#EF6434
Closest named color: Burnt Sienna (#E76F51). oklch(67.1% 0.182 38.6), rgb(239, 100, 52).
Aa
Black text reads best on this color (6.54:1).
About this color
#EF6434 is a medium-light, vivid red. In OKLCH its lightness is 67%, its chroma 0.182 and its hue 39°. Its hue sits on the warm side of the wheel. The nearest named color is Burnt Sienna (#E76F51), ΔE 0.029 away. Black text reads best on it, at 6.54:1.
| Hue family | Reds |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.182) |
| Temperature | warm |
| Nearest name | Burnt Sienna (#E76F51) |
| Black text | 6.54:1 |
| White text | 3.20:1 |
Values
| HEX | #EF6434 |
| RGB | rgb(239, 100, 52) |
| HSL | hsl(15, 85%, 57%) |
| OKLCH | oklch(67.1% 0.182 38.6) |
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 #EF6434 | 3.20:1 | AA large text | Lc -63.9 | Content text, not long reading |
| Black text on #EF6434 | 6.54:1 | AA | Lc 45.6 | Large or bold text, headings |
| #EF6434 text on white | 3.20:1 | AA large text | Lc 58.5 | Large or bold text, headings |
| #EF6434 text on black | 6.54:1 | AA | Lc -43.3 | 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
#FFF2EE
oklch(97% 0.015 37.9)
-
Step 100
100
#FFE3DA
oklch(93.6% 0.033 38.6)
-
Step 200
200
#FFCCBB
oklch(88.5% 0.063 39.2)
-
Step 300
300
#FFA78B
oklch(80.9% 0.112 38.4)
-
Step 400
400 (this color)
#EF6434
oklch(67.1% 0.182 38.6)
-
Step 500
500
#E94C00
oklch(63% 0.204 38.6)
-
Step 600
600
#C53F00
oklch(55.6% 0.18 38.6)
-
Step 700
700
#A73400
oklch(49.2% 0.159 38.6)
-
Step 800
800
#8A2900
oklch(42.7% 0.139 38.4)
-
Step 900
900
#742100
oklch(37.7% 0.122 38.4)
-
Step 950
950
#481100
oklch(27.1% 0.088 38.3)
#EF6434 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) | #8B7C2D | 0.180 |
| Deuteranopia (no green cones) | #AD9B2F | 0.164 |
| Tritanopia (no blue cones) | #FF435A | 0.079 |
| Achromatopsia (no color) | #909090 | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EF6434
#EF6434
oklch(67.1% 0.182 38.6)
- #00A7C7
#00A7C7
oklch(67.2% 0.121 218)
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 #EF6434, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Sienna #E76F51 ΔE 0.029
- Orange Pant #FB5607 ΔE 0.030
- Bright Orange #FF5B00 ΔE 0.033
- Tomato #FF6347 ΔE 0.035
- Blood Orange #FE4B03 ΔE 0.043
- Orange Pink #FF6F52 ΔE 0.045
- Pinkish Orange #FF724C ΔE 0.046
- Orange Red #FF4500 ΔE 0.050
Use #EF6434 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.