#1F4284
Closest named color: Twilight Blue (#0A437A). oklch(39.2% 0.118 261.6), rgb(31, 66, 132).
Aa
White text reads best on this color (9.67:1).
About this color
#1F4284 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.118 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 9.67:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.17:1 |
| White text | 9.67:1 |
Values
| HEX | #1F4284 |
| RGB | rgb(31, 66, 132) |
| HSL | hsl(219, 62%, 32%) |
| OKLCH | oklch(39.2% 0.118 261.6) |
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 #1F4284 | 9.67:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #1F4284 | 2.17:1 | Fails | Lc 11.9 | Not readable |
| #1F4284 text on white | 9.67:1 | AAA | Lc 92.1 | Preferred for body text |
| #1F4284 text on black | 2.17:1 | Fails | Lc -10.3 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C7DAFB
oklch(88.5% 0.05 261.5)
-
Step 300
300
#A1C1FB
oklch(80.8% 0.09 262.1)
-
Step 400
400
#6E9FF9
oklch(70.7% 0.143 261.7)
-
Step 500
500
#4784F5
oklch(63.1% 0.181 261.5)
-
Step 600
600
#2A6AE4
oklch(55.6% 0.197 261.7)
-
Step 700
700
#1D57C6
oklch(49% 0.184 261.7)
-
Step 800
800
#1A48A0
oklch(42.6% 0.152 261.7)
-
Step 900
900 (this color)
#1F4284
oklch(39.2% 0.118 261.6)
-
Step 950
950
#10254A
oklch(27% 0.074 260.8)
#1F4284 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) | #1D4986 | 0.020 |
| Deuteranopia (no green cones) | #004083 | 0.021 |
| Tritanopia (no blue cones) | #00525C | 0.095 |
| Achromatopsia (no color) | #444444 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4284
#1F4284
oklch(39.2% 0.118 261.6)
- #5B4000
#5B4000
oklch(39.1% 0.081 81.5)
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 #1F4284, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Cobalt #1E488F ΔE 0.023
- Light Navy #155084 ΔE 0.040
- Dusk Blue #26538D ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.056
- Marine Blue #01386A ΔE 0.058
- Blueberry #464196 ΔE 0.059
Use #1F4284 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.