#B00523
Closest named color: Firebrick (#B22222). oklch(47.9% 0.191 23.1), rgb(176, 5, 35).
Aa
White text reads best on this color (7.26:1).
About this color
#B00523 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.191 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.024 away. White text reads best on it, at 7.26:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.191) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 2.89:1 |
| White text | 7.26:1 |
Values
| HEX | #B00523 |
| RGB | rgb(176, 5, 35) |
| HSL | hsl(349, 94%, 35%) |
| OKLCH | oklch(47.9% 0.191 23.1) |
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 #B00523 | 7.26:1 | AAA | Lc -87.8 | Fine for body text |
| Black text on #B00523 | 2.89:1 | Fails | Lc 21.3 | Dividers and decoration only |
| #B00523 text on white | 7.26:1 | AAA | Lc 82.8 | Fine for body text |
| #B00523 text on black | 2.89:1 | Fails | Lc -19.2 | 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
#FEF2F1
oklch(97% 0.013 23.2)
-
Step 100
100
#FCE3E1
oklch(93.6% 0.028 23.2)
-
Step 200
200
#FACDC9
oklch(88.6% 0.051 24.1)
-
Step 300
300
#F7A9A5
oklch(80.9% 0.093 22.6)
-
Step 400
400
#EF7774
oklch(70.7% 0.149 23)
-
Step 500
500
#E54C50
oklch(63% 0.189 23)
-
Step 600
600
#D12334
oklch(55.7% 0.206 23.1)
-
Step 700
700 (this color)
#B00523
oklch(47.9% 0.191 23.1)
-
Step 800
800
#921521
oklch(42.7% 0.158 23.2)
-
Step 900
900
#751C20
oklch(37.6% 0.123 23.1)
-
Step 950
950
#451213
oklch(26.9% 0.078 23)
#B00523 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) | #484122 | 0.212 |
| Deuteranopia (no green cones) | #6E621B | 0.192 |
| Tritanopia (no blue cones) | #C20016 | 0.039 |
| Achromatopsia (no color) | #575757 | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B00523
#B00523
oklch(47.9% 0.191 23.1)
- #006B72
#006B72
oklch(48.1% 0.082 202.7)
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 #B00523, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.024
- Rouge #AB1239 ΔE 0.026
- Rufous #AE2012 ΔE 0.027
- Scarlet #BE0119 ΔE 0.031
- Brown #A52A2A ΔE 0.032
- Lipstick Red #C0022F ΔE 0.036
- Rust Red #AA2704 ΔE 0.040
- Rose Red #BE013C ΔE 0.041
Use #B00523 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.