#21306E
Closest named color: Marine Blue (#01386A). oklch(33.5% 0.109 269.4), rgb(33, 48, 110).
Aa
White text reads best on this color (12.26:1).
About this color
#21306E is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.109 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.032 away. White text reads best on it, at 12.26:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.71:1 |
| White text | 12.26:1 |
Values
| HEX | #21306E |
| RGB | rgb(33, 48, 110) |
| HSL | hsl(228, 54%, 28%) |
| OKLCH | oklch(33.5% 0.109 269.4) |
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 #21306E | 12.26:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #21306E | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #21306E text on white | 12.26:1 | AAA | Lc 97.6 | Preferred for body text |
| #21306E text on black | 1.71:1 | Fails | Lc 0.0 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CDD9F8
oklch(88.6% 0.045 268.7)
-
Step 300
300
#ABBFF6
oklch(80.9% 0.081 269)
-
Step 400
400
#809CF2
oklch(70.8% 0.13 269.2)
-
Step 500
500
#6280EE
oklch(63.1% 0.168 269.6)
-
Step 600
600
#4A67DC
oklch(55.7% 0.181 269.2)
-
Step 700
700
#3C54BF
oklch(49% 0.17 269.6)
-
Step 800
800
#31469A
oklch(42.7% 0.139 269.2)
-
Step 900
900 (this color)
#21306E
oklch(33.5% 0.109 269.4)
-
Step 950
950
#192348
oklch(26.9% 0.07 269.8)
#21306E 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) | #053970 | 0.030 |
| Deuteranopia (no green cones) | #00326D | 0.027 |
| Tritanopia (no blue cones) | #003F4A | 0.090 |
| Achromatopsia (no color) | #353535 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21306E
#21306E
oklch(33.5% 0.109 269.4)
- #453400
#453400
oklch(33.5% 0.068 88.4)
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 #21306E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.032
- Marine #042E60 ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.046
- Twilight Blue #0A437A ΔE 0.056
- Midnight Blue #191970 ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.073
- Midnight Green #073B4C ΔE 0.078
- Space Cadet #2B2D42 ΔE 0.078
Use #21306E 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.