#1B417B
Closest named color: Twilight Blue (#0A437A). oklch(38.2% 0.108 258.8), rgb(27, 65, 123).
Aa
White text reads best on this color (10.05:1).
About this color
#1B417B is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.108 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.011 away. White text reads best on it, at 10.05:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.08:1 |
| White text | 10.05:1 |
Values
| HEX | #1B417B |
| RGB | rgb(27, 65, 123) |
| HSL | hsl(216, 64%, 29%) |
| OKLCH | oklch(38.2% 0.108 258.8) |
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 #1B417B | 10.05:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #1B417B | 2.08:1 | Fails | Lc 10.9 | Not readable |
| #1B417B text on white | 10.05:1 | AAA | Lc 93.0 | Preferred for body text |
| #1B417B text on black | 2.08:1 | Fails | Lc -9.5 | 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
#C8DBF7
oklch(88.6% 0.044 258)
-
Step 300
300
#A1C2F5
oklch(80.8% 0.081 259)
-
Step 400
400
#6EA1F0
oklch(70.7% 0.129 258.9)
-
Step 500
500
#4687EB
oklch(63% 0.165 258.8)
-
Step 600
600
#266EDA
oklch(55.5% 0.18 258.9)
-
Step 700
700
#185CBD
oklch(49.2% 0.167 258.6)
-
Step 800
800
#174B99
oklch(42.6% 0.139 259)
-
Step 900
900 (this color)
#1B417B
oklch(38.2% 0.108 258.8)
-
Step 950
950
#102647
oklch(27% 0.068 258.4)
#1B417B 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) | #23477D | 0.021 |
| Deuteranopia (no green cones) | #0E3E7A | 0.014 |
| Tritanopia (no blue cones) | #004F58 | 0.084 |
| Achromatopsia (no color) | #424242 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B417B
#1B417B
oklch(38.2% 0.108 258.8)
- #593D00
#593D00
oklch(38.2% 0.079 79.4)
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 #1B417B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.011
- Cobalt #1E488F ΔE 0.038
- Marine Blue #01386A ΔE 0.044
- Light Navy #155084 ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.055
- Dusk Blue #26538D ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.066
Use #1B417B 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.