#BB3121
Closest named color: Rusty Red (#AF2F0D). oklch(52.6% 0.177 30.4), rgb(187, 49, 33).
Aa
White text reads best on this color (5.87:1).
About this color
#BB3121 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.177 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.029 away. White text reads best on it, at 5.87:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.177) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.57:1 |
| White text | 5.87:1 |
Values
| HEX | #BB3121 |
| RGB | rgb(187, 49, 33) |
| HSL | hsl(6, 70%, 43%) |
| OKLCH | oklch(52.6% 0.177 30.4) |
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 #BB3121 | 5.87:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #BB3121 | 3.57:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #BB3121 text on white | 5.87:1 | AA | Lc 78.0 | Fine for body text |
| #BB3121 text on black | 3.57:1 | AA large text | Lc -23.7 | 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 600.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#F9E5E1
oklch(93.7% 0.023 31.1)
-
Step 200
200
#F5CFC8
oklch(88.5% 0.044 30.2)
-
Step 300
300
#F0AEA2
oklch(81% 0.08 30.5)
-
Step 400
400
#E5806F
oklch(70.7% 0.128 30.6)
-
Step 500
500
#DA5B49
oklch(63% 0.163 30.4)
-
Step 600
600 (this color)
#BB3121
oklch(52.6% 0.177 30.4)
-
Step 700
700
#AA2C1E
oklch(49% 0.165 30.2)
-
Step 800
800
#8A271B
oklch(42.7% 0.136 30.4)
-
Step 900
900
#6F261C
oklch(37.7% 0.106 30.5)
-
Step 950
950
#421711
oklch(27% 0.068 30.2)
#BB3121 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) | #5B511D | 0.189 |
| Deuteranopia (no green cones) | #7D701A | 0.172 |
| Tritanopia (no blue cones) | #CE002F | 0.051 |
| Achromatopsia (no color) | #646464 | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #BB3121
#BB3121
oklch(52.6% 0.177 30.4)
- #007888
#007888
oklch(52.5% 0.091 210.9)
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 #BB3121, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.029
- Sinopia #BB3E03 ΔE 0.030
- Firebrick #B22222 ΔE 0.031
- Dull Red #BB3F3F ΔE 0.031
- Scarlet #BE0119 ΔE 0.037
- Rufous #AE2012 ΔE 0.039
- Rust Red #AA2704 ΔE 0.043
- Lipstick Red #C0022F ΔE 0.045
Use #BB3121 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.