#B00306
Closest named color: Rufous (#AE2012). oklch(47.7% 0.194 28.7), rgb(176, 3, 6).
Aa
White text reads best on this color (7.33:1).
About this color
#B00306 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.194 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.018 away. White text reads best on it, at 7.33:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.194) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 2.86:1 |
| White text | 7.33:1 |
Values
| HEX | #B00306 |
| RGB | rgb(176, 3, 6) |
| HSL | hsl(359, 97%, 35%) |
| OKLCH | oklch(47.7% 0.194 28.7) |
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 #B00306 | 7.33:1 | AAA | Lc -87.9 | Fine for body text |
| Black text on #B00306 | 2.86:1 | Fails | Lc 21.2 | Dividers and decoration only |
| #B00306 text on white | 7.33:1 | AAA | Lc 82.9 | Fine for body text |
| #B00306 text on black | 2.86:1 | Fails | Lc -19.0 | Dividers and decoration only |
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 700.
-
Step 50
50
#FEF3F1
oklch(97.2% 0.012 29.9)
-
Step 100
100
#FCE4E0
oklch(93.7% 0.027 28.9)
-
Step 200
200
#FACDC6
oklch(88.5% 0.052 28.5)
-
Step 300
300
#F7AA9E
oklch(80.9% 0.093 29.1)
-
Step 400
400
#EF7869
oklch(70.7% 0.149 28.8)
-
Step 500
500
#E64D40
oklch(63.1% 0.191 28.6)
-
Step 600
600
#D2231D
oklch(55.6% 0.209 28.6)
-
Step 700
700 (this color)
#B00306
oklch(47.7% 0.194 28.7)
-
Step 800
800
#931510
oklch(42.7% 0.161 28.7)
-
Step 900
900
#761C16
oklch(37.7% 0.125 28.5)
-
Step 950
950
#46130E
oklch(27.1% 0.079 28.9)
#B00306 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) | #494001 | 0.213 |
| Deuteranopia (no green cones) | #6F6200 | 0.189 |
| Tritanopia (no blue cones) | #C3000B | 0.040 |
| Achromatopsia (no color) | #565656 | 0.195 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B00306
#B00306
oklch(47.7% 0.194 28.7)
- #006975
#006975
oklch(47.7% 0.082 208.5)
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 #B00306, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.018
- Firebrick #B22222 ΔE 0.025
- Rust Red #AA2704 ΔE 0.029
- Scarlet #BE0119 ΔE 0.032
- Brown #A52A2A ΔE 0.036
- Burnt Red #9F2305 ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.039
- Carmine #9D0216 ΔE 0.043
Use #B00306 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.