Dyson Supersonic Review

Almost every hair dryer sold has three heat settings labeled with dots, bars or the words low, medium and high. Not one of those labels tells you a temperature, which means you cannot compare two dryers on the specification that decides whether they damage your hair.

The Supersonic publishes 212F, 176F, 140F and constant cold. That is the single most useful thing about it and it is the reason it appears on more pages of this site than any other dryer.

Quick picks

Ranked, with the reasoning underneath. Tap any row to jump to that write-up; tap the price to check it on Amazon. Prices come from the live layer, never from this page.

#	Product	Best for	Type	Price
1	Dyson Supersonic Origin Hair DryerThe one dryer that tells you what each heat setting actually is in degrees, which makes it the only one in the category you can plan a routine around.	Published temperatures on every heat setting	1,600W dryer	$399.99 · Amazon#ad
2	Shark SpeedStyle Pro Ionic Dryer (HD732)The rare dryer that publishes the numbers that matter: every heat setting in degrees, plus a ceiling it says it never exceeds at 230F, which is below every damage threshold in the literature.	A published temperature ceiling you can actually check	High-velocity dryer	$225.00 · Amazon#ad

#1 · Published temperatures on every heat setting

Dyson Supersonic Origin Hair Dryer

The one dryer that tells you what each heat setting actually is in degrees, which makes it the only one in the category you can plan a routine around.

Published specifications for the Dyson Supersonic Origin Hair Dryer, each linked to its source

Power	1,600W at full powersource
Heat settings	4 settings — 212F (100C), 176F (80C), 140F (60C), and constant coldsource
Speed settings	3 — fast drying, regular drying, gentle dryingsource
Airflow	Up to 41 liters per secondsource
Heat regulation	Measures air temperature over 40 times a secondsource
Dimensions	9.6 in long, 3.9 in wide, 3.1 in deepsource

What those numbers mean

Four heat settings published as 212F, 176F and 140F plus cold is the disclosure the rest of the category refuses to make. It means you can pick a setting against a damage threshold instead of against a vague label.

Note where those numbers sit. Even the hottest setting, 212F, is below the 302F figure Shark names as its damage line and far below the temperatures at which the literature reports cuticle degradation.

1,600W is less nominal power than a US 1,875W dryer, and 41 l/s of airflow is how it compensates. Again: air speed, not temperature.

What it does well

• Publishes an actual temperature for every heat setting, uniquely in this category
• Airflow figure published in liters per second
• Top setting of 212F is below every damage threshold in the cited research
• Attachments attach magnetically and can be changed mid-dry

What it does not

• Costs several times what a competent 1,875W dryer costs
• 1,600W nominal will feel slower than an AC dryer on very thick hair
• Dyson does not sell through every retailer, so availability moves around

Skip this one if: Skip it if the budget is the constraint rather than the information. Everything the Supersonic does for hair health can be approximated by running a cheaper dryer on medium heat and high speed, which costs nothing.

$399.99 · View on Amazon

#ad · how this is funded · price as of October 23, 2026

#2 · A published temperature ceiling you can actually check

Shark SpeedStyle Pro Ionic Dryer (HD732)

The rare dryer that publishes the numbers that matter: every heat setting in degrees, plus a ceiling it says it never exceeds at 230F, which is below every damage threshold in the literature.

Published specifications for the Shark SpeedStyle Pro Ionic Dryer (HD732), each linked to its source

Heat settings	Three published settings — low 65C, medium 80C, high 100C — plus a cool shot and a permanent cool modesource
Temperature ceiling	Measures and regulates temperature 1,000 times a second, never exceeding 230F, and never approaching 302Fsource
Power	1,600 watts at 120 voltssource
Weight	1.674 lbsource
Noise	About 83 decibelssource
Cord	Approximately 8 ftsource
Scalp Shield mode	Reduces air temperature to a level Shark states is optimized for scalp comfort and root drying, developed with dermatologistssource
Attachments	Three accessories per dryer, chosen from the DefrizzFast diffuser, QuickSmooth brush, Express Touchup brush, Lift & Stretch wide-tooth comb, Turbo concentrator and FrizzFighter finishing toolsource

What those numbers mean

A stated ceiling of 230F is the single most useful specification on any dryer, and almost nobody publishes one. It puts the airflow well under the 302F figure Shark itself names as the damage line and far under the cuticle-degradation range in the research.

Shark also names each setting in degrees — 65C, 80C and 100C — which is disclosure the rest of the category mostly refuses. It means you can pick a setting against a damage threshold rather than against an unlabeled dial, and note that even the top setting lands under that 230F ceiling.

The accessory list is a choice rather than a fixed bundle, which matters more than it sounds. The DefrizzFast diffuser is the attachment that earns this dryer its place on curly and coily pages, so check it is one of the three in the configuration you buy.

What it does well

• Publishes a temperature ceiling AND every heat setting in degrees
• Published wattage, weight, cord length and even a decibel figure
• Regulates 1,000 times a second, the same control loop as the FlexStyle
• Scalp Shield mode is aimed squarely at root drying on fragile new growth

What it does not

• Shark publishes no airflow figure, so drying speed cannot be checked on paper
• 1,600W is less power than an 1,875W AC dryer, and the low ceiling compounds that
• Three accessories is a choice, so the diffuser is not guaranteed to be in the box
• The retail listing says 1,750W where Shark's own support article says 1,600W

Skip this one if: Skip it if you want maximum heat for a fast, poker-straight blowout on coarse hair. The ceiling that protects fragile hair is the same ceiling that will frustrate you here.

$225.00 · View on Amazon

#ad · how this is funded · price as of October 23, 2026

Every published specification

Airflow published in liters per second is the second unusual disclosure here. It is the figure that explains how a 1,600W dryer competes with 1,875W ones: it dries by moving a large volume of air rather than by heating a smaller volume more.

What 212F means against the research

Published research on thermally treated hair reports cuticle degradation beginning around 150C (302F) and cortex damage from around 200C (392F). The Supersonic's hottest setting is 212F — a hundred degrees below the first threshold.

That reframes the usual concern about blow drying. Whatever damage a Supersonic does is not thermal denaturation of keratin; it is the mechanical effect of air on the cuticle, which is addressed by lower speeds and better technique rather than by lower heat. The heat damage guide covers the difference.

The running-cost arithmetic

What the specs do not cover

• Which attachments are in the box. This varies by configuration, and some bundles include a diffuser while others do not. Check before buying if you have curls.
• Durability. No manufacturer publishes a lifespan and we are not going to estimate one.
• Noise. Dyson does not publish a decibel figure for the Supersonic, though Laifen does for the Swift.
• Whether it feels worth it. That is a judgment about money, and the spec sheet cannot settle it.

Who should skip it

Skip it if budget is the constraint rather than the information. Everything the Supersonic does for hair health can be approximated by running a cheaper dryer on medium heat and high speed, and the alternatives are scored here on which of its published specs each one actually replaces. That costs nothing, and the Shark SpeedStyle publishes a 230F ceiling for considerably less.

Skip it if you have very thick hair and want the fastest possible dry. 1,600W is real but it is below the 1,875W and 2,000W tools on the thick hair page, and airflow only partly compensates on genuinely dense hair.

The verdict

The Supersonic is the best-documented dryer in the category and the disclosure is not a marketing exercise — it lets you style against a threshold rather than against a guess. Whether that documentation and the engineering behind it justify the price against a Shark that also publishes a ceiling is a money question, and we will not pretend the specification sheet answers it for you.