#21396B
Closest named color: Marine Blue (#01386A). oklch(35.4% 0.092 263.2), rgb(33, 57, 107).
Aa
White text reads best on this color (11.27:1).
About this color
#21396B is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.092 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.025 away. White text reads best on it, at 11.27:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.86:1 |
| White text | 11.27:1 |
Values
| HEX | #21396B |
| RGB | rgb(33, 57, 107) |
| HSL | hsl(221, 53%, 27%) |
| OKLCH | oklch(35.4% 0.092 263.2) |
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 #21396B | 11.27:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #21396B | 1.86:1 | Fails | Lc 8.1 | Not readable |
| #21396B text on white | 11.27:1 | AAA | Lc 95.8 | Preferred for body text |
| #21396B text on black | 1.86:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C1EE
oklch(80.8% 0.069 262.9)
-
Step 400
400
#7CA0E6
oklch(70.8% 0.111 263)
-
Step 500
500
#5B86DE
oklch(63% 0.141 263.3)
-
Step 600
600
#426ECC
oklch(55.6% 0.154 263.4)
-
Step 700
700
#345CB0
oklch(49.2% 0.141 263.1)
-
Step 800
800
#2B4B8F
oklch(42.6% 0.119 263.3)
-
Step 900
900 (this color)
#21396B
oklch(35.4% 0.092 263.2)
-
Step 950
950
#172543
oklch(26.9% 0.059 264)
#21396B 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) | #213E6D | 0.015 |
| Deuteranopia (no green cones) | #15376A | 0.015 |
| Tritanopia (no blue cones) | #00444C | 0.076 |
| Achromatopsia (no color) | #3B3B3B | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21396B
#21396B
oklch(35.4% 0.092 263.2)
- #4E3700
#4E3700
oklch(35.4% 0.073 82.4)
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 #21396B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.036
- Twilight Blue #0A437A ΔE 0.037
- Marine #042E60 ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.056
- Midnight Green #073B4C ΔE 0.063
- Charcoal #264653 ΔE 0.066
Use #21396B 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.