Shark FlexStyle IonCurl: what to know before you buy
What Shark says about the FlexStyle IonCurl (HD840), what is in the box, and how it compares with the original FlexStyle and other hot-air stylers.
Short answerShark FlexStyle IonCurl (model HD840) is the curl-focused addition to Shark's FlexStyle hot-air range, and Shark says it wraps curls more tightly, adds ion-boosted frizz control and includes a shine-finishing attachment. Shark's curl claim is measured against its own original FlexStyle and its faster-drying claim against the Dyson Airwrap i.d. using third-party testing the company cites, so treat the comparisons as brand claims. If you do not need the extra curl wrap, the original FlexStyle is the like-for-like alternative in Shark's range.
Compare the 5 picks
| Pick | Who it suits | Amazon |
|---|---|---|
| Shark FlexStyle IonCurl 5-in-1 Hair Styler, Curler & Dryer (HD840) | Someone who wants Shark's curl-focused FlexStyle and will use the auto-wrap curlers more than the straight-blowout tools. | Check price on Amazon |
| Shark FlexStyle Air Styling & Drying System | Someone comparing within Shark's range who wants the original twist-between-dryer-and-styler design. | Check price on Amazon |
| Dyson Airwrap i.d. Multi-Styler | Someone weighing IonCurl against the multi-styler Shark itself names in its drying-speed claim. | Check price on Amazon |
| Shark SpeedStyle Pro Flex Hair Dryer (HD542) | Someone who only needs a fast dryer with a diffuser and does not want styling attachments. | Check price on Amazon |
| REVLON One-Step Volumizer Plus | Someone who wants a hot-air brush for blowouts and soft curls instead of a multi-styler. | Check price on Amazon |
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On this page
What Shark says is new in IonCurl
- Release: Shark's news release, dated July 6, 2026, calls FlexStyle IonCurl the newest addition to its FlexStyle franchise and says it was available from that date on sharkninja.com.
- Curl wrap: Shark describes CoandaBoost Technology as enhanced airflow that wraps hair tighter around the barrel for more defined, bouncier curls. The footnote says the comparison is against the original FlexStyle.
- Frizz and shine: Shark says 200 million negative ions help reduce static and frizz as you style, and that the FrizzFighter High-Shine Polisher attachment gives up to 24 hours of shine, measured against detangled air-dried hair.
- Drying speed: Shark says boosted airflow dries hair faster than the Dyson Airwrap i.d., citing third-party testing with human hair using the Fast Dryer attachment. It also calls IonCurl the most powerful multi-styler compared with the hot air styler market.
- Heat: Shark says Heat Sense monitoring checks temperature 1,000 times per second and caps it at 302°F.
What is in the box, and what is extra
- Shark's product page for model HD840 lists a weight of 1.5 lbs, a 7.9 ft cord, 120 volts, 1,700 watts and a two-year limited warranty.
- In the box, per Shark: the dryer and multi-styler, two 1.25 inch Auto-Wrap Coanda Curlers, the FrizzFighter High Shine Polisher, a Styling Concentrator and an Oval Brush.
- Sold separately on Shark's page: 0.95 inch Coanda Curlers, a Round Brush, a Paddle Brush, a Curl-Defining Diffuser, a Wide Tooth Comb and storage cases. If you plan to diffuse curls, note that the diffuser is not in the box list.
How to weigh it against what homewise already covers
- Original FlexStyle: Shark's own comparison chart sets IonCurl against the original, and its bouncier-curls claim is relative to that model only, so it says nothing about how IonCurl compares with other brands.
- Dyson Airwrap i.d.: Amazon's listing describes a Bluetooth-connected styler that builds a styling profile from six questions about hair type and length. Shark's drying-speed claim names this tool.
- Dryer only: if you mainly need a fast dryer with a diffuser, a dedicated dryer such as Shark's SpeedStyle Pro Flex does that without the curling attachments.
