#1F4389
Closest named color: Cobalt (#1E488F). oklch(39.8% 0.124 262), rgb(31, 67, 137).
Aa
White text reads best on this color (9.44:1).
About this color
#1F4389 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.124 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.016 away. White text reads best on it, at 9.44:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.22:1 |
| White text | 9.44:1 |
Values
| HEX | #1F4389 |
| RGB | rgb(31, 67, 137) |
| HSL | hsl(220, 63%, 33%) |
| OKLCH | oklch(39.8% 0.124 262) |
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 #1F4389 | 9.44:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #1F4389 | 2.22:1 | Fails | Lc 12.5 | Not readable |
| #1F4389 text on white | 9.44:1 | AAA | Lc 91.5 | Preferred for body text |
| #1F4389 text on black | 2.22:1 | Fails | Lc -10.9 | 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
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFC
oklch(88.5% 0.051 262.1)
-
Step 300
300
#A0C1FD
oklch(80.9% 0.093 262.1)
-
Step 400
400
#6C9EFD
oklch(70.6% 0.15 262.2)
-
Step 500
500
#4583FB
oklch(63.2% 0.191 262)
-
Step 600
600
#2768EA
oklch(55.6% 0.208 262.1)
-
Step 700
700
#1A56CB
oklch(49.1% 0.192 261.9)
-
Step 800
800
#1847A4
oklch(42.7% 0.159 262)
-
Step 900
900 (this color)
#1F4389
oklch(39.8% 0.124 262)
-
Step 950
950
#10244C
oklch(26.9% 0.079 262.4)
#1F4389 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) | #194B8C | 0.022 |
| Deuteranopia (no green cones) | #004188 | 0.020 |
| Tritanopia (no blue cones) | #00545F | 0.099 |
| Achromatopsia (no color) | #464646 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4389
#1F4389
oklch(39.8% 0.124 262)
- #5D4200
#5D4200
oklch(39.8% 0.082 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 #1F4389, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.016
- Twilight Blue #0A437A ΔE 0.030
- Light Navy #155084 ΔE 0.039
- Dusk Blue #26538D ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.054
- Blueberry #464196 ΔE 0.055
- Sapphire #2138AB ΔE 0.063
Use #1F4389 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.