#21338C
Closest named color: Sapphire (#2138AB). oklch(36.8% 0.149 268.9), rgb(33, 51, 140).
Aa
White text reads best on this color (10.95:1).
About this color
#21338C is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.149 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.053 away. White text reads best on it, at 10.95:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.91:1 |
| White text | 10.95:1 |
Values
| HEX | #21338C |
| RGB | rgb(33, 51, 140) |
| HSL | hsl(230, 62%, 34%) |
| OKLCH | oklch(36.8% 0.149 268.9) |
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 #21338C | 10.95:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #21338C | 1.91:1 | Fails | Lc 9.1 | Not readable |
| #21338C text on white | 10.95:1 | AAA | Lc 94.8 | Preferred for body text |
| #21338C text on black | 1.91:1 | Fails | Lc -7.8 | Not readable |
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 900.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BEFF
oklch(80.8% 0.096 269.2)
-
Step 400
400
#7A9AFF
oklch(70.7% 0.152 269)
-
Step 500
500
#5A7CFF
oklch(63% 0.198 269.1)
-
Step 600
600
#3E5AFF
oklch(55.6% 0.244 269)
-
Step 700
700
#3147E0
oklch(49.1% 0.23 268.9)
-
Step 800
800
#283CB5
oklch(42.7% 0.191 268.9)
-
Step 900
900 (this color)
#21338C
oklch(36.8% 0.149 268.9)
-
Step 950
950
#142154
oklch(27.1% 0.094 268.5)
#21338C 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) | #00428F | 0.040 |
| Deuteranopia (no green cones) | #00388A | 0.024 |
| Tritanopia (no blue cones) | #004A5A | 0.118 |
| Achromatopsia (no color) | #3C3C3C | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21338C
#21338C
oklch(36.8% 0.149 268.9)
- #4F3C00
#4F3C00
oklch(36.7% 0.075 88.5)
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 #21338C, closest first.
No curated palette has a color within ΔE 0.04 of #21338C.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.053
- Cobalt #1E488F ΔE 0.055
- Twilight Blue #0A437A ΔE 0.055
- Royal #0C1793 ΔE 0.063
- Marine Blue #01386A ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.066
- Blueberry #464196 ΔE 0.070
- Indigo Blue #3A18B1 ΔE 0.076
Use #21338C 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.