The best health investments under $100 this Black Friday

Short answer

The best health purchases under $100 are boring, cheap and used every day: darkness for your bedroom, a validated blood pressure monitor if you or your doctor want home readings, a way to walk more, and — if you want feedback on stress and recovery — an accurate heart rate source or an app that reads the devices you already own. A sleep mask costs about $29–$78, a validated upper-arm blood pressure monitor typically $40–$65, a chest strap $60–$105 at list price, and walking costs nothing. Welltory Premium, the app we make, is $99 a year. None of these will fix your health on its own; they are worth buying only if you will use them on an ordinary Tuesday, not just on the day the box arrives.

What to skip: gadgets that promise to diagnose, cure or "optimize" you, blue-light glasses bought for sleep, a second tracker that measures what your first one already does, and subscriptions you will not open after December.

Before you blame yourself for "not sticking with" last year's gadget, check what it was actually able to tell you: a purchase that gives no feedback is easy to abandon, and that is a design problem, not a character flaw.

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Note: this guide is published by Welltory, which makes one of the seven items on the list. The other six are product categories, not brands, and we do not earn anything from them. Prices are US category ranges taken from the sources named under each item and checked on October 22, 2026, before tax; Black Friday prices change daily, so treat them as a reference point, not a quote. "Investment" here means where your money is most likely to be used, not a promise of a health result. Welltory is a general wellness product: it helps you track and understand your body's signals; it does not diagnose, treat or replace medical care.

Seven health buys under $100 at a glance

Sources for each price and study are under each item below and in the references.

What's actually worth buying for your health under $100?

We picked items by three questions: is there evidence it does something, will a normal person use it on a normal day, and does it cost less than $100 without a subscription trap. Here is each one, with the honest version of the case for it.

A validated upper-arm blood pressure monitor

Price: validated upper-arm monitors averaged about $65 in a 2023 review by the Center for Science in the Public Interest, with some validated US models around $40; unvalidated ones were cheaper, at about $30. Check today's price, but expect this range.

What it gives per dollar: a device that lasts for years and produces numbers a clinician can use. One reading in a clinic can be misleading — some people read high only at the doctor's office, others only at home — and home readings fill that gap. We explain how to take blood pressure at home step by step.

Evidence: in an individual patient data meta-analysis of 7,138 people with high blood pressure (Tucker and colleagues, PLoS Medicine, 2017), self-monitoring lowered clinic systolic blood pressure by 3.2 mmHg at 12 months compared with usual care. The detail that matters for your wallet: self-monitoring alone showed no meaningful effect (−1.0 mmHg), while self-monitoring combined with intensive support — such as a clinician adjusting treatment based on the readings — lowered it by 6.1 mmHg. The cuff is worth buying when the numbers go somewhere.

Buy it if: your doctor has asked for home readings, you have been told your blood pressure is borderline, or you care for someone who needs it monitored. Check before you buy: the American Medical Association's Validate BP list of validated devices, and choose an upper-arm cuff in your size. Wrist and finger devices are more prone to error in real life.

A sleep mask or blackout shades

Price: the sleep masks recommended by the Sleep Foundation (updated April 27, 2026) list at $29–$78, apart from a smart mask at $419 that we would not count here. A $29 mask used every night costs about 8 cents a night in its first year.

What it gives per dollar: darkness, which is the cheapest sleep upgrade there is. In a 2022 study in PNAS led by researchers at Northwestern University, healthy adults who slept one night with moderate room light (100 lux) instead of dim light (3 lux) had a higher heart rate during sleep and more insulin resistance the next morning. The researchers' practical advice: keep lights off, and use blackout shades or an eye mask if you cannot control outdoor light.

