On the Wrist
The most crowded shelf in the catalog, and the one with the strongest opinions about fit.
Stated in days
Stated in hours
Two orbits, because 2 of these categories quote days and 3 quote hours, and those do not go on one ring. Each arc is the largest figure any listing in that category states. The remaining category, Electrical Stimulation Units, states no figure at all.
A reference for the two numbers a listing keeps apart
Two numbers, never printed together
How long a wearable runs between charges, and what you keep paying after you own it. A tracker advertises seven days. A band advertises fourteen. One of them will not work at all without a membership, another puts its headline features behind an app fee, and a third includes three months of a subscription and then quietly stops. None of that is on the front of the box. All of it is in the listing, for anyone who reads that far. This site read all 50 of them.
Five ways a listing handles the recurring part
Not one figure below is a sum of money. This site records which of five arrangements a listing describes and refuses to print a rate, because a rate that was right in spring is a lie by autumn.
Membership Required
The hardware arrives. The product does not start until the membership does.
1 listing
Trial Included, Then Optional
Three months included is a start date and an end date. Listings print the first one.
3 listings
App Fee for Some Features
A listing that mentions an app fee at all is a listing worth reading twice.
1 listing
No Fee Stated
This is a fact about the listing. It is not a fact about the product.
17 listings
No App, No Subscription
No account, no pairing, no terms page. The oldest arrangement in the catalog.
28 listings
Regulated medical devices in this catalog
What a stated figure measures, category by category
6 categories, 13 listings that state a figure and 37 that do not. The middle column is the one that matters.
| Category | Stated runtime range | What that figure measures there | Subscription | Page |
|---|---|---|---|---|
| Fitness trackers and smart rings | 7 to 14 days 4 of 7 listings | The one wrist category where a listing will commit to a week, and the reason it can. | Membership required, App fee for some features, No fee stated, Trial included, then optional, Not applicable | Tracker and Ring Runtime |
| Smartwatches | 14 days, stated once 1 of 10 listings | A watch runtime is a display setting wearing a number as a disguise. | No fee stated, Trial included, then optional, Not applicable | Smartwatch Runtime |
| Earbuds and in-ear headphones | 30 to 60 hours 6 of 12 listings | The headline belongs to the case. The buds get the part nobody prints. | No fee stated, Not applicable | Earbud Runtime |
| Neck fans | 20 hours, stated once 1 of 8 listings | One number, three to five speeds, and no listing that connects them. | Not applicable | Neck Fan Runtime |
| Smart glasses | 10 hours, stated once 1 of 3 listings | A recording device with no stated recording time is a specific kind of gap. | No fee stated, Not applicable | Smart Glasses Runtime |
| Electrical stimulation units | No listing in this category states a figure 0 of 10 listings | Ten listings, zero stated figures. This page records that and nothing more. | Not applicable, No fee stated | Stimulation Unit Runtime |
Put three claims on the same scale
Pick a category and up to three devices. The arcs are drawn from the figures those listings state, and the numbers are printed whether the arcs draw or not.
1. Category
2. Up to 3 devices — 0 chosen
Result
Choose at least two devices from one category. A comparison of one device is not a comparison, so nothing is drawn until there are two.
How the arcs are drawn
- arc sweep = stated figure ÷ full turn
- full turn = 30 days on a days orbit, 72 hours on an hours orbit
- a figure at or above a full turn is drawn as one complete turn
Every figure here is stated by the manufacturer, under conditions the manufacturer chose, and none of it was measured by this site. Hours and days are not compared across categories, and there are no prices or subscription amounts anywhere on this site.
Five places on the body
Where a device sits sets the size of its cell, the sensors that fit, and whether you are still wearing it next month. Scroll sideways.
On the Finger
No screen, no strap, no adjustment. The trade is very simple and very final.
In the Ear
The only place on this list where fit changes what you hear, not just how it feels.
Around the Neck
A collar-shaped device with moving parts, worn under whatever else you have on.
