#1B407C
Closest named color: Twilight Blue (#0A437A). oklch(38% 0.111 259.7), rgb(27, 64, 124).
Aa
White text reads best on this color (10.13:1).
About this color
#1B407C is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.111 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.013 away. White text reads best on it, at 10.13:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.07:1 |
| White text | 10.13:1 |
Values
| HEX | #1B407C |
| RGB | rgb(27, 64, 124) |
| HSL | hsl(217, 64%, 30%) |
| OKLCH | oklch(38% 0.111 259.7) |
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 #1B407C | 10.13:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #1B407C | 2.07:1 | Fails | Lc 10.8 | Not readable |
| #1B407C text on white | 10.13:1 | AAA | Lc 93.2 | Preferred for body text |
| #1B407C text on black | 2.07:1 | Fails | Lc -9.3 | 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
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A1C2F7
oklch(80.9% 0.084 259.8)
-
Step 400
400
#6EA1F3
oklch(70.8% 0.133 259.5)
-
Step 500
500
#4786EE
oklch(63% 0.17 259.9)
-
Step 600
600
#276DDD
oklch(55.6% 0.185 259.7)
-
Step 700
700
#1A5ABF
oklch(49% 0.171 259.8)
-
Step 800
800
#184B9B
oklch(42.8% 0.141 259.5)
-
Step 900
900 (this color)
#1B407C
oklch(38% 0.111 259.7)
-
Step 950
950
#102548
oklch(26.9% 0.071 260)
#1B407C 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) | #20467E | 0.019 |
| Deuteranopia (no green cones) | #073D7B | 0.017 |
| Tritanopia (no blue cones) | #004E58 | 0.085 |
| Achromatopsia (no color) | #414141 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B407C
#1B407C
oklch(38% 0.111 259.7)
- #583D00
#583D00
oklch(38.1% 0.079 80.4)
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 #1B407C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.013
- Cobalt #1E488F ΔE 0.038
- Marine Blue #01386A ΔE 0.044
- Light Navy #155084 ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.058
- Dusk Blue #26538D ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.065
Use #1B407C 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.