#1B457E
Closest named color: Twilight Blue (#0A437A). oklch(39.3% 0.107 257), rgb(27, 69, 126).
Aa
White text reads best on this color (9.54:1).
About this color
#1B457E is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.107 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.015 away. White text reads best on it, at 9.54:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.19:1 |
| White text | 9.54:1 |
Values
| HEX | #1B457E |
| RGB | rgb(27, 69, 126) |
| HSL | hsl(215, 65%, 30%) |
| OKLCH | oklch(39.3% 0.107 257) |
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 #1B457E | 9.54:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #1B457E | 2.19:1 | Fails | Lc 12.2 | Not readable |
| #1B457E text on white | 9.54:1 | AAA | Lc 91.8 | Preferred for body text |
| #1B457E text on black | 2.19:1 | Fails | Lc -10.6 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#A0C3F5
oklch(80.9% 0.081 257.3)
-
Step 400
400
#6BA2F0
oklch(70.7% 0.129 257.2)
-
Step 500
500
#4188EA
oklch(63% 0.164 257.2)
-
Step 600
600
#1D70D9
oklch(55.7% 0.178 257)
-
Step 700
700
#0D5DBC
oklch(49.1% 0.166 256.9)
-
Step 800
800
#104C98
oklch(42.6% 0.138 257.1)
-
Step 900
900 (this color)
#1B457E
oklch(39.3% 0.107 257)
-
Step 950
950
#0E2647
oklch(27% 0.068 257.1)
#1B457E 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) | #284A80 | 0.021 |
| Deuteranopia (no green cones) | #15417D | 0.014 |
| Tritanopia (no blue cones) | #00525B | 0.082 |
| Achromatopsia (no color) | #454545 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B457E
#1B457E
oklch(39.3% 0.107 257)
- #5E3F00
#5E3F00
oklch(39.3% 0.082 77.3)
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 #1B457E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.015
- Cobalt #1E488F ΔE 0.029
- Light Navy #155084 ΔE 0.032
- Deep Sea Blue #015482 ΔE 0.044
- Dusk Blue #26538D ΔE 0.048
- Marine Blue #01386A ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.064
Use #1B457E 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.