#212D5B
Closest named color: Prussian Blue (#1D3557). oklch(31.3% 0.083 270), rgb(33, 45, 91).
Aa
White text reads best on this color (13.19:1).
About this color
#212D5B is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.083 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.027 away. White text reads best on it, at 13.19:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.59:1 |
| White text | 13.19:1 |
Values
| HEX | #212D5B |
| RGB | rgb(33, 45, 91) |
| HSL | hsl(228, 47%, 24%) |
| OKLCH | oklch(31.3% 0.083 270) |
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 #212D5B | 13.19:1 | AAA | Lc -102.6 | Preferred for body text |
| Black text on #212D5B | 1.59:1 | Fails | Lc 0.0 | Not readable |
| #212D5B text on white | 13.19:1 | AAA | Lc 99.4 | Preferred for body text |
| #212D5B text on black | 1.59:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FE
oklch(93.5% 0.029 271.1)
-
Step 200
200
#CBD8FE
oklch(88.5% 0.054 270.4)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5D7CFF
oklch(63.2% 0.197 269.9)
-
Step 600
600
#465FF1
oklch(55.6% 0.219 270.1)
-
Step 700
700
#384DD2
oklch(49.1% 0.204 270)
-
Step 800
800
#2E40AA
oklch(42.7% 0.17 270.1)
-
Step 900
900
#283886
oklch(37.7% 0.132 270.1)
-
Step 950
950 (this color)
#212D5B
oklch(31.3% 0.083 270)
#212D5B 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) | #17335D | 0.020 |
| Deuteranopia (no green cones) | #0E2E5A | 0.021 |
| Tritanopia (no blue cones) | #00373F | 0.073 |
| Achromatopsia (no color) | #303030 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #212D5B
#212D5B
oklch(31.3% 0.083 270)
- #3E2F00
#3E2F00
oklch(31.3% 0.064 89.4)
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 #212D5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.027
- Marine #042E60 ΔE 0.028
- Marine Blue #01386A ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.047
- Gunmetal #293241 ΔE 0.054
- Dark Blue Grey #1F3B4D ΔE 0.056
- Midnight Green #073B4C ΔE 0.060
- Oxford Blue #1B263B ΔE 0.061
Use #212D5B 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.