#1F4383
Closest named color: Twilight Blue (#0A437A). oklch(39.4% 0.116 260.9), rgb(31, 67, 131).
Aa
White text reads best on this color (9.59:1).
About this color
#1F4383 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.116 and its hue 261°. 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 9.59:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.18:1 |
| White text | 9.59:1 |
Values
| HEX | #1F4383 |
| RGB | rgb(31, 67, 131) |
| HSL | hsl(218, 62%, 32%) |
| OKLCH | oklch(39.4% 0.116 260.9) |
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 #1F4383 | 9.59:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #1F4383 | 2.18:1 | Fails | Lc 12.1 | Not readable |
| #1F4383 text on white | 9.59:1 | AAA | Lc 91.9 | Preferred for body text |
| #1F4383 text on black | 2.18:1 | Fails | Lc -10.5 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A1C2F9
oklch(81% 0.086 260.5)
-
Step 400
400
#6EA0F6
oklch(70.8% 0.138 260.7)
-
Step 500
500
#4785F3
oklch(63.2% 0.177 260.9)
-
Step 600
600
#286BE2
oklch(55.6% 0.194 260.9)
-
Step 700
700
#1B59C4
oklch(49.2% 0.179 260.7)
-
Step 800
800
#19499E
oklch(42.6% 0.148 260.9)
-
Step 900
900 (this color)
#1F4383
oklch(39.4% 0.116 260.9)
-
Step 950
950
#10254A
oklch(27% 0.074 260.8)
#1F4383 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) | #204A85 | 0.020 |
| Deuteranopia (no green cones) | #054182 | 0.018 |
| Tritanopia (no blue cones) | #00525C | 0.091 |
| Achromatopsia (no color) | #454545 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4383
#1F4383
oklch(39.4% 0.116 260.9)
- #5C4000
#5C4000
oklch(39.3% 0.081 80.5)
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 #1F4383, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.022
- Cobalt #1E488F ΔE 0.023
- Light Navy #155084 ΔE 0.037
- Dusk Blue #26538D ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.057
- Marine Blue #01386A ΔE 0.058
- Blueberry #464196 ΔE 0.060
Use #1F4383 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.