#21396F
Closest named color: Marine Blue (#01386A). oklch(35.6% 0.098 264.1), rgb(33, 57, 111).
Aa
White text reads best on this color (11.17:1).
About this color
#21396F is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.098 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.027 away. White text reads best on it, at 11.17:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.87:1 |
| White text | 11.17:1 |
Values
| HEX | #21396F |
| RGB | rgb(33, 57, 111) |
| HSL | hsl(222, 54%, 28%) |
| OKLCH | oklch(35.6% 0.098 264.1) |
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 #21396F | 11.17:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #21396F | 1.87:1 | Fails | Lc 8.3 | Not readable |
| #21396F text on white | 11.17:1 | AAA | Lc 95.6 | Preferred for body text |
| #21396F text on black | 1.87:1 | 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCDAF5
oklch(88.6% 0.04 263.7)
-
Step 300
300
#A9C1F1
oklch(81% 0.073 264)
-
Step 400
400
#7B9FEA
oklch(70.7% 0.118 264.1)
-
Step 500
500
#5A85E4
oklch(63.1% 0.151 264.2)
-
Step 600
600
#406DD2
oklch(55.7% 0.164 263.8)
-
Step 700
700
#335AB6
oklch(49.1% 0.153 264.2)
-
Step 800
800
#2A4A93
oklch(42.7% 0.126 264)
-
Step 900
900 (this color)
#21396F
oklch(35.6% 0.098 264.1)
-
Step 950
950
#172545
oklch(27% 0.063 264.7)
#21396F 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) | #1E3F71 | 0.017 |
| Deuteranopia (no green cones) | #0E386E | 0.018 |
| Tritanopia (no blue cones) | #00454E | 0.080 |
| Achromatopsia (no color) | #3B3B3B | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21396F
#21396F
oklch(35.6% 0.098 264.1)
- #4E3800
#4E3800
oklch(35.6% 0.073 83.9)
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 #21396F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.027
- Twilight Blue #0A437A ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.043
- Marine #042E60 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.062
- Cobalt #1E488F ΔE 0.065
- Midnight Green #073B4C ΔE 0.069
Use #21396F 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.