#C33121
Closest named color: Sinopia (#BB3E03). oklch(54% 0.185 30.3), rgb(195, 49, 33).
Aa
White text reads best on this color (5.55:1).
About this color
#C33121 is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.185 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.031 away. White text reads best on it, at 5.55:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.185) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.78:1 |
| White text | 5.55:1 |
Values
| HEX | #C33121 |
| RGB | rgb(195, 49, 33) |
| HSL | hsl(6, 71%, 45%) |
| OKLCH | oklch(54% 0.185 30.3) |
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 #C33121 | 5.55:1 | AA | Lc -81.7 | Fine for body text |
| Black text on #C33121 | 3.78:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #C33121 text on white | 5.55:1 | AA | Lc 76.3 | Fine for body text |
| #C33121 text on black | 3.78:1 | AA large text | Lc -25.4 | 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
#FAE4E0
oklch(93.6% 0.025 29.9)
-
Step 200
200
#F6CFC7
oklch(88.6% 0.046 31.6)
-
Step 300
300
#F2ADA1
oklch(81% 0.084 30)
-
Step 400
400
#E87E6D
oklch(70.7% 0.134 30.3)
-
Step 500
500
#DD5846
oklch(63% 0.17 30.2)
-
Step 600
600 (this color)
#C33121
oklch(54% 0.185 30.3)
-
Step 700
700
#AD2719
oklch(49.1% 0.172 30.2)
-
Step 800
800
#8C2318
oklch(42.6% 0.142 30)
-
Step 900
900
#71241A
oklch(37.7% 0.111 30.3)
-
Step 950
950
#431610
oklch(27% 0.071 30)
#C33121 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) | #5E541D | 0.198 |
| Deuteranopia (no green cones) | #827419 | 0.179 |
| Tritanopia (no blue cones) | #D7002F | 0.050 |
| Achromatopsia (no color) | #686868 | 0.187 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C33121
#C33121
oklch(54% 0.185 30.3)
- #007D8D
#007D8D
oklch(54% 0.094 210.3)
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 #C33121, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.031
- Dull Red #BB3F3F ΔE 0.032
- Scarlet #BE0119 ΔE 0.043
- Rusty Red #AF2F0D ΔE 0.044
- Firebrick #B22222 ΔE 0.045
- Cherry #CF0234 ΔE 0.047
- Brick Orange #C14A09 ΔE 0.047
- Lipstick Red #C0022F ΔE 0.048
Use #C33121 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.