#212B57
Closest named color: Marine (#042E60). oklch(30.5% 0.08 271.3), rgb(33, 43, 87).
Aa
White text reads best on this color (13.56:1).
About this color
#212B57 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.080 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.031 away. White text reads best on it, at 13.56:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.54:1 |
| White text | 13.56:1 |
Values
| HEX | #212B57 |
| RGB | rgb(33, 43, 87) |
| HSL | hsl(229, 45%, 24%) |
| OKLCH | oklch(30.5% 0.08 271.3) |
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 #212B57 | 13.56:1 | AAA | Lc -103.1 | Preferred for body text |
| Black text on #212B57 | 1.54:1 | Fails | Lc 0.0 | Not readable |
| #212B57 text on white | 13.56:1 | AAA | Lc 99.9 | Preferred for body text |
| #212B57 text on black | 1.54:1 | 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 950.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FD
oklch(88.5% 0.053 271.1)
-
Step 300
300
#AABEFF
oklch(81% 0.095 271)
-
Step 400
400
#7F99FE
oklch(70.8% 0.151 271.2)
-
Step 500
500
#617BFD
oklch(63.1% 0.194 271.3)
-
Step 600
600
#4B60EC
oklch(55.6% 0.211 271.3)
-
Step 700
700
#3D4ECD
oklch(49.1% 0.195 271.3)
-
Step 800
800
#3241A6
oklch(42.7% 0.162 271.3)
-
Step 900
900
#2B3883
oklch(37.6% 0.126 271.5)
-
Step 950
950 (this color)
#212B57
oklch(30.5% 0.08 271.3)
#212B57 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) | #163159 | 0.021 |
| Deuteranopia (no green cones) | #0F2C56 | 0.021 |
| Tritanopia (no blue cones) | #01353C | 0.072 |
| Achromatopsia (no color) | #2E2E2E | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #212B57
#212B57
oklch(30.5% 0.08 271.3)
- #3B2E00
#3B2E00
oklch(30.7% 0.063 91.8)
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 #212B57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.031
- Space Cadet #2B2D42 ΔE 0.043
- Marine Blue #01386A ΔE 0.050
- Gunmetal #293241 ΔE 0.052
- Oxford Blue #1B263B ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.058
- Midnight Green #073B4C ΔE 0.062
Use #212B57 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.