Evidence: a 2021 meta-analysis in Frontiers in Psychiatry pooled 35 studies with about 2,700 participants, mostly in intensive care, and found that eye masks and earplugs improved sleep quality scores. In three sleep-lab studies of healthy adults in a simulated intensive care unit, total sleep time rose by about 25 minutes. The authors call for caution: samples were small, methods varied, and an intensive care ward is noisier and brighter than most bedrooms. Read this as "helps when light or noise is the problem", not "improves everyone's sleep".

Buy it if: streetlight, early sunrise, a partner's screen or shift work puts light on your face. Skip it if: your room is already dark — then the money does nothing. More on light, noise and temperature in the bedroom.

A white noise machine — or the fan you already own

Price: the Sleep Foundation says most white noise machines are available for under $100; its travel pick lists at $40, and several popular models cost more than $100.

What it gives per dollar: a steady sound that masks the unpredictable ones — a door, a dog, traffic, a neighbor's TV. That is the honest benefit: it changes what you hear, not how your brain sleeps.

Evidence: weak. A 2021 systematic review in Sleep Medicine Reviews (Riedy, Smith, Rocha and Basner) looked at 38 studies of noise as a sleep aid and rated the quality of the evidence as very low; some studies suggested continuous noise shortened the time to fall asleep, and at least one suggested it could disrupt sleep. The lead researcher told Sleep Review he would not broadly recommend these devices on current evidence.

Buy it if: you sleep somewhere noisy and have already tried a fan or a free sound app and liked the effect. Skip it if: your room is quiet. A fan you already own or earplugs are a cheaper test.

A sunrise alarm clock

Price: Tom's Guide's best-sunrise-alarm list (updated October 20, 2026) has a budget pick at $49.99; its other picks cost $159 to $250. Under $100, you are shopping in the budget tier.

What it gives per dollar: a light that brightens gradually before your alarm, so you wake to light rather than to noise in a dark room. People who get up before sunrise in winter tend to like it most.

Evidence: limited. In a 2013 crossover study in Chronobiology International, 17 healthy young men on restricted sleep reported better well-being and mood after a simulated dawn than after dim light, with mixed effects on performance; the study was supported by a lighting manufacturer. A 2024 study in Clocks & Sleep of 29 people found that a combined light, sound and temperature wake-up system had little overall effect on grogginess compared with a standard alarm, and was funded by the company that made it. Pleasant, low-risk, unproven.

Buy it if: dark winter mornings are a real struggle and you like the idea. Skip it if: you expect it to fix your energy — and if low mood comes every winter, that is a conversation for your doctor, not a purchase.

A chest strap heart rate monitor

Price: list prices of popular chest straps were $59 to $104 in Tom's Guide's July 2025 round-up, with one premium model at $149; discounts commonly bring them under $80.

What it gives per dollar: typically the most accurate type of heart rate sensor at this price, because a chest strap reads the heart's electrical signal rather than light through the skin. It works with most training apps, and Welltory's Help Center says Welltory supports most Bluetooth (BLE) heart rate monitors that stream heart rate variability data, naming chest straps and armbands from Polar, Wahoo and Garmin; ANT+-only monitors are not supported.

Evidence: strong for accuracy. In a 2022 study in Sensors of 25 recreational adults, heart rate and RR intervals from a Polar H10 chest strap showed near-perfect agreement with an ECG at rest. Accuracy is not a health outcome by itself — it matters if you will use the data, for example for heart-rate-based pacing with a chronic illness or training zones.

Buy it if: you want precise heart rate or HRV without buying a watch. Skip it if: you will not wear a strap; it is a deliberate-measurement tool, not something you forget you have on.

A walking habit, with the step counter already in your phone

Price: $0. Most phones count steps already. A separate pedometer is optional.

What it gives per dollar: the best-studied health behavior on this list. In a 2022 meta-analysis of 15 cohorts and 47,471 adults in The Lancet Public Health (Paluch and colleagues), people in the highest step quartile (a median of about 10,900 steps a day) had a 53% lower risk of death during follow-up than those in the lowest (about 3,550). The benefit levelled off at about 6,000–8,000 steps a day for adults 60 and older and 8,000–10,000 for younger adults. These are observational data — people who walk more differ in other ways too — but the direction is consistent.

