#212F71
Closest named color: Marine Blue (#01386A). oklch(33.6% 0.115 270), rgb(33, 47, 113).
Aa
White text reads best on this color (12.28:1).
About this color
#212F71 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.115 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.036 away. White text reads best on it, at 12.28:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.70:1 |
| White text | 12.28:1 |
Values
| HEX | #212F71 |
| RGB | rgb(33, 47, 113) |
| HSL | hsl(230, 55%, 29%) |
| OKLCH | oklch(33.6% 0.115 270) |
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 #212F71 | 12.28:1 | AAA | Lc -101.2 | Preferred for body text |
| Black text on #212F71 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #212F71 text on white | 12.28:1 | AAA | Lc 97.6 | Preferred for body text |
| #212F71 text on black | 1.70:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ABBEF9
oklch(80.8% 0.086 270.6)
-
Step 400
400
#7F9BF6
oklch(70.7% 0.137 269.7)
-
Step 500
500
#617FF3
oklch(63.2% 0.176 269.9)
-
Step 600
600
#4A65E1
oklch(55.7% 0.191 269.9)
-
Step 700
700
#3C52C4
oklch(49% 0.179 270.1)
-
Step 800
800
#31449E
oklch(42.6% 0.148 270)
-
Step 900
900 (this color)
#212F71
oklch(33.6% 0.115 270)
-
Step 950
950
#19234A
oklch(27.1% 0.073 270.1)
#212F71 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) | #003973 | 0.033 |
| Deuteranopia (no green cones) | #003170 | 0.027 |
| Tritanopia (no blue cones) | #003F4B | 0.094 |
| Achromatopsia (no color) | #353535 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #212F71
#212F71
oklch(33.6% 0.115 270)
- #443500
#443500
oklch(33.6% 0.069 91.2)
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 #212F71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.036
- Marine #042E60 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.052
- Midnight Blue #191970 ΔE 0.056
- Twilight Blue #0A437A ΔE 0.057
- Royal #0C1793 ΔE 0.079
- Dark Blue Grey #1F3B4D ΔE 0.079
- Cobalt #1E488F ΔE 0.082
Use #212F71 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.