#13437A
Closest named color: Twilight Blue (#0A437A). oklch(38.3% 0.106 254.7), rgb(19, 67, 122).
Aa
White text reads best on this color (9.94:1).
About this color
#13437A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.106 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.005 away. White text reads best on it, at 9.94:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.11:1 |
| White text | 9.94:1 |
Values
| HEX | #13437A |
| RGB | rgb(19, 67, 122) |
| HSL | hsl(212, 73%, 28%) |
| OKLCH | oklch(38.3% 0.106 254.7) |
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 #13437A | 9.94:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #13437A | 2.11:1 | Fails | Lc 11.3 | Not readable |
| #13437A text on white | 9.94:1 | AAA | Lc 92.7 | Preferred for body text |
| #13437A text on black | 2.11:1 | Fails | Lc -9.8 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9EC4F4
oklch(81% 0.08 254.5)
-
Step 400
400
#67A3EE
oklch(70.6% 0.127 254.7)
-
Step 500
500
#398AE9
oklch(63.1% 0.163 254.6)
-
Step 600
600
#0A71D7
oklch(55.5% 0.177 254.8)
-
Step 700
700
#005FB8
oklch(49.1% 0.16 254.6)
-
Step 800
800
#044E97
oklch(42.8% 0.136 254.5)
-
Step 900
900 (this color)
#13437A
oklch(38.3% 0.106 254.7)
-
Step 950
950
#0C2746
oklch(27.1% 0.066 254)
#13437A 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) | #27487C | 0.025 |
| Deuteranopia (no green cones) | #133E79 | 0.015 |
| Tritanopia (no blue cones) | #005058 | 0.080 |
| Achromatopsia (no color) | #434343 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #13437A
#13437A
oklch(38.3% 0.106 254.7)
- #5C3C00
#5C3C00
oklch(38.4% 0.081 75.2)
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 #13437A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.005
- Cobalt #1E488F ΔE 0.039
- Light Navy #155084 ΔE 0.041
- Marine Blue #01386A ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.050
- Dusk Blue #26538D ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.068
Use #13437A 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.