#EC643B
Closest named color: Burnt Sienna (#E76F51). oklch(66.7% 0.178 37.2), rgb(236, 100, 59).
Aa
Black text reads best on this color (6.45:1).
About this color
#EC643B is a medium-light, vivid red. In OKLCH its lightness is 67%, its chroma 0.178 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Burnt Sienna (#E76F51), ΔE 0.025 away. Black text reads best on it, at 6.45:1.
| Hue family | Reds |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.178) |
| Temperature | warm |
| Nearest name | Burnt Sienna (#E76F51) |
| Black text | 6.45:1 |
| White text | 3.25:1 |
Values
| HEX | #EC643B |
| RGB | rgb(236, 100, 59) |
| HSL | hsl(14, 82%, 58%) |
| OKLCH | oklch(66.7% 0.178 37.2) |
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 #EC643B | 3.25:1 | AA large text | Lc -64.5 | Content text, not long reading |
| Black text on #EC643B | 6.45:1 | AA | Lc 45.0 | Large or bold text, headings |
| #EC643B text on white | 3.25:1 | AA large text | Lc 59.1 | Large or bold text, headings |
| #EC643B text on black | 6.45:1 | AA | Lc -42.7 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#FAE5DE
oklch(93.7% 0.025 39.4)
-
Step 200
200
#F7CFC3
oklch(88.5% 0.048 37.3)
-
Step 300
300
#F3AD99
oklch(80.9% 0.088 36.6)
-
Step 400
400
#E97F5F
oklch(70.8% 0.139 37.6)
-
Step 500
500 (this color)
#EC643B
oklch(66.7% 0.178 37.2)
-
Step 600
600
#C83B00
oklch(55.7% 0.186 37.1)
-
Step 700
700
#A93000
oklch(49.1% 0.164 37)
-
Step 800
800
#8C2600
oklch(42.7% 0.143 37)
-
Step 900
900
#72240A
oklch(37.8% 0.115 37.3)
-
Step 950
950
#431609
oklch(26.9% 0.073 36.7)
#EC643B 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) | #8A7C36 | 0.176 |
| Deuteranopia (no green cones) | #AB9A37 | 0.162 |
| Tritanopia (no blue cones) | #FF455B | 0.075 |
| Achromatopsia (no color) | #8F8F8F | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EC643B
#EC643B
oklch(66.7% 0.178 37.2)
- #00A6C4
#00A6C4
oklch(66.9% 0.119 216.8)
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 #EC643B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Sienna #E76F51 ΔE 0.025
- Orange Pant #FB5607 ΔE 0.036
- Tomato #FF6347 ΔE 0.037
- Bright Orange #FF5B00 ΔE 0.040
- Blood Orange #FE4B03 ΔE 0.047
- Orange Pink #FF6F52 ΔE 0.047
- Grapefruit #FD5956 ΔE 0.049
- Pinkish Orange #FF724C ΔE 0.049
Use #EC643B 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.