Evidence that counting helps: a 2007 systematic review in JAMA (Bravata and colleagues) of 26 studies found that pedometer users in randomized trials walked about 2,500 more steps a day than non-users, and that having a step goal was a key predictor of the increase.

Buy something only if: your current shoes hurt when you walk. Then comfortable shoes are a better health purchase than any gadget on this page. How step counters actually count explains why your phone and your watch disagree.

Welltory Premium — feedback on the devices you already own

Price: $99 a year on welltory.com/plans, "billed annually, auto-renews unless cancelled" (checked October 22, 2026). That is about $8.25 a month. App Store and Google Play prices and plans can differ, and a lifetime option is listed on the plans page. Welltory also has a free version.

Disclosure: Welltory publishes this guide. We list our own product as one option among seven, with the same three questions as the others.

What it gives per dollar: a way to read stress, recovery and sleep from hardware you already have. Welltory takes a heart rate variability (HRV) measurement with your phone camera, an Apple Watch, a Samsung Galaxy Watch or a compatible chest strap, and pulls in sleep and activity from Apple Health, Health Connect or Samsung Health. The camera gives a spot measurement when you start one — not 24/7 tracking. Premium adds unlimited measurements analyzed with 21 metrics, sleep analysis, weekly and monthly trends, experiments that test a habit on you, and a history kept beyond the 30 days the free version keeps.

Evidence: for the measurement, a 2022 study in Computer Methods and Programs in Biomedicine recorded 26 professional cyclists with Welltory's optical (photoplethysmography) measurement and an ECG at the same time: readings did not differ significantly and correlated strongly (r = 0.77–0.94) for both 1-minute and 5-minute measurements. That is one small study in elite athletes, and Welltory's Help Center notes camera readings are less reliable for people under 18 or pregnant. For outcomes, there is no evidence that an app on its own makes anyone healthier. What it can do is show you patterns — which nights, meals, workouts or meetings come before your harder days — so the other purchases on this list stop being guesses.

Buy it if: you want feedback without buying a new device, or you already have a watch or ring and want analysis on top. Skip it if: you only want one number in the morning — the free version does that — or you need a medical answer, which no app gives.

Black Friday for Welltory users: a special discount on Premium

From November 25 to December 1, 2026, use the code WelltoryBF40 at checkout. You see the final price before you pay. Premium is billed annually and renews automatically until you cancel.

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Which purchases help with stress and sleep the most per dollar?

If your budget is the whole $100 and your goal is stress and sleep, here is the order we would spend it in.

First, make the room dark. A mask at about $29, or a blackout curtain if a mask bothers you. It is the cheapest change with a measurable physiological effect, and it works every night without effort. Cost per night falls below 10 cents within a year.

Second, move more in daylight. Free. Walking outdoors gets you daylight, movement and a break from screens at once — three of the most reliable levers for both sleep and stress — and needs nothing new.

Third, add feedback, not more gadgets. Stress is hard to judge from the inside. Most people notice it only once it shows up as a bad night, a short temper or a crash. A tool that shows how your body responded — an HRV reading in the morning, a sleep pattern over a few weeks — is what turns "I should sleep more" into "I sleep worse after late meetings". If you already own a watch, that feedback can come from an app; if you want precision without a watch, from a chest strap.

Fourth, the nice-to-haves. A white noise machine if noise wakes you; a sunrise alarm if dark mornings are the problem. Both are fine purchases with modest evidence.

What does not need money at all: a consistent wake-up time, slow breathing for a few minutes before bed, caffeine before noon, and a phone that charges outside the bedroom. If you want a free way to practise the breathing, many apps include guided sessions — Welltory's breathing practices stay free after the trial.

