#EF6543
Closest named color: Burnt Sienna (#E76F51). oklch(67.4% 0.178 35), rgb(239, 101, 67).
Aa
Black text reads best on this color (6.61:1).
About this color
#EF6543 is a medium-light, vivid red. In OKLCH its lightness is 67%, its chroma 0.178 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Burnt Sienna (#E76F51), ΔE 0.022 away. Black text reads best on it, at 6.61:1.
| Hue family | Reds |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.178) |
| Temperature | warm |
| Nearest name | Burnt Sienna (#E76F51) |
| Black text | 6.61:1 |
| White text | 3.17:1 |
Values
| HEX | #EF6543 |
| RGB | rgb(239, 101, 67) |
| HSL | hsl(12, 84%, 60%) |
| OKLCH | oklch(67.4% 0.178 35) |
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 #EF6543 | 3.17:1 | AA large text | Lc -63.5 | Content text, not long reading |
| Black text on #EF6543 | 6.61:1 | AA | Lc 45.9 | Large or bold text, headings |
| #EF6543 text on white | 3.17:1 | AA large text | Lc 58.1 | Large or bold text, headings |
| #EF6543 text on black | 6.61:1 | AA | Lc -43.6 | 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
#FEE3DC
oklch(93.6% 0.031 34.9)
-
Step 200
200
#FFCBBE
oklch(88.4% 0.062 34.4)
-
Step 300
300
#FFA790
oklch(81% 0.11 35.3)
-
Step 400
400 (this color)
#EF6543
oklch(67.4% 0.178 35)
-
Step 500
500
#F13F00
oklch(63.1% 0.221 35.1)
-
Step 600
600
#CC3400
oklch(55.7% 0.195 35.1)
-
Step 700
700
#AC2A00
oklch(49% 0.172 35)
-
Step 800
800
#8F2100
oklch(42.8% 0.15 35)
-
Step 900
900
#781A00
oklch(37.7% 0.132 34.9)
-
Step 950
950
#4A0D00
oklch(27% 0.094 35.3)
#EF6543 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) | #8B7D3F | 0.179 |
| Deuteranopia (no green cones) | #AD9C3F | 0.164 |
| Tritanopia (no blue cones) | #FF465E | 0.071 |
| Achromatopsia (no color) | #909090 | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EF6543
#EF6543
oklch(67.4% 0.178 35)
- #00A8C4
#00A8C4
oklch(67.3% 0.119 215.2)
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 #EF6543, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Sienna #E76F51 ΔE 0.022
- Tomato #FF6347 ΔE 0.030
- Orange Pant #FB5607 ΔE 0.037
- Orange Pink #FF6F52 ΔE 0.039
- Bright Orange #FF5B00 ΔE 0.040
- Grapefruit #FD5956 ΔE 0.041
- Pinkish Orange #FF724C ΔE 0.042
- Blood Orange #FE4B03 ΔE 0.047
Use #EF6543 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.