering the biomarkers took roughly 10–15 minutes. About 95% of them processed flawlessly, though I encountered a minor hiccup inputting folate and magnesium. Inside Tracker gave me an “invalid format” message, so those markers remained untracked—somewhat frustrating, but not a deal-breaker.

The Battle of the Biological Ages

Interestingly, both Function Health and Inside Tracker now offer a concept of biological (or inner) age, presumably derived from biomarker data. Here’s the kicker:

• Function Health gave me a fairly generous 24.2 years “body age” in January 2025
• Inside Tracker showed 33.1 as my InnerAge—a full nine years older than Function’s estimate!

Worse, Inside Tracker hasn’t updated that number in over 3 years, because they only refresh “InnerAge” if you purchase a 1st-party Inside Tracker blood test (like the Ultimate Plan). Since I only paid for manual data upload this time around, my “inner age” remained stuck at an outdated figure from years ago. This clearly impacted my sense of progress, since I’ve made improvements in my health habits since then—but the app wouldn’t reflect those changes without a brand-new (and pricier) Inside Tracker test.

What Is Inside Tracker (in 2025)?

At its core, Inside Tracker is a health-optimization platform that merges blood biomarker analysis, lifestyle factors, and optional DNA data to provide daily, science-backed recommendations. Just like Function Health. Its main features:

1. Blood Testing and Biomarker Analysis
   • Typically covers 40+ markers under metabolic, cardiovascular, inflammatory, or hormonal categories.
   • Lays out an “optimal” range that sometimes differs from standard clinical references.
2. Lifestyle & Diet Suggestions
   • Ties biomarkers to actionable strategies (e.g., more leafy greens for iron, moderate workouts for high cortisol).
3. Visual Dashboard
   • Color-coded bars that identify risk levels. Highly approachable.
4. InnerAge
   • A “biological age” metric that’s fun—if you keep it updated. However, it’s only refreshed if you do an Inside Tracker test, not if you manually import data.

Enhancement Idea: Wearable and Hardware Integrations

One feature I wish both Inside Tracker and Function Health had is seamless wearable and hardware integration. It would be ideal to pull in data from Garmin, Fitbit, Apple Health, Strava, Samsung Health, Google Fit—whatever you use—so that you could see how daily steps, sleep patterns, or physical activity might influence your long-term biomarker trends.

Even better, integrate with my Withings Smart Scale and import my weight and body composition data. As of now, neither service offers this kind of robust data syncing, making it harder to tie everyday habits directly to lab results. This missing link represents an opportunity for both platforms to evolve into a more holistic health dashboard.

My advice to the product development teams of these organizations: build a platform, or “operating system” that other companies and tools can build on top of. For more information, see my review on the Best Fitness Tracking Apps

Inside Tracker vs. Function Health: Pricing

Inside Tracker Pricing

• Ultimate Plan ($589 – $649+)
  • Comprehensive in-lab test, analyzing 40+ biomarkers, plus a new InnerAge calculation.
• Essentials Plan ($189 – $200+)
  • Fewer markers, typically focusing on metabolic health.
• Advanced Plans ($689 – $900+)
  • Specialized testing for hormone or genetic data.
• Manual Upload ($149)
  • No new test. Perfect if you already have current blood work from a doctor or another service (like Function Health).
  • Does not update your Inside Tracker InnerAge metric, as that seems tied to their own full test purchases.

Function Health Pricing

• Membership Tiers ($499+/year)
  • Based on how often you schedule in-lab tests and how deep you want your biomarker analysis.
• Lab Visits
  • The membership covers regular testing at partner facilities; extra tests can cost more depending on your tier.
• Biological Age
  • Function Health provides its own version of a “body age” metric, recalculated with each new lab test, pegging me closer to 24.

For a deeper look at Function Health’s approach, see my dedicated review of Function Health.

