#013990
Closest named color: Cobalt (#1E488F). oklch(37.4% 0.153 260.3), rgb(1, 57, 144).
Aa
White text reads best on this color (10.55:1).
About this color
#013990 is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.153 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.048 away. White text reads best on it, at 10.55:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 1.98:1 |
| White text | 10.55:1 |
Values
| HEX | #013990 |
| RGB | rgb(1, 57, 144) |
| HSL | hsl(217, 99%, 28%) |
| OKLCH | oklch(37.4% 0.153 260.3) |
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 #013990 | 10.55:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #013990 | 1.98:1 | Fails | Lc 10.3 | Not readable |
| #013990 text on white | 10.55:1 | AAA | Lc 93.6 | Preferred for body text |
| #013990 text on black | 1.98:1 | Fails | Lc -8.9 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C4DAFF
oklch(88.4% 0.057 260.8)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#669FFF
oklch(70.7% 0.154 260.3)
-
Step 500
500
#3A83FF
oklch(63.1% 0.199 260.3)
-
Step 600
600
#0066F6
oklch(55.6% 0.23 260.3)
-
Step 700
700
#0055D1
oklch(49.1% 0.204 260.3)
-
Step 800
800
#0045AD
oklch(42.6% 0.177 260.3)
-
Step 900
900 (this color)
#013990
oklch(37.4% 0.153 260.3)
-
Step 950
950
#052355
oklch(27% 0.098 260.1)
#013990 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) | #004593 | 0.032 |
| Deuteranopia (no green cones) | #00398E | 0.003 |
| Tritanopia (no blue cones) | #00505E | 0.118 |
| Achromatopsia (no color) | #3F3F3F | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #013990
#013990
oklch(37.4% 0.153 260.3)
- #563B00
#563B00
oklch(37.3% 0.077 79.7)
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 #013990, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.048
- Twilight Blue #0A437A ΔE 0.049
- Sapphire #2138AB ΔE 0.050
- Marine Blue #01386A ΔE 0.065
- Royal #0C1793 ΔE 0.067
- Light Navy #155084 ΔE 0.072
- Blueberry #464196 ΔE 0.078
- Dark Slate Blue #483D8B ΔE 0.079
Use #013990 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.