#EF603C
Closest named color: Burnt Sienna (#E76F51). oklch(66.7% 0.184 35.2), rgb(239, 96, 60).
Aa
Black text reads best on this color (6.40:1).
About this color
#EF603C is a medium-light, vivid red. In OKLCH its lightness is 67%, its chroma 0.184 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Burnt Sienna (#E76F51), ΔE 0.030 away. Black text reads best on it, at 6.40:1.
| Hue family | Reds |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.184) |
| Temperature | warm |
| Nearest name | Burnt Sienna (#E76F51) |
| Black text | 6.40:1 |
| White text | 3.27:1 |
Values
| HEX | #EF603C |
| RGB | rgb(239, 96, 60) |
| HSL | hsl(12, 85%, 59%) |
| OKLCH | oklch(66.7% 0.184 35.2) |
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 #EF603C | 3.27:1 | AA large text | Lc -64.7 | Content text, not long reading |
| Black text on #EF603C | 6.40:1 | AA | Lc 44.8 | Non-text elements, placeholder text |
| #EF603C text on white | 3.27:1 | AA large text | Lc 59.2 | Large or bold text, headings |
| #EF603C text on black | 6.40:1 | AA | Lc -42.5 | 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
#FBE4DE
oklch(93.6% 0.027 35)
-
Step 200
200
#F8CEC3
oklch(88.5% 0.05 35.1)
-
Step 300
300
#F5AC99
oklch(80.9% 0.091 35.2)
-
Step 400
400
#EC7C60
oklch(70.7% 0.145 35.1)
-
Step 500
500 (this color)
#EF603C
oklch(66.7% 0.184 35.2)
-
Step 600
600
#CB3400
oklch(55.5% 0.194 35.2)
-
Step 700
700
#AC2B00
oklch(49.1% 0.171 35.3)
-
Step 800
800
#8E2200
oklch(42.7% 0.148 35.4)
-
Step 900
900
#74210B
oklch(37.8% 0.12 35.1)
-
Step 950
950
#441509
oklch(27% 0.076 35.3)
#EF603C 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) | #887A37 | 0.186 |
| Deuteranopia (no green cones) | #AB9A37 | 0.171 |
| Tritanopia (no blue cones) | #FF3E58 | 0.071 |
| Achromatopsia (no color) | #8E8E8E | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EF603C
#EF603C
oklch(66.7% 0.184 35.2)
- #00A6C1
#00A6C1
oklch(66.7% 0.118 214.7)
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 #EF603C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Sienna #E76F51 ΔE 0.030
- Orange Pant #FB5607 ΔE 0.032
- Tomato #FF6347 ΔE 0.033
- Bright Orange #FF5B00 ΔE 0.037
- Blood Orange #FE4B03 ΔE 0.040
- Grapefruit #FD5956 ΔE 0.041
- Orangey Red #FA4224 ΔE 0.045
- Orange Red #FF4500 ΔE 0.046
Use #EF603C 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.