How We Research

What we do not do

We do not test hair tools. Nobody here has held a Dyson Supersonic, timed a blow-dry, measured a decibel level or run a heat probe across a plate. There is no lab, no test bench and no drawer of loaner units.

We do not own the products we write about. We do not accept free product from manufacturers. We do not take payment for placement, for a ranking, or for favorable coverage, and no brand sees a page before it goes live.

We also do not employ a stylist, a trichologist or a dermatologist, and we do not have an expert panel. Where a question needs one of those, we say so and stop, rather than answering it anyway.

Those three numbers are the ones we can honestly put in a band, because zero is the good answer for all of them. What we cannot honestly claim is experience, so we do not claim it — and the rest of this page is what we offer instead.

Where every specification comes from

Every figure in every spec block on this site was read off the manufacturer’s own product page, and each product carries the URL it came from at the bottom of its block. Nothing is taken from a retailer listing, a press release, another publication, or memory.

The spec block has identical fields in an identical order on every product, and that sameness is the entire point. It is what lets you put two tools side by side and see not only how they compare, but which manufacturer declines to publish what.

What “Not published” means

Precisely this: the figure does not appear on the manufacturer product page we cite for that product. It is not shorthand for “we could not be bothered to look”, and it is never standing in for an estimate.

We leave those rows visible rather than dropping them, because the absence is information. The reason you cannot compare two hot air brushes on wattage is that neither maker states one, and hiding the blank would conceal exactly the thing worth knowing.

The running-cost formula

Written out, so you can check it and substitute your own numbers:

watts ÷ 1,000 × hours used per year × your price per kWh = annual cost

• Usage assumption: 15 minutes a session, 5 days a week — 65 hours a year. This is a stated assumption, not a measurement of anybody’s habits. If it is wrong for you, scale it.
• Electricity rate: 18.34 cents per kilowatt-hour, the U.S. average residential price for June 2026, from the EIA Electric Power Monthly. If your utility bill says something different, use that.
• Where a maker publishes no wattage, we render the formula rather than a number. There is nothing honest to compute.

The full worked table for every tool we cover is at what your hair tools cost to run. None of the ten competitor pages we examined during research published this figure.

The price-per-use formula

purchase price ÷ (uses per week × 52 × service life in years)

• Assumed usage: 5 uses a week.
• Assumed service life: 5 years — which is an assumption, not a durability finding. No manufacturer publishes an expected lifespan.
• Total: 1300 uses. Halve the life and every cost per use doubles.

We publish a price ladder — the arithmetic at a range of price points — rather than a worked example for a specific product. There are two reasons. A price typed into a sentence is wrong within a week, and this site never types one: prices render from the live price layer or the button says “check price”. And the ladder is more useful anyway, because it shows how quickly the per-use difference stops mattering.

How prices work on this site

Every price you see comes from a live price data layer, refreshed on a schedule, and is stamped with the date it was verified. If that data is more than 48 hours old, prices disappear from the site automatically and every button falls back to “Check price on Amazon”.

That is deliberate and it is stricter than it needs to be. A stale price is both an Amazon Associates policy problem and, more importantly, a reader who arrives at a checkout expecting a number that no longer exists. No price on this site is ever hand-typed into copy.

How we choose picks

In this order, and only from published information:

1. Fit to the page’s hair type or use case. A tool that is excellent for thick hair is the wrong answer on a fine-hair page, and we will say so rather than ranking it anyway.
2. Heat control. Heat-setting count and how low the low setting goes. This is the specification we weight above all others, because it is the one that decides whether a tool damages hair.
3. Completeness of published specification. A maker who publishes weight, cord length and voltage is letting you check them. A maker who publishes a wattage and stops is not.
4. Weight and cord length. Boring, published, and they decide whether you actually finish the job properly.
5. Warranty. The only durability figure anyone commits to in writing.

Notice what is not on that list: brand, price, how the tool looks, and anything about performance we would have to have measured.

Why every roundup names something to skip

Every roundup on this site names one product we would not buy, and explains why from published information. Zero of the ten competitor pages we examined during research does this.

It costs us money — we earn nothing when you do not buy something — which is precisely why it is worth reading. A site that recommends everything recommends nothing.

The rules we hold ourselves to on those verdicts: we criticize on verifiable grounds only. Price relative to published specification. Missing dual voltage. A short warranty. Fewer heat settings. Specs the maker declines to publish. We never invent a defect, never claim a failure rate we cannot source, and never imply we used the thing.

Frequently the skip is a genuinely good product that is wrong for that specific page — a Dyson Supersonic is our top pick for fine hair and our named skip for thick hair, on the same published figures.

When we cite research

A few pages, mostly in the heat damage section, rest on published science rather than on manufacturer specs. Those pages cite peer-reviewed papers by title, authors, journal and year, linked to PubMed.

Where the honest answer is that the published evidence does not settle something, the page says that instead of filling the gap with confident prose. There is a recurring search in this category asking whether ionic hair dryers cause cancer; we have not found a citable published source addressing it, so we state that rather than offering reassurance we cannot support.

How to check us

• Every spec block links its source. Click through to the manufacturer page and read the figure yourself.
• Every running cost shows its working — the wattage, the hours, the rate, and the arithmetic between them.
• Every price carries the date it was verified.
• Every scientific claim names its paper.
• Every page carries a visible “updated” date reflecting a real review, not a bumped timestamp.

Update cadence

The visible “Updated” date on every page reflects a real review. Bumping it without re-verifying would be the same category of lie as a false testing claim, and we treat it that way.

How to tell us we’re wrong

Email info@strandandsteam.com, or use the contact form. If you can point at the manufacturer page or the paper, we will fix it faster.

Material corrections are made promptly and noted on the page with a date, so you can see what changed. Our full standards are at the editorial policy.