# Best Bio Ionic flat irons and curling irons compared Source: https://plateandwand.com/best/best-bio-ionic-styling-iron Publisher: Plate & Wand. Picks are chosen from what each Amazon listing states, not from hands-on tests. Method: https://plateandwand.com/how-we-pick Bio Ionic sells two flat iron lines and two curling lines, and the names do not make the differences obvious. The OnePass irons use silicone speed strips that grip hair as it passes, in 1 inch and 1.5 inch widths. The 10X iron uses sonic vibrating 1 inch plates and a rounded-tip design for the hairline. On the curling side, the Long Barrel iron comes in several barrel sizes, each 2 inches longer than a standard iron, and the Twist set gives you three swappable barrels on one base. Every listing here caps heat at 430°F or 450°F with adjustable settings. This guide compares seven Bio Ionic tools over $150 by type, plate or barrel size, top temperature, heat settings, auto shut-off and voltage, from the Amazon listings. Missing details are marked Not stated. ## Picks ### 1. Bio Ionic 10X Styling Iron, 1" Hair Straightener with Moisturizing Heat Technology, Flat Iron for 10-Minute Styling, Hair Straightener and Curler, Soft Amethyst Plate width: 1 in; Curl design: Rounded barrel, rounded-tip plates; Temperature: Up to 450°F; Heat settings: Variable, count not stated; Voltage: Not stated Bio Ionic's 10X flat iron with sonic vibrating 1 inch ceramic plates, a rounded barrel and a rounded-tip plate for the hairline. It straightens and waves. What the listing offers: - Sonic vibrating 1 inch plates increase surface contact, according to the listing. - The rounded barrel and rounded-tip plates help with waves and short hairs at the hairline. - Variable heat to 450°F, a 1-hour auto shut-off and a 9 ft swivel cord are listed. Limits to know: - The count of heat settings and voltage are not stated. - At $239 it costs more than the OnePass 1 inch for the same plate width. ### 2. Bio Ionic OnePass Styling Flat Iron 1.5-Inch Black | Moisturizing Heat Hair Straightener with Silicone Speed Strips, Digital Temperature Control to 450°F, Auto Shut-Off, Shine-Boosting Plates Plate width: 1.5 in; Max temperature: 450°F; Heat settings: Digital control (count not stated); Voltage: Not stated; Cord: Not stated The wider OnePass flat iron with 1.5 inch ceramic plates, silicone speed strips and digital heat to 450°F. It suits longer or thicker hair that benefits from a broader plate. What the listing offers: - Silicone speed strips grip hair and guide it from root to tip, according to the listing. - A 1.5 inch styling surface covers larger sections than the 1 inch OnePass. - Digital temperature control up to 450°F and a 1-hour auto shut-off are listed. Limits to know: - The number of heat steps, voltage and cord length are not stated. - Same $217 price as the 1 inch version, so pick by plate width only. ### 3. Bio Ionic Long Barrel Curling Iron, Moisture Heat Technology & NanoIonic MX Barrel size: 1.25 in, 2 in longer than standard; Barrel build: Not stated; Max temperature: 430°F; Heat settings: Variable (count not stated); Voltage: Not stated The 1.25 inch Long Barrel curling iron for large soft curls and waves, with a barrel 2 inches longer than standard. It is the all-round size in the Long Barrel line. What the listing offers: - The listing states the 1.25 inch barrel makes large soft curls and waves. - A barrel 2 inches longer than standard helps with long hair and back sections. - Variable heat up to 430°F, a 1-hour auto shut-off and a cool touch grip are listed. Limits to know: - Heat step count, voltage and clamp style are not stated. - Its top heat of 430°F is lower than the 450°F of the Bio Ionic flat irons. ### 4. Bio Ionic Twist 3-in-1 Interchangeable Curling Iron & Wand Set, 1 Handle with 3 Swappable Ceramic Barrels (0.5" Wand, 1" Tapered, 1.25" Clip), Ionic, Dual Voltage, All Hair Types Barrel size: 0.5 in. wand, 1 in. tapered, 1.25 in. clip; Barrel shape: Straight wand, tapered wand, clip barrel; Temperature: 6 settings up to 430°F; Glove included: Yes; Voltage: 110V-240V One base with three swappable ceramic barrels, six heat settings to 430°F and dual voltage. It suits people who change curl size often or travel. What the listing offers: - The listing includes a 0.5 inch wand, a 1 inch tapered wand and a 1.25 inch clip barrel. - Six heat settings to 430°F with a digital LED display, temperature lock and memory are listed. - Universal 110V-240V voltage, glove, cool tip, 9 ft swivel cord and 1-year limited warranty are listed. Limits to know: - The listing does not say how long before auto shut-off engages. - None of the Twist barrels is described as long, unlike the Long Barrel line. ### 5. Bio Ionic OnePass Styling Flat Iron 1-Inch Black | Moisturizing Heat Hair Straightener with Silicone Speed Strips, Digital Temperature Control to 450°F, Auto Shut-Off, Shine-Boosting Plates Plate width: 1 in; Heat settings: Digital, count not stated; Max temperature: 450°F; Lowest setting: Not stated; Voltage: Not stated The 1 inch OnePass flat iron with silicone speed strips and digital heat to 450°F. It suits shorter or medium hair and quick touch-ups. What the listing offers: - Silicone speed strips grip and guide hair evenly from root to tip, per the listing. - Digital temperature control goes up to 450°F, with lower settings for touch-ups. - A built-in 1-hour auto shut-off is listed. Limits to know: - Heat step count, voltage and cord length are not stated. - It lacks the rounded-tip plates the 10X lists for hairline work. ### 6. Bio Ionic Long Barrel Curling Iron, Moisture Heat Technology & NanoIonic MX Barrel size: 1.5 in; Barrel length: 2 in longer than standard; Max temperature: 430°F; Heat settings: Variable (count not stated); Clamp: Not stated The largest Long Barrel size at 1.5 inches, for voluminous lived-in curls. It suits long hair where loose body matters more than a defined curl. What the listing offers: - The listing states the 1.5 inch barrel creates voluminous lived-in curls. - A barrel 2 inches longer than standard helps with long hair, per the listing. - Variable heat up to 430°F and a 1-hour auto shut-off are listed. Limits to know: - Heat step count, voltage and clamp style are not stated. - A 1.5 inch barrel gives looser curls that may not suit short hair. ### 7. Bio Ionic Long Barrel Curling Iron, Moisture Heat Technology & NanoIonic MX Barrel size: 0.75 in.; Clip or wand: Clip (curling iron); Heat settings: Variable (count not stated); Max temperature: 430°F; Voltage: Not stated The smallest Long Barrel size at 0.75 inch, for small tight curls and spirals. It suits anyone after defined ringlets rather than waves. What the listing offers: - The listing states the 0.75 inch barrel creates small tight curls and spirals. - A barrel 2 inches longer than standard gives reach on long hair, per the listing. - Variable heat to 430°F, a 1-hour auto shut-off and a cool touch grip are listed. Limits to know: - A thin barrel means more sections and more time on thick or long hair. - Heat step count, voltage and clamp style are not stated. As an Amazon Associate I earn from qualifying purchases.