#1C3660
Closest named color: Prussian Blue (#1D3557). oklch(33.6% 0.081 259.6), rgb(28, 54, 96).
Aa
White text reads best on this color (12.02:1).
About this color
#1C3660 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.081 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.016 away. White text reads best on it, at 12.02:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.74:1 |
| White text | 12.02:1 |
Values
| HEX | #1C3660 |
| RGB | rgb(28, 54, 96) |
| HSL | hsl(217, 55%, 24%) |
| OKLCH | oklch(33.6% 0.081 259.6) |
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 #1C3660 | 12.02:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #1C3660 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #1C3660 text on white | 12.02:1 | AAA | Lc 97.3 | Preferred for body text |
| #1C3660 text on black | 1.74:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CCDAF0
oklch(88.5% 0.034 259.4)
-
Step 300
300
#AAC2E8
oklch(80.9% 0.06 259.5)
-
Step 400
400
#7CA2DD
oklch(70.8% 0.097 259)
-
Step 500
500
#5B89D4
oklch(63.1% 0.124 259.8)
-
Step 600
600
#4172C1
oklch(55.7% 0.134 259.5)
-
Step 700
700
#325FA7
oklch(49.1% 0.126 259.4)
-
Step 800
800
#2A4E87
oklch(42.7% 0.104 259.2)
-
Step 900
900 (this color)
#1C3660
oklch(33.6% 0.081 259.6)
-
Step 950
950
#17263F
oklch(26.9% 0.051 260.2)
#1C3660 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) | #233A62 | 0.016 |
| Deuteranopia (no green cones) | #18335F | 0.011 |
| Tritanopia (no blue cones) | #004046 | 0.067 |
| Achromatopsia (no color) | #363636 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C3660
#1C3660
oklch(33.6% 0.081 259.6)
- #4A3200
#4A3200
oklch(33.7% 0.07 79.3)
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 #1C3660, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.016
- Marine Blue #01386A ΔE 0.024
- Marine #042E60 ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.041
- Midnight Green #073B4C ΔE 0.046
- Twilight Blue #0A437A ΔE 0.054
- Gunmetal #293241 ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.056
Use #1C3660 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.