#F66437
Closest named color: Tomato (#FF6347). oklch(68.2% 0.189 37.3), rgb(246, 100, 55).
Aa
Black text reads best on this color (6.79:1).
About this color
#F66437 is a medium-light, vivid red. In OKLCH its lightness is 68%, its chroma 0.189 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Tomato (#FF6347), ΔE 0.023 away. Black text reads best on it, at 6.79:1.
| Hue family | Reds |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.189) |
| Temperature | warm |
| Nearest name | Tomato (#FF6347) |
| Black text | 6.79:1 |
| White text | 3.08:1 |
Values
| HEX | #F66437 |
| RGB | rgb(246, 100, 55) |
| HSL | hsl(14, 91%, 59%) |
| OKLCH | oklch(68.2% 0.189 37.3) |
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 #F66437 | 3.08:1 | AA large text | Lc -62.3 | Content text, not long reading |
| Black text on #F66437 | 6.79:1 | AA | Lc 47.1 | Large or bold text, headings |
| #F66437 text on white | 3.08:1 | AA large text | Lc 57.0 | Large or bold text, headings |
| #F66437 text on black | 6.79:1 | AA | Lc -44.8 | 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 400.
-
Step 50
50
#FFF2EF
oklch(97.1% 0.015 33.1)
-
Step 100
100
#FFE3DA
oklch(93.6% 0.033 38.6)
-
Step 200
200
#FFCCBC
oklch(88.6% 0.062 38.1)
-
Step 300
300
#FFA78D
oklch(80.9% 0.111 37.2)
-
Step 400
400 (this color)
#F66437
oklch(68.2% 0.189 37.3)
-
Step 500
500
#EC4800
oklch(63.1% 0.21 37.3)
-
Step 600
600
#C73B00
oklch(55.5% 0.185 37.2)
-
Step 700
700
#A93100
oklch(49.2% 0.163 37.3)
-
Step 800
800
#8B2700
oklch(42.7% 0.141 37.5)
-
Step 900
900
#751F00
oklch(37.6% 0.125 37.3)
-
Step 950
950
#491000
oklch(27.1% 0.09 37.4)
#F66437 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) | #8D7E31 | 0.189 |
| Deuteranopia (no green cones) | #B19F32 | 0.173 |
| Tritanopia (no blue cones) | #FF405B | 0.078 |
| Achromatopsia (no color) | #939393 | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #F66437
#F66437
oklch(68.2% 0.189 37.3)
- #00AACA
#00AACA
oklch(68.1% 0.122 217.6)
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 #F66437, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Tomato #FF6347 ΔE 0.023
- Bright Orange #FF5B00 ΔE 0.026
- Orange Pant #FB5607 ΔE 0.027
- Burnt Sienna #E76F51 ΔE 0.034
- Orange Pink #FF6F52 ΔE 0.034
- Pinkish Orange #FF724C ΔE 0.035
- Blood Orange #FE4B03 ΔE 0.039
- Grapefruit #FD5956 ΔE 0.043
Use #F66437 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.