#1B3258
Closest named color: Prussian Blue (#1D3557). oklch(32% 0.074 259.9), rgb(27, 50, 88).
Aa
White text reads best on this color (12.77:1).
About this color
#1B3258 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.074 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.011 away. White text reads best on it, at 12.77:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.64:1 |
| White text | 12.77:1 |
Values
| HEX | #1B3258 |
| RGB | rgb(27, 50, 88) |
| HSL | hsl(217, 53%, 23%) |
| OKLCH | oklch(32% 0.074 259.9) |
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 #1B3258 | 12.77:1 | AAA | Lc -102.1 | Preferred for body text |
| Black text on #1B3258 | 1.64:1 | Fails | Lc 0.0 | Not readable |
| #1B3258 text on white | 12.77:1 | AAA | Lc 98.7 | Preferred for body text |
| #1B3258 text on black | 1.64:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A0C2FA
oklch(80.9% 0.088 260.2)
-
Step 400
400
#6BA0F7
oklch(70.7% 0.14 259.9)
-
Step 500
500
#4285F4
oklch(63% 0.18 260)
-
Step 600
600
#216CE3
oklch(55.7% 0.195 259.8)
-
Step 700
700
#1459C5
oklch(49.1% 0.181 259.9)
-
Step 800
800
#14499F
oklch(42.6% 0.15 260.1)
-
Step 900
900
#183E7E
oklch(37.6% 0.117 260.2)
-
Step 950
950 (this color)
#1B3258
oklch(32% 0.074 259.9)
#1B3258 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) | #21355A | 0.013 |
| Deuteranopia (no green cones) | #183057 | 0.008 |
| Tritanopia (no blue cones) | #003B40 | 0.063 |
| Achromatopsia (no color) | #323232 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3258
#1B3258
oklch(32% 0.074 259.9)
- #442E00
#442E00
oklch(31.9% 0.066 79.9)
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 #1B3258, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.011
- Marine #042E60 ΔE 0.029
- Marine Blue #01386A ΔE 0.036
- Dark Blue Grey #1F3B4D ΔE 0.040
- Midnight Green #073B4C ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.043
- Gunmetal #293241 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.060
Use #1B3258 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.