A useful rule: divide the price by the number of days you will realistically use the thing in a year. A $29 mask used 300 nights costs 10 cents a use. A $99 subscription opened 250 mornings costs 40 cents. A $90 gadget used twice costs $45 a use — and that is the one to skip.

What's usually a waste of money on Black Friday?

None of these are brands; they are categories that tend to disappoint, with the reason why.

Gadgets that promise to diagnose, treat or cure. A consumer gadget under $100 that claims to detect a disease, "detox" you or replace a medical test is promising more than the category can deliver. If you need a diagnosis, the money is better spent on the appointment.

Blue-light glasses bought for sleep. A 2023 Cochrane review of 17 randomized trials found that blue-light filtering lenses may offer no short-term benefit for eye strain from computer use, and that it is unclear whether they affect sleep; the certainty of evidence was low. Dimming screens and lights in the evening costs nothing.

A second tracker that measures what your first one already does. If your watch already records sleep and heart rate, a ring or band that records the same things mostly gives you a second, slightly different number — and the two will disagree. We wrote about why your wearable and your feelings disagree, and about whether you need a new wearable at all.

Paying extra for precise sleep stages. Consumer devices are reasonably good at total sleep time and much less precise at telling light, deep and REM sleep apart — in a 2022 lab study in Sensors, agreement with polysomnography on sleep stages was about 60% for the ring and the band it tested. A more expensive model does not fix the limits of measuring sleep from the wrist or finger. Our guide to sleep trackers covers what they do well.

Supplement bundles and "stacks". A discounted bundle is still several products, most of which you will not be able to tell apart. If you are curious about one supplement, test one at a time; we explain how long supplements take to work and how to tell. For a side-by-side of where the money goes, see stress and sleep apps vs gadgets vs supplements.

Wrist and finger blood pressure devices bought instead of an upper-arm cuff. They are often cheaper or more convenient, but validated upper-arm cuffs remain the standard for home readings.

Any subscription you will not open after December. That includes ours. A yearly plan is a good deal only if you use it — set a reminder a few days before it renews, and decide again then.

How to choose if you have a chronic condition or low energy

If your energy is limited, the question is not "what is the best deal" but "what saves me effort". A cheap gadget that needs charging, pairing and daily attention can cost more energy than it gives back.

Pick things that work without daily effort. A sleep mask, blackout curtains and a fan ask nothing of you. Prioritize them over anything with an app, a battery and a setup screen.

Buy the blood pressure monitor if your care team will use it. Home readings are most useful when they go to someone who can act on them — that is what the research above shows. If you live with dizziness on standing or a condition like POTS, ask your clinician which readings they want and when, before you buy.

Use what you already own before buying new. If you pace your activity by heart rate, the watch or phone you have may be enough to start; a chest strap is an upgrade for accuracy, not a requirement. We wrote about pacing without a new wearable and about heart-rate pacing in more detail.

Choose feedback that respects your limits. A morning reading you can take lying down, in about a minute, is easier to keep up than a gadget you have to remember all day. The goal is to see your bad days coming earlier, not to collect more data.

Do not let a sale decide for you. There is no deadline on looking after yourself. If you are not sure, wait — a good purchase in January is still a good purchase.

And talk to your clinician before treating a symptom with a gadget. New or worsening symptoms — fainting, chest pain, breathlessness, exhaustion that does not lift with rest — need a medical assessment, whatever a device shows.

Buying a wellness gift: what to give and what to skip

Most people searching for wellness gifts or health gifts want something useful that does not feel like a hint. A few principles help.

Give comfort, not correction. A good sleep mask, a soft pair of walking socks, a blackout curtain for a bright bedroom or a sunrise alarm for someone who hates dark mornings all feel like care. A scale, a calorie tracker or a "get healthy" bundle can feel like a comment on the person's body.

Give a blood pressure monitor only if it was asked for. It is one of the most useful items on this list for the right person — for example, a parent whose doctor wants home readings — and an odd surprise for everyone else.

