#213657
Closest named color: Prussian Blue (#1D3557). oklch(33.3% 0.065 259.1), rgb(33, 54, 87).
Aa
White text reads best on this color (12.13:1).
About this color
#213657 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.065 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.006 away. White text reads best on it, at 12.13:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.72:1 |
| White text | 12.13:1 |
Values
| HEX | #213657 |
| RGB | rgb(33, 54, 87) |
| HSL | hsl(217, 45%, 24%) |
| OKLCH | oklch(33.3% 0.065 259.1) |
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 #213657 | 12.13:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #213657 | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #213657 text on white | 12.13:1 | AAA | Lc 97.6 | Preferred for body text |
| #213657 text on black | 1.72:1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AEC2E1
oklch(80.9% 0.049 259.1)
-
Step 400
400
#84A2D1
oklch(70.7% 0.077 259.2)
-
Step 500
500
#658AC5
oklch(63.1% 0.099 259.5)
-
Step 600
600
#4C73B2
oklch(55.6% 0.108 259.6)
-
Step 700
700
#3D6199
oklch(49.2% 0.099 258.9)
-
Step 800
800
#324F7C
oklch(42.7% 0.083 258.9)
-
Step 900
900 (this color)
#213657
oklch(33.3% 0.065 259.1)
-
Step 950
950
#1A273A
oklch(27% 0.04 257.8)
#213657 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) | #283858 | 0.012 |
| Deuteranopia (no green cones) | #223356 | 0.009 |
| Tritanopia (no blue cones) | #003D42 | 0.057 |
| Achromatopsia (no color) | #363636 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #213657
#213657
oklch(33.3% 0.065 259.1)
- #483106
#483106
oklch(33.2% 0.064 77.7)
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 #213657, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.006
- Dark Blue Grey #1F3B4D ΔE 0.027
- Midnight Green #073B4C ΔE 0.036
- Marine Blue #01386A ΔE 0.039
- Gunmetal #293241 ΔE 0.039
- Space Cadet #2B2D42 ΔE 0.042
- Marine #042E60 ΔE 0.043
- Onyx #343A40 ΔE 0.053
Use #213657 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.