#1F487B
Closest named color: Twilight Blue (#0A437A). oklch(40% 0.098 255.3), rgb(31, 72, 123).
Aa
White text reads best on this color (9.24:1).
About this color
#1F487B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.098 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.022 away. White text reads best on it, at 9.24:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.27:1 |
| White text | 9.24:1 |
Values
| HEX | #1F487B |
| RGB | rgb(31, 72, 123) |
| HSL | hsl(213, 60%, 30%) |
| OKLCH | oklch(40% 0.098 255.3) |
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 #1F487B | 9.24:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #1F487B | 2.27:1 | Fails | Lc 12.9 | Not readable |
| #1F487B text on white | 9.24:1 | AAA | Lc 91.0 | Preferred for body text |
| #1F487B text on black | 2.27:1 | Fails | Lc -11.3 | 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
#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
#A1C3F0
oklch(80.8% 0.074 255.6)
-
Step 400
400
#6DA3E9
oklch(70.7% 0.118 255.4)
-
Step 500
500
#448AE2
oklch(63.1% 0.151 255.4)
-
Step 600
600
#2272D0
oklch(55.6% 0.163 255.5)
-
Step 700
700
#135FB4
oklch(49.1% 0.152 255.4)
-
Step 800
800
#144E91
oklch(42.6% 0.125 255.2)
-
Step 900
900 (this color)
#1F487B
oklch(40% 0.098 255.3)
-
Step 950
950
#102744
oklch(27.1% 0.062 255.3)
#1F487B 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) | #304C7D | 0.023 |
| Deuteranopia (no green cones) | #22437A | 0.015 |
| Tritanopia (no blue cones) | #00545B | 0.076 |
| Achromatopsia (no color) | #474747 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F487B
#1F487B
oklch(40% 0.098 255.3)
- #624000
#624000
oklch(40.1% 0.085 75)
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 #1F487B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.022
- Light Navy #155084 ΔE 0.025
- Cobalt #1E488F ΔE 0.034
- Deep Sea Blue #015482 ΔE 0.036
- Dusk Blue #26538D ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.054
- Light Navy Blue #2E5A88 ΔE 0.059
- Marine Blue #01386A ΔE 0.061
Use #1F487B 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.