IonCurl and the alternatives
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Shark FlexStyle IonCurl 5-in-1 Hair Styler, Curler & Dryer (HD840)
Who it suits: Someone who wants Shark's curl-focused FlexStyle and will use the auto-wrap curlers more than the straight-blowout tools.
Shark's page and release attribute bouncier, more defined curls to CoandaBoost and ion-powered frizz control to the new Ion Smooth feature, all against the original FlexStyle. Amazon's listing says it comes with four attachments and no heat damage, which is Shark's wording.
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Shark FlexStyle Air Styling & Drying System
Who it suits: Someone comparing within Shark's range who wants the original twist-between-dryer-and-styler design.
Shark's comparison chart sets IonCurl against the Shark FlexStyle Air Styling & Drying System, which is the product on this listing. Amazon's listing describes a dryer that twists into a multi-styler with Coanda auto-wrap curling, 4 heat and 3 airflow settings and a cool shot. homewise has a separate review of it.
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Dyson Airwrap i.d. Multi-Styler
Who it suits: Someone weighing IonCurl against the multi-styler Shark itself names in its drying-speed claim.
Amazon's listing calls it a 6-in-1 styler that dries, curls, waves, shapes and smooths, connects by Bluetooth to the MyDyson app and is engineered for straight and wavy hair. Dyson sells a Curly+Coily kit under a separate listing, and the two kits differ in contents.
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Shark SpeedStyle Pro Flex Hair Dryer (HD542)
Who it suits: Someone who only needs a fast dryer with a diffuser and does not want styling attachments.
Amazon's listing describes a foldable high-velocity dryer with a Turbo Concentrator and diffuser included and airflow that reaches 0 to 100 mph in under a second. homewise's curly-hair dryer roundup picks it as its best-value dryer.
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REVLON One-Step Volumizer Plus
Who it suits: Someone who wants a hot-air brush for blowouts and soft curls instead of a multi-styler.
Amazon's listing calls it a dryer and styler with a 2.4 inch oval barrel for chin-length to mid-length hair, six heat settings and a detachable brush head. It is a different kind of tool from IonCurl: the listing mentions no auto-wrap curling barrels.
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Frequently asked questions
Is the Shark FlexStyle IonCurl different from the original FlexStyle?
Yes. Shark describes IonCurl as the curl-focused model, adding CoandaBoost for tighter curl wrapping and Ion Smooth for static and frizz. Its bouncier, more defined curls claim is measured against the original FlexStyle, so it shows a gain over that model, not over other brands.
Does the Shark IonCurl dry hair faster than the Dyson Airwrap i.d.?
Shark says it does, citing third-party testing with human hair that used the Fast Dryer attachment. The product page gives only a footnote about that testing, and we did not test either tool, so treat it as a manufacturer claim until you see the underlying results.
What comes in the box with the Shark FlexStyle IonCurl?
Shark's product page lists the dryer and multi-styler, two 1.25 inch Auto-Wrap Coanda Curlers, the FrizzFighter High Shine Polisher, a Styling Concentrator and an Oval Brush. Other attachments, including a diffuser, are listed as separate add-ons.
Does the Shark FlexStyle IonCurl come with a diffuser?
Not according to Shark's box list for model HD840. The page sells a Curl-Defining Diffuser as an add-on, along with a Round Brush, Paddle Brush, Wide Tooth Comb and 0.95 inch Coanda Curlers, so check the listing contents before you order.
How we chose
This page is desk research. It draws on Shark's own product page for the FlexStyle IonCurl (HD840), Shark Beauty's July 6, 2026 news release on its investor site, and Amazon's product listings, and it attributes every claim to the brand or to the Amazon listing text. We did not test any of these products, and wear time, hold and results vary by person.
Listings, sellers and sizes change quickly. At time of writing (October 29, 2026), every "Check price on Amazon" button on this page went to an exact Amazon listing for the product named, new and in stock. homewise is not affiliated with the brands named here. Confirm the exact name, size, shade and seller on the listing before you buy.