On the Face
Every other form in this catalog points at the wearer. Two of these point at everyone else.
One catalog, two different units
A figure in days and a figure in hours are not two sizes of the same thing. They describe two different states of a device.
Measured in days
These are standby claims. The device is asleep almost all the time, waking on a schedule to sample something and to sync. The figure is really a statement about that schedule, and the schedule is a setting.
Measured in hours
These are use claims. Something is running the entire time: a driver, a motor, a radio. There is no cheap idle state to average against, which is why the numbers are so much smaller and so much more honest.
Which is why nothing on this site converts one into the other, and why the orbits are always drawn in a single unit with the unit written under them.
The catalog in four figures
- Listings read
- 50Across six categories, each one read for the two numbers rather than the feature list.
- State a runtime
- 13The rest print a feature list where the battery figure would go.
- Name a fee
- 5A membership, an included window or an app fee, stated somewhere in the listing text.
- Fee models
- 5Every listing in the catalog sorts into exactly one of them, on its own wording.
The five models, at length
Each page sets out what the listing says works without paying, what sits behind the payment, and the exact wording that put it in that group.
Membership Required
The hardware arrives. The product does not start until the membership does.
The listing puts the term in the product name itself: a 12-month membership, stated up front rather than in the description.
Trial Included, Then Optional
Three months included is a start date and an end date. Listings print the first one.
All three listings use the same construction: a named membership brand, a stated number of months, and the word included.
App Fee for Some Features
A listing that mentions an app fee at all is a listing worth reading twice.
The exact phrase is no app fee for standard features. The qualifier is in the listing, not added here.
No Fee Stated
This is a fact about the listing. It is not a fact about the product.
These listings do not use the words fee, membership or trial at all. That absence is the entire basis for the classification.
No App, No Subscription
No account, no pairing, no terms page. The oldest arrangement in the catalog.
The classification here is negative: it comes from what the listing does not contain, checked across the full listing text.
What one device costs you in attention
One listing, one length of ownership, and the two answers a product page never puts next to each other.
1. Category
2. Device
3. Years you expect to wear it — 1 to 3 or more
Nothing is counted until a listing is chosen, so this input is waiting rather than working.
4. Hours a day you use it — 1 to 8, your figure, not this site’s
Nothing is counted until a listing is chosen, so this input is waiting rather than working.
Result
Pick a device above. Until one is chosen there is nothing to read out, because every line below comes from a single listing rather than from an average.
The arithmetic, printed
- period in days = years × 365
- charges, days-based figures = ceiling( period in days ÷ stated days )
- hours of use = period in days × hours a day, both of which you choose above
- charges, hour-based figures = ceiling( hours of use ÷ stated hours )
- where a listing states no figure, no count is produced
Nothing in those lines is a number this site made up. The day count is the calendar, the stated runtime is the manufacturer’s, and the length of ownership and the hours a day are the two you chose above.
There are no prices and no subscription amounts anywhere on this site. Rates change, and a stale number is worse than none. What is recorded here is the shape of the arrangement, never the size of it. Rates and terms change, so check them with the manufacturer before you buy rather than after.
Six questions, answered straight
- Why is there no price anywhere?
- Because prices and membership rates move faster than a reference page does, and a number that was right in March is a lie in October. What is recorded here is which of five arrangements a listing describes, which changes far more slowly.
- Does “no fee stated” mean the product is free to keep?
- No. It means the listing text names no membership, trial or app fee. That is a fact about the listing. A listing that is silent about fees has not told you there are none, and several silent listings here name AI features that plainly run on something.
- Why are hours and days never in the same chart?
- A day figure describes a device mostly asleep. An hour figure describes a device doing its job continuously. Sixty hours of playback and fourteen days of standby are not two points on one scale, so they never get drawn on one ring here.
- Does IP68 mean I can swim in it?
- It means the product passed a defined ingress test. It is a test result, not a permission. Whether a manufacturer supports swimming, showering or diving with their product is stated by that manufacturer, and none of these listings states it.
