#1F4081
Closest named color: Twilight Blue (#0A437A). oklch(38.5% 0.117 262.2), rgb(31, 64, 129).
Aa
White text reads best on this color (9.95:1).
About this color
#1F4081 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.117 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.021 away. White text reads best on it, at 9.95:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.10:1 |
| White text | 9.95:1 |
Values
| HEX | #1F4081 |
| RGB | rgb(31, 64, 129) |
| HSL | hsl(220, 61%, 31%) |
| OKLCH | oklch(38.5% 0.117 262.2) |
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 #1F4081 | 9.95:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #1F4081 | 2.10:1 | Fails | Lc 11.2 | Not readable |
| #1F4081 text on white | 9.95:1 | AAA | Lc 92.8 | Preferred for body text |
| #1F4081 text on black | 2.10:1 | Fails | Lc -9.7 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAFA
oklch(88.5% 0.048 262)
-
Step 300
300
#A2C1FA
oklch(80.9% 0.088 262.4)
-
Step 400
400
#709FF7
oklch(70.7% 0.139 262.1)
-
Step 500
500
#4A84F4
oklch(63.1% 0.179 262)
-
Step 600
600
#2E6AE3
oklch(55.6% 0.195 262.2)
-
Step 700
700
#2158C5
oklch(49.2% 0.18 262)
-
Step 800
800
#1D489F
oklch(42.6% 0.15 262.3)
-
Step 900
900 (this color)
#1F4081
oklch(38.5% 0.117 262.2)
-
Step 950
950
#11254A
oklch(27.1% 0.074 261.5)
#1F4081 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) | #1B4783 | 0.020 |
| Deuteranopia (no green cones) | #003E80 | 0.021 |
| Tritanopia (no blue cones) | #004F5A | 0.091 |
| Achromatopsia (no color) | #434343 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4081
#1F4081
oklch(38.5% 0.117 262.2)
- #593F00
#593F00
oklch(38.6% 0.08 82.1)
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 #1F4081, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.021
- Cobalt #1E488F ΔE 0.031
- Light Navy #155084 ΔE 0.046
- Marine Blue #01386A ΔE 0.052
- Dusk Blue #26538D ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.058
- Blueberry #464196 ΔE 0.063
Use #1F4081 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.