#F43633
Closest named color: Vermillion (#F4320C). oklch(63.2% 0.225 27.2), rgb(244, 54, 51).
Aa
Black text reads best on this color (5.42:1).
About this color
#F43633 is a medium-light, vivid red. In OKLCH its lightness is 63%, its chroma 0.225 and its hue 27°. Its hue sits on the warm side of the wheel. The nearest named color is Vermillion (#F4320C), ΔE 0.021 away. Black text reads best on it, at 5.42:1.
| Hue family | Reds |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.225) |
| Temperature | warm |
| Nearest name | Vermillion (#F4320C) |
| Black text | 5.42:1 |
| White text | 3.87:1 |
Values
| HEX | #F43633 |
| RGB | rgb(244, 54, 51) |
| HSL | hsl(1, 90%, 58%) |
| OKLCH | oklch(63.2% 0.225 27.2) |
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 #F43633 | 3.87:1 | AA large text | Lc -70.0 | Content text, not long reading |
| Black text on #F43633 | 5.42:1 | AA | Lc 39.6 | Non-text elements, placeholder text |
| #F43633 text on white | 3.87:1 | AA large text | Lc 64.5 | Content text, not long reading |
| #F43633 text on black | 5.42:1 | AA | Lc -37.2 | 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
#FFF2F0
oklch(97.1% 0.014 28)
-
Step 100
100
#FFE2DE
oklch(93.5% 0.033 27.1)
-
Step 200
200
#FFCBC4
oklch(88.6% 0.06 27.2)
-
Step 300
300
#FFA59A
oklch(80.9% 0.109 27.3)
-
Step 400
400
#FB6D61
oklch(70.7% 0.176 27.3)
-
Step 500
500 (this color)
#F43633
oklch(63.2% 0.225 27.2)
-
Step 600
600
#D90016
oklch(55.7% 0.227 27.2)
-
Step 700
700
#B70011
oklch(49% 0.2 27.1)
-
Step 800
800
#98000C
oklch(42.7% 0.174 27.2)
-
Step 900
900
#7E090D
oklch(37.8% 0.147 27.2)
-
Step 950
950
#4A0C0A
oklch(27% 0.092 27.4)
#F43633 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) | #726730 | 0.244 |
| Deuteranopia (no green cones) | #A1902A | 0.221 |
| Tritanopia (no blue cones) | #FF0038 | 0.035 |
| Achromatopsia (no color) | #818181 | 0.227 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #F43633
#F43633
oklch(63.2% 0.225 27.2)
- #009CAB
#009CAB
oklch(63.3% 0.108 206.8)
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 #F43633, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vermillion #F4320C ΔE 0.021
- Strawberry #FB2943 ΔE 0.025
- Orangey Red #FA4224 ΔE 0.026
- Red Pantone #EF233C ΔE 0.027
- Cherry Red #F7022A ΔE 0.030
- Pinky Red #FC2647 ΔE 0.031
- Tomato Red #EC2D01 ΔE 0.031
- Imperial Red #E63946 ΔE 0.032
Use #F43633 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.