Best Apps for Biological Age by Organ System

The short version, checked against each product's own live pages in August 2026: almost nothing on the market actually gives you a biological age per organ system. Most give you one number for your whole body, or they group results by system and attach no age to the grouping. If you want a per system read today, the honest answer is that you are choosing between partial versions of it, and the right choice depends on whether you want it from a blood draw or from the watch you already wear.

Three options cover most of what people mean when they search this:

SuperAge is free on iPhone, reads sleep, HRV, activity and more than 50 biomarkers, and rates cardiovascular, sleep and metabolic separately alongside a single biological age. It processes on the device rather than in a cloud. If you want to spend nothing and start this week, start here.

Function Health is $365 a year for 160 or more lab tests drawn twice a year, and it groups results into panels including hormones and thyroid, heart and metabolic, aging, and mental health and focus. It gives you far more raw material about your organs than any wearable can. It does not hand you an age per organ.

InsideTracker InnerAge 2.0 is $249 including a lab draw, or $99 added to an existing Ultimate Plan. It reads 17 biomarkers for men and 13 for women. Worth knowing before you buy: it returns one InnerAge number, not a per system breakdown, so if the breakdown is the reason you were searching, this is not the product that delivers it.

The comparison, at a glance

Every figure above comes from each company's own live pages, read in August 2026. Prices and panels change, so check before you buy.

Why the per system version is rare, and why it matters

A single biological age is a composite. Several parts of you are measured, each is scored against reference data for people your chronological age, and the scores are averaged into one figure. The averaging is the step that destroys the information you were looking for.

Two people, both 40, both handed a biological age of 44. The first is four years ahead on cardiovascular and exactly at their age on everything else. The second is eleven years ahead on metabolic and three years behind on musculoskeletal, and the two roughly cancel. Same output, completely different situations, and only one of them has anything specific to act on.

That is not a flaw in any particular formula. It is what a mean does to parts that are not moving together. The longer version of this argument is in what biological age by system actually means.

So when a product advertises biological age and does not break it out, you are not being short changed on precision. You are being handed a summary of things that were never moving together in the first place.

How to choose, by what you actually want

You want to spend nothing and see whether the idea is useful to you. SuperAge. It is free, it runs on data your watch already produces, and it keeps that data on your phone. It also publishes free PhenoAge and Klemera Doubal calculators on the web if you already have blood results and just want the arithmetic. This is the recommendation for most people reading this, and it is not our product.

You want real depth about your organs and you are prepared to pay for lab work. Function Health. One hundred and sixty tests twice a year is a genuinely different order of information from anything a wrist or a finger can infer, and the panel grouping gets you closer to a per system picture than a wearable will. Read it as a lab subscription with good presentation rather than as an aging product.

You want one number, cheaply, from blood, and you accept it is one number. InnerAge 2.0. Clear methodology, published biomarker counts, and a sensible three to six month retest cadence. Just do not buy it expecting the breakdown.

You already have several data sources and the problem is that none of them talk to each other. None of the three solves that, and it is a different problem. It is covered in how to combine bloodwork with wearable data.

The question worth asking before you pay for any of them

What changes on Monday if the number is bad?

This is the test that separates a useful product from an interesting one, and almost nobody applies it before paying. A biological age that arrives with no attached, specific, checkable next step is entertainment. A per system age that tells you the metabolic reading is the one carrying your average, and what to watch over the next fortnight, is a decision.

Two follow up questions that are worth as much:

Compared to whom? Every product above scores you against reference data drawn from other people your age. That answers what is typical, which is not the same question as what is normal for you. A reading three years ahead of the population may be exactly where you have sat for a decade, and the population comparison cannot see that. This is the difference between a reference range and a personal baseline.

How often does it update, and does anything change when it does? A number that moves twice a year on a blood draw is a different instrument from one that moves nightly. Neither is wrong. They answer different questions, and the second is only useful if something acts on the movement.

Where NUVARD fits, and what it cannot do yet

Disclosure before the rest of this section: I build NUVARD, so treat what follows as an interested party describing his own product rather than as a review.

NUVARD connects data from more than 300 devices and apps into one model and represents you as 15 body systems rather than as one score, with system level reads on the paid tiers. It sells no hardware, so no device gets favoured in the model.

The limitations, stated plainly, because a comparison page that wins every row is not worth reading:

• It launches on 21 August 2026. At the time of writing you cannot test any of this. Read the paragraph above as a statement of intent, not as a result.
• It draws no blood and runs no lab. It works from data you already generate or already have. If you have never had bloodwork done, Function Health or InsideTracker give you something NUVARD cannot produce on its own.
• System level reads sit on the paid tiers, not the free one.
• A model of one person needs history. On day one it knows almost nothing about you, and it will say so rather than inventing confidence it has not earned.

If what you want is the free version of this idea today, use SuperAge. If what you want is depth from a lab, use Function Health. NUVARD is for the case where you already have several sources and want them read as one thing.

What to do next

Pick by input, not by brand. If your data is a wearable, start free and on device. If your data is blood, buy the panel with the most tests per dollar and read the groupings rather than the headline age. If your data is both, and neither product can see the other half, that is the gap worth solving next.

None of this is medical care, and none of these numbers is a diagnosis. They are estimates built from reference data, and the useful part is the direction and the detail, not the figure itself.