#1B4275
Closest named color: Twilight Blue (#0A437A). oklch(38% 0.098 256.3), rgb(27, 66, 117).
Aa
White text reads best on this color (10.08:1).
About this color
#1B4275 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.098 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.012 away. White text reads best on it, at 10.08:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.08:1 |
| White text | 10.08:1 |
Values
| HEX | #1B4275 |
| RGB | rgb(27, 66, 117) |
| HSL | hsl(214, 63%, 28%) |
| OKLCH | oklch(38% 0.098 256.3) |
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 #1B4275 | 10.08:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #1B4275 | 2.08:1 | Fails | Lc 10.8 | Not readable |
| #1B4275 text on white | 10.08:1 | AAA | Lc 93.1 | Preferred for body text |
| #1B4275 text on black | 2.08:1 | Fails | Lc -9.4 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A2C3F0
oklch(80.9% 0.073 256.2)
-
Step 400
400
#6FA3E9
oklch(70.8% 0.117 256.1)
-
Step 500
500
#478AE2
oklch(63.2% 0.15 256.1)
-
Step 600
600
#2672D0
oklch(55.7% 0.163 256.1)
-
Step 700
700
#185FB4
oklch(49.2% 0.151 256.1)
-
Step 800
800
#174E92
oklch(42.8% 0.126 256.1)
-
Step 900
900 (this color)
#1B4275
oklch(38% 0.098 256.3)
-
Step 950
950
#102744
oklch(27.1% 0.062 255.3)
#1B4275 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) | #294677 | 0.020 |
| Deuteranopia (no green cones) | #1A3E74 | 0.012 |
| Tritanopia (no blue cones) | #004E55 | 0.077 |
| Achromatopsia (no color) | #424242 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4275
#1B4275
oklch(38% 0.098 256.3)
- #5A3B00
#5A3B00
oklch(37.9% 0.08 75.8)
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 #1B4275, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.012
- Marine Blue #01386A ΔE 0.041
- Light Navy #155084 ΔE 0.045
- Cobalt #1E488F ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.060
- Dusk Blue #26538D ΔE 0.062
Use #1B4275 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.