#212D57
Closest named color: Prussian Blue (#1D3557). oklch(31% 0.077 269.5), rgb(33, 45, 87).
Aa
White text reads best on this color (13.31:1).
About this color
#212D57 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.077 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.025 away. White text reads best on it, at 13.31:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.57:1 |
| White text | 13.31:1 |
Values
| HEX | #212D57 |
| RGB | rgb(33, 45, 87) |
| HSL | hsl(227, 45%, 24%) |
| OKLCH | oklch(31% 0.077 269.5) |
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 #212D57 | 13.31:1 | AAA | Lc -102.8 | Preferred for body text |
| Black text on #212D57 | 1.57:1 | Fails | Lc 0.0 | Not readable |
| #212D57 text on white | 13.31:1 | AAA | Lc 99.6 | Preferred for body text |
| #212D57 text on black | 1.57:1 | 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
#E3EAFC
oklch(93.7% 0.025 268.8)
-
Step 200
200
#CCD8FC
oklch(88.5% 0.051 270.8)
-
Step 300
300
#A9BEFC
oklch(80.8% 0.091 269.8)
-
Step 400
400
#7D9AFB
oklch(70.7% 0.146 269.8)
-
Step 500
500
#5E7EF9
oklch(63.2% 0.186 269.5)
-
Step 600
600
#4763E8
oklch(55.7% 0.203 269.6)
-
Step 700
700
#3951C9
oklch(49.1% 0.188 269.5)
-
Step 800
800
#2F43A3
oklch(42.7% 0.156 269.6)
-
Step 900
900
#293A81
oklch(37.7% 0.121 269.6)
-
Step 950
950 (this color)
#212D57
oklch(31% 0.077 269.5)
#212D57 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) | #1A3259 | 0.016 |
| Deuteranopia (no green cones) | #132D56 | 0.017 |
| Tritanopia (no blue cones) | #00363D | 0.069 |
| Achromatopsia (no color) | #2F2F2F | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #212D57
#212D57
oklch(31% 0.077 269.5)
- #3D2E00
#3D2E00
oklch(31% 0.063 89.1)
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 #212D57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.025
- Marine #042E60 ΔE 0.030
- Space Cadet #2B2D42 ΔE 0.041
- Marine Blue #01386A ΔE 0.046
- Gunmetal #293241 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.053
- Oxford Blue #1B263B ΔE 0.054
- Midnight Green #073B4C ΔE 0.057
Use #212D57 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.