#1F4183
Closest named color: Twilight Blue (#0A437A). oklch(38.9% 0.118 262), rgb(31, 65, 131).
Aa
White text reads best on this color (9.80:1).
About this color
#1F4183 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 0.022 away. White text reads best on it, at 9.80:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.14:1 |
| White text | 9.80:1 |
Values
| HEX | #1F4183 |
| RGB | rgb(31, 65, 131) |
| HSL | hsl(220, 62%, 32%) |
| OKLCH | oklch(38.9% 0.118 262) |
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 #1F4183 | 9.80:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #1F4183 | 2.14:1 | Fails | Lc 11.6 | Not readable |
| #1F4183 text on white | 9.80:1 | AAA | Lc 92.4 | Preferred for body text |
| #1F4183 text on black | 2.14:1 | Fails | Lc -10.1 | 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
#C8DAFB
oklch(88.5% 0.05 262.6)
-
Step 300
300
#A1C1FB
oklch(80.8% 0.09 262.1)
-
Step 400
400
#6F9FF8
oklch(70.7% 0.141 261.9)
-
Step 500
500
#4984F5
oklch(63.2% 0.18 261.9)
-
Step 600
600
#2C6AE4
oklch(55.6% 0.197 262)
-
Step 700
700
#1F57C6
oklch(49% 0.183 262)
-
Step 800
800
#1B48A0
oklch(42.6% 0.151 261.9)
-
Step 900
900 (this color)
#1F4183
oklch(38.9% 0.118 262)
-
Step 950
950
#11254A
oklch(27.1% 0.074 261.5)
#1F4183 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) | #1B4885 | 0.020 |
| Deuteranopia (no green cones) | #003F82 | 0.021 |
| Tritanopia (no blue cones) | #00515B | 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°).
- #1F4183
#1F4183
oklch(38.9% 0.118 262)
- #5A4000
#5A4000
oklch(39% 0.08 82.4)
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 #1F4183, 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 0.026
- Light Navy #155084 ΔE 0.043
- Dusk Blue #26538D ΔE 0.054
- Marine Blue #01386A ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.057
- Blueberry #464196 ΔE 0.061
Use #1F4183 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.