#F43F04
Closest named color: Vermillion (#F4320C). oklch(63.6% 0.223 34.7), rgb(244, 63, 4).
Aa
Black text reads best on this color (5.55:1).
About this color
#F43F04 is a medium-light, vivid red. In OKLCH its lightness is 64%, its chroma 0.223 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Vermillion (#F4320C), ΔE 0.016 away. Black text reads best on it, at 5.55:1.
| Hue family | Reds |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.223) |
| Temperature | warm |
| Nearest name | Vermillion (#F4320C) |
| Black text | 5.55:1 |
| White text | 3.77:1 |
Values
| HEX | #F43F04 |
| RGB | rgb(244, 63, 4) |
| HSL | hsl(15, 97%, 49%) |
| OKLCH | oklch(63.6% 0.223 34.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #F43F04 | 3.77:1 | AA large text | Lc -69.2 | Content text, not long reading |
| Black text on #F43F04 | 5.55:1 | AA | Lc 40.4 | Non-text elements, placeholder text |
| #F43F04 text on white | 3.77:1 | AA large text | Lc 63.7 | Content text, not long reading |
| #F43F04 text on black | 5.55:1 | AA | Lc -38.0 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#FFF2EF
oklch(97.1% 0.015 33.1)
-
Step 100
100
#FEE3DC
oklch(93.6% 0.031 34.9)
-
Step 200
200
#FECCBF
oklch(88.5% 0.06 35)
-
Step 300
300
#FFA791
oklch(81% 0.109 34.7)
-
Step 400
400
#FA7150
oklch(70.8% 0.175 34.8)
-
Step 500
500 (this color)
#F43F04
oklch(63.6% 0.223 34.7)
-
Step 600
600
#CC3200
oklch(55.5% 0.196 34.7)
-
Step 700
700
#AD2900
oklch(49.1% 0.173 34.7)
-
Step 800
800
#8F2000
oklch(42.7% 0.151 34.7)
-
Step 900
900
#781900
oklch(37.6% 0.133 34.6)
-
Step 950
950
#4A0E01
oklch(27.1% 0.093 35.1)
#F43F04 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #796A00 | 0.232 |
| Deuteranopia (no green cones) | #A59200 | 0.209 |
| Tritanopia (no blue cones) | #FF0038 | 0.059 |
| Achromatopsia (no color) | #838383 | 0.225 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #F43F04
#F43F04
oklch(63.6% 0.223 34.7)
- #009CB5
#009CB5
oklch(63.7% 0.112 214.4)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #F43F04, closest first.
No curated palette has a color within ΔE 0.04 of #F43F04.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vermillion #F4320C ΔE 0.016
- Red Orange #FD3C06 ΔE 0.017
- Orangey Red #FA4224 ΔE 0.018
- Orangered #FE420F ΔE 0.021
- Orange Red #FF4500 ΔE 0.025
- Blood Orange #FE4B03 ΔE 0.029
- Tomato Red #EC2D01 ΔE 0.030
- Orange Pant #FB5607 ΔE 0.040
Use #F43F04 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.