- Why does the stimulation unit section explain nothing?
- Because those are regulated medical devices, and how one is used is a matter for the instructions in the box and for a clinician. This site lists them as products with their stated mode and pad counts, and that is the full extent of it.
- Can a wearable tell me something is wrong?
- This site records the feature names a manufacturer prints and does not turn any of them into a finding. A consumer wearable is not a medical device unless the maker states a clearance for a specific function, and anything about your health belongs with a clinician.
One listing from each of the 6 categories
6 cards, one per category, each the listing that best answers what its category is here for. The reason for every badge is printed on the card.
This site links to retailers through affiliate links and may earn a commission from a qualifying purchase. It carries no prices, no ratings and no testing of its own, so there is very little for a commission to influence.
Longest stated runtime here
WHOOP 5.0 with 12-Month Membership
- Stated runtime
- 14 days
- Subscription
- Membership required
Why that badge
Stated 14 days. No other tracker listing in this category states a figure that high, and 14 appears once.
Only stated runtime in this category
Amazfit Bip 6, 46mm
- Stated runtime
- 14 days
- Subscription
- No fee stated
Why that badge
Ten smartwatch listings, one battery figure. This one. Counted across every listing on this page.
Only listing here to state IPX8
TOZO NC9
- Stated runtime
- 60 hours
- Subscription
- No fee stated
Why that badge
Twelve earbud listings. IPX8 appears in one of them, this one.
Longest stated runtime in this category
SWEETFULL Portable Neck Fan
- Stated runtime
- 20 hours
- Subscription
- Not applicable
Why that badge
Stated 20 hours. The highest figure stated by any neck fan listing here, and 20 appears once.
Only stated camera resolution in the catalog
Meta Ray-Ban Gen 1 Wayfarer Large
- Stated runtime
- Not stated
- Subscription
- No fee stated
Why that badge
A stated 12 MP. No other listing among all 50 states a camera resolution at all.
States 30 modes and 12 pads
AVCOO 3-in-1 Unit, 30 modes
- Stated runtime
- Not stated
- Subscription
- Not applicable
Why that badge
Four formal values stated: modes, intensity levels, pads and rechargeable operation.
Three things worth being stubborn about
Fourteen days and sixty hours are not comparable
A tracker that states fourteen days is describing a device that is asleep almost all of the time, waking to sample a sensor and to say hello to a phone. A pair of earbuds that states sixty hours is describing a case that can refill two very small cells several times over.
One is a standby claim. The other is a use claim, and it is not even a use claim about the part in your ear. Putting them side by side on a single axis makes the earbuds look four times better than they are, which is exactly why this site keeps them on separate rings.
An included membership is a term, not a gift
Three listings in this catalog state a three-month included membership. That sentence has a start date in it and an end date behind it, and the listing prints only the first one.
None of the three says which features stop when the window closes. That is the question worth asking before you buy rather than in month four, and the whole reason this site sorts by fee model instead of by feature count.
A rating class is a test, not a promise
IP68, IPX5, IPX8 and 3ATM all appear on listings here. Each one is a result from a defined bench test under set conditions: a fixed pressure, a fixed duration, still water, no soap, no temperature swing.
Swimming is none of those conditions. A manufacturer can tell you what their product supports in water, and only they can. A class on a listing tells you a test was passed and stops there.
How this site is written
Six rules, applied to every page, including the ones that made the writing harder.
- A figure is recorded only if a listing states it. Where a listing states none, the field says so rather than borrowing a number from a similar product.
- A manufacturer’s feature name stays a feature name. Nothing here turns a named sensor into a claim about what it knows.
- No prices, no rates, no ratings, and no testing done here. Every runtime figure on the site belongs to the manufacturer who printed it.
- Regulated medical devices are listed as products with their stated formal values and nothing else. No usage information appears anywhere on this site.
- Every badge prints its own basis on the card, so a claim of only or longest can be checked against the listings rather than trusted.
- Counts beside a list are computed from the list. If a number here says six, six things were rendered.
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