Inside Tracker Usage

After using the $149 plan to import my latest labs, here’s how Inside Tracker factored into my routine:

1. Dashboard Check
   • The color-coded approach quickly highlights which markers need attention (e.g., borderline cholesterol or low iron).
2. Lifestyle Tips
   • Inside Tracker recommended particular foods and exercise regimens for any yellow or red zones I was hitting.
3. Biological Age Limitations
   • My “InnerAge” remained at 33.1 from three years ago. Despite having new labs, I won’t get a recalculation unless I pay for Inside Tracker’s in-lab test.

Why I Ultimately Prefer Function Health (But Still Use Inside Tracker)

1. More Frequent Updates with Function

Function Health’s membership tiers help me plan consistent testing throughout the year, keeping data fresh and my “body age” recalculating regularly.

• Inside Tracker: Great for sporadic checks or manual uploads, but “InnerAge” won’t change unless you buy a full Inside Tracker test panel.

2. Deeper Routine Testing

If you’re a data fiend wanting multiple lab draws a year, Function’s membership can be more seamless—though more expensive. Inside Tracker also gets pricey if you purchase multiple in-lab tests within a short span.

3. Inside Tracker’s Strength = Analysis of Existing Labs

If you already have lab results and don’t want another draw, Inside Tracker’s $149 plan is a huge plus. It’s cheaper than paying monthly fees if you’re not planning frequent labs.

Product Enhancement Suggestions for Both Services

1. Demographic Comparisons
   • Show how my biomarkers stack up against other people in a similar age range, region, or activity level.
2. More Comprehensive Wearable and Platform Integrations
   • Sync with fitness apps and devices to correlate daily steps, heart rate, or sleep with biomarker changes. For specific examples, see my review on Best Fitness Trackers
3. InnerAge Updates for Manual Upload
   • Inside Tracker should allow “InnerAge” recalculation for a smaller fee if valid labs are uploaded. It’s a letdown that my “inner age” is stuck at 3 years old data.

Additional Research and Public Perception

1. Reddit’s r/Biohackers: When I searched around Reddit for comments and reviews of InsideTracker, I noticed that users appreciate Inside Tracker’s color-coding and tips but want more advanced data correlation, as well as updated “InnerAge” metrics for manual uploads. Just like me. 
2. Personal Health Blogs: When I did the same and reviewed popular blogs mentioning Inside Tracker, I noticed that they praised Inside Tracker’s user-friendly design, even though cost was often brought up as an important consideration. 

Pros & Cons of Inside Tracker

Pros

1. Budget-Friendly for Existing Labs
   • The $149 manual upload is ideal if you already have blood work.
2. Clean, Color-Coded Dashboard
   • Easy to interpret which markers need attention.
3. Actionable Recommendations
   • Dietary, supplement, and lifestyle tips, often referencing peer-reviewed studies.
4. No Monthly or Annual Subscription
   • Unless you want multiple new in-lab tests from Inside Tracker, you pay as you go.
5. Mobile App
   1. Unlike Function Health, Inside Tracker has a mobile app. Though worth noting, that the Function Health website is mobile optimized, which means both services are usable when on the go.

Cons

1. InnerAge Stagnation
   • Stays locked at old data unless you purchase an Inside Tracker–run test.
2. Potential Data-Entry Errors
   • Certain biomarkers (like folate or magnesium) might trigger formatting errors.
3. Limited Testing Frequency
   • If you’re someone who needs multiple new panels, Inside Tracker can get pricey.
4. No Robust Wearable Sync
   • Like Function Health, it lacks deep integration with fitness apps or devices.

My Final Verdict & Recommendation

Having tried Function Health recently, I find it more appealing if you want regularly scheduled lab tests and dynamic updates to your “body age.” But if you already have labs in hand and simply need an in-depth analysis, Inside Tracker is a great, budget-friendly option—especially the $149 manual-entry plan.

Bottom Line: For consistent, scheduled in-lab testing, Function Health might be your top pick. But if you only test occasionally and already have lab data, Inside Tracker offers a cost-effective way to interpret those results, turning them into color-coded insights and actionable advice. Keep in mind that your “InnerAge” won’t budge unless you purchase a new Inside Tracker test.

(Disclaimer: I’m not a physician. These insights come from personal use and research. Always consult a medical professional for tailored advice.)