Give a subscription only with the person's agreement. Apps, including ours, renew automatically; a gift that becomes someone else's bill is not a gift. If you do give one, tell them how to cancel.

Give gadgets to people who already like gadgets. A chest strap is a great gift for a runner or a cyclist who trains by heart rate and a drawer item for almost anyone else.

The best health gift under $100 might be time. A walk together every weekend costs nothing and comes with the evidence in section six.

How to tell if your purchase is actually working

Whatever you buy, give it a fair test. The simplest method we know:

1. Write down a baseline before you start. For one week, note how you slept, your energy at 3 p.m., and anything you can measure — steps, resting heart rate, a morning HRV reading, a blood pressure average.

2. Change one thing. Start the mask, the walks or the morning readings — not all three at once, or you will not know which one helped.

3. Compare after two to four weeks. Look at the trend, not at one good or bad day.

Before you decide a purchase "didn't work" — or that you failed at it — check what your body already recorded. Often the mask was fine and the bad week came from three late nights in a row. We go through this step by step in is my wellness gadget working.

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How Welltory helps — and what it cannot do

Welltory is a general wellness app, not a medical device, and it does not sell hardware. It does not diagnose, and nothing it shows replaces a clinician.

What it does is help you track and understand signals your body already produces, using the phone, watch or strap you have. Paired with the other items on this list, it is the part that tells you whether they are making a difference.

A routine for testing any purchase on this list:

1. Measure at the same time each morning, before coffee and before your phone — with the phone camera, an Apple Watch, a Samsung Galaxy Watch, or a compatible chest strap. The camera takes a spot measurement when you start one; it does not track you around the clock.

2. Tag what changed. When the app asks what happened, answer with a tag — tapped, typed or spoken: "new sleep mask", "walked 40 minutes", "late meeting", "bad night".

3. Look at the week, not the day. Read your Health, Battery and Stress indicators — if your version shows them — alongside your sleep, and compare this week with the week before you started.

4. Run an experiment. Premium's experiments let you test one habit on yourself: measure, do the thing, measure again.

5. Keep the record. If you log blood pressure readings from your cuff, Premium's blood pressure diary can be shared with your doctor. Patterns in the app are connections worth discussing with your doctor, not proof of a cause.

What the free version keeps: one HRV measurement a day analyzed with five core indexes, breathing practices, blood pressure logging with a basic analysis, and syncing with Apple Health, Health Connect and Samsung Health; data older than 30 days is deleted. What Premium adds: unlimited measurements with 21 metrics, sleep analysis, trends, experiments and your full history.

What Welltory cannot do: measure blood pressure itself (you enter readings from a cuff), record your night passively without a wearable, detect a heart rhythm problem, or tell you what a symptom means.

Try Premium with the blog reader discount

The annual plan renews automatically until you cancel; the lifetime plan is a one-time payment.

For what tracking really costs over one and three years with different devices, see the real cost of health tracking; for how accurate the camera measurement is, how accurate HRV from a phone camera is.

A note for Black Friday: from November 25 to December 1, 2026, Welltory users can use the code WelltoryBF40 at checkout for a special Black Friday discount on Welltory Premium. Premium is billed annually and renews automatically until you cancel, and the checkout page shows the final price before you pay. See the Black Friday offer

Living with a chronic condition? Welltory Care is a paid support program built around the data you already collect, a community of people who share your symptoms, and medical experts who explain what the body is doing. Energy Lab is for women aged 18 to 65 with energy-limiting conditions such as ME/CFS, Long COVID, POTS and fibromyalgia; Migraine Lab is for women aged 18 to 65 living with migraine and opens on December 1, 2026. Read what Energy Lab is and what it costs and what Migraine Lab is and what it costs, or see how Care works in Welltory's Help Center. Care is peer support and education, not medical care.