#1B407F
Closest named color: Twilight Blue (#0A437A). oklch(38.2% 0.115 260.3), rgb(27, 64, 127).
Aa
White text reads best on this color (10.06:1).
About this color
#1B407F is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.115 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.016 away. White text reads best on it, at 10.06:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.08:1 |
| White text | 10.06:1 |
Values
| HEX | #1B407F |
| RGB | rgb(27, 64, 127) |
| HSL | hsl(218, 65%, 30%) |
| OKLCH | oklch(38.2% 0.115 260.3) |
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 #1B407F | 10.06:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #1B407F | 2.08:1 | Fails | Lc 10.9 | Not readable |
| #1B407F text on white | 10.06:1 | AAA | Lc 93.0 | Preferred for body text |
| #1B407F 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A1C2F9
oklch(81% 0.086 260.5)
-
Step 400
400
#6DA0F6
oklch(70.7% 0.138 260.4)
-
Step 500
500
#4585F2
oklch(63% 0.177 260.3)
-
Step 600
600
#266CE1
oklch(55.6% 0.192 260.3)
-
Step 700
700
#1959C3
oklch(49% 0.178 260.3)
-
Step 800
800
#174A9E
oklch(42.8% 0.147 260.1)
-
Step 900
900 (this color)
#1B407F
oklch(38.2% 0.115 260.3)
-
Step 950
950
#102549
oklch(26.9% 0.072 260.4)
#1B407F 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) | #1D4781 | 0.021 |
| Deuteranopia (no green cones) | #003E7E | 0.018 |
| Tritanopia (no blue cones) | #004F59 | 0.090 |
| Achromatopsia (no color) | #424242 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B407F
#1B407F
oklch(38.2% 0.115 260.3)
- #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 #1B407F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.016
- Cobalt #1E488F ΔE 0.034
- Light Navy #155084 ΔE 0.046
- Marine Blue #01386A ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.058
- Dusk Blue #26538D ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.063
- Blueberry #464196 ΔE 0.068
Use #1B407F 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.