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Hot air brush vs straightener: which is better for you

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Short answer

A hot air brush dries and styles damp hair in one step, giving a smooth blowout with volume and bend at the ends. A straightener (flat iron) works only on dry hair, pressing it between hot plates for a flatter, sleeker finish. Choose a hot air brush if you want to skip a separate dryer and like body; choose a straightener for poker-straight hair or quick touch-ups on dry hair.

Facts are taken from each Amazon listing. Prices are checked daily and shown with their date.

Verdict

Buy a hot air brush such as the Drybar Double Shot or ghd Duet Blowdry if you want to dry and style in one step with volume. Use a straightener for the flattest, sleekest finish on dry hair, or the ghd Duet Style if you want to dry and straighten from damp hair with one tool.

Hot air brushes and straighteners both smooth hair, but they work at different stages and give different results. This page is for anyone deciding which tool to buy for a smoother everyday style. We explain how each works, what finish to expect, and how long each takes. We also cover a hybrid: 2-in-1 hot air stylers that dry and straighten with plates. Product facts come only from the Amazon listings of the ghd Duet Blowdry, the Drybar Double Shot and the ghd Duet Style. For basics, see what is a hot air brush.

How each tool works

A hot air brush combines a dryer and a round or oval brush. Warm air comes out through vents in the barrel while the bristles grip and tension the hair. You use it on towel-dried or rough-dried hair and work section by section from roots to ends. The Drybar Double Shot listing describes exactly this: the hot air of a blow-dryer with the structure of a round brush for a smooth blowout with volume in one step.

A straightener or flat iron has two heated plates that clamp around a section of dry hair. You glide it from root to tip and the heat and pressure flatten the strand. It is not designed to dry hair. Using a flat iron on wet hair is a common warning in maker instructions because water in the hair turns to steam under the plates.

  • 1 inShort hair, tight curls at the ends
  • 1.2 in / 30 mmShort to medium hair, defined curls
  • 1.5 inMedium hair, smooth ends with some bend
  • 1.6 in / 40 mmMedium to long hair, loose waves
  • 2 in ovalLong hair, smooth blowout with volume
Common hot air brush and barrel diameters, drawn to the same scale. Smaller sizes give tighter curls and more lift.

Finish, time and heat compared

Time depends on hair length and thickness. A hot air brush saves the separate drying step, but on thick or long hair it is usually faster to rough dry with a dryer first, then finish with the brush. A straightener only makes sense once hair is already dry, so your total time includes drying.

  • Starts on

    Hot air brush
    Damp or towel-dried hair
    Straightener (flat iron)
    Fully dry hair

  • Finish

    Hot air brush
    Smooth with volume and soft bend
    Straightener (flat iron)
    Flat, sleek, very straight

  • Replaces a dryer

    Hot air brush
    Yes, dries while styling
    Straightener (flat iron)
    No

  • Heat source

    Hot air brush
    Heated airflow
    Straightener (flat iron)
    Heated plates in contact with hair

  • Good for

    Hot air brush
    Blowouts, volume, everyday smoothing
    Straightener (flat iron)
    Sleek looks, frizz touch-ups, second-day hair

  • Learning curve

    Hot air brush
    Low, like a round brush
    Straightener (flat iron)
    Low, but needs care near the scalp
General differences between the tool types

Products compared

Prices are Amazon listing prices at the time of writing. The ghd Duet Blowdry listing describes Heat-Air Xchange technology that dries at a consistent low temperature of 248 F, snag-free heated bristles and an elliptical barrel. The Drybar Double Shot is a simpler 2.4 in oval brush built for volume; larger oval barrels generally suit medium to long hair. The ghd Duet Style is the hybrid: its listing says it dries and straightens at the same time, from wet to styled, and has a Shine Shot mode that works on dry hair only, heating to 365 F with no air.

  • ghd Duet Blowdry

    Type
    2-in-1 blow dryer brush
    Listed heat
    Consistent 248 F
    Key listing features
    Designed for wet hair, elliptical barrel, heated bristles, 30-min auto sleep, 2-year warranty
    Listed price
    $321.99

  • Drybar The Double Shot

    Type
    Oval blow-dryer brush, 2.4 in
    Listed heat
    Not stated
    Key listing features
    Ionic technology, vents for airflow, lightweight
    Listed price
    $155.00

  • ghd Duet Style

    Type
    2-in-1 hot air styler with plates
    Listed heat
    365 F in Shine Shot mode (dry hair only)
    Key listing features
    Dries and straightens at once, floating plates, root drying vents
    Listed price
    $210.00
From the Amazon listings for each model

Which one suits your hair

Fine or flat hair: a hot air brush usually suits better because it adds root lift. A straightener can make fine hair look flatter.

Thick or frizzy hair: a straightener gives the sleekest result on dry hair. A hot air brush works well after a rough dry, and the ghd Duet Style combines both if you want straight results from damp hair.

Curly or coily hair: an oval hot air brush can stretch curls into a blowout; a straightener can then smooth the ends. Use the lowest heat that works and a heat protectant.

Short hair: pick a smaller brush barrel; see hot air brush on short hair and the hot air brush size guide.

Note.Always use a heat protectant, keep the tool moving, and never use a flat iron on wet hair unless the maker says it is designed for it, as the ghd Duet Style is.

Can one tool replace the other

A hot air brush can replace a dryer and a round brush for most everyday blowouts. It does not get hair as flat as a straightener. A straightener cannot replace a dryer. If you want both drying and a straight finish from one tool, a 2-in-1 hot air styler with plates, like the ghd Duet Style, sits between the two.

If you want curls as well as smoothing, a multi-styler may suit better; compare Dyson Airwrap vs Supersonic and blow dryer brush vs blow dryer. Our best blow dryer brush guide lists every hot air brush we cover, and best ghd hair dryer includes both ghd Duet tools.

Compare hot air brushes →

Frequently asked questions

Is a hot air brush less damaging than a straightener? It depends on temperature and use. Hot air brushes heat with air rather than direct plate contact, and the ghd Duet Blowdry lists a consistent 248 F. Lower heat and fewer passes are kinder to hair with either tool.

Can a hot air brush straighten hair? It gives a smooth blowout, but not the flat finish of a flat iron. A paddle or oval head gets closest.

Can I use a hot air brush on wet hair? Many are designed for damp hair; towel-dry first. See hot air brush on wet hair.

Which is faster in the morning? A hot air brush if you start with damp hair. A straightener if your hair is already dry and only needs smoothing.

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