Twilight Blue #0A437A
Twilight Blue is a dark, moderately saturated blue with hex code #0A437A and RGB rgb(10, 67, 122).
Aa
White text reads best on this color (10.01:1).
About this color
#0A437A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.108 and its hue 253°. Its hue sits on the cool side of the wheel. It is the named color Twilight Blue. White text reads best on it, at 10.01:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Twilight Blue |
| Black text | 2.09:1 |
| White text | 10.01:1 |
Colors that go with Twilight Blue
Matches found by rotating Twilight Blue around the OKLCH hue wheel, each labelled with the closest name in our list.
Complementary
The opposite hue (180°).
Analogous
Neighbouring hues, 30° either side.
Triadic
Three hues spaced 120° apart.
Color palettes with Twilight Blue
Curated color palettes that contain a color within ΔE 0.06 (OKLab) of Twilight Blue, closest first.
Similar named colors
The eight named colors closest to Twilight Blue, with their ΔE distance.
- Cobalt #1E488F ΔE 0.041
- Marine Blue #01386A ΔE 0.042
- Light Navy #155084 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.060
- Dusk Blue #26538D ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.067
- Charcoal #264653 ΔE 0.072
More about Twilight Blue
How to make Twilight Blue
A starting recipe from common paint colors, found with a spectral paint model (the color mixer’s paint mode). Real pigments vary, so mix a small test batch and adjust.
- 3 parts blue
- 1 part red
Recipe result: #2E497E, a difference of ΔE 0.038 from Twilight Blue. That is close; add a little more of one paint to match.
Codes for Twilight Blue in every format
| HEX | #0A437A |
| RGB | rgb(10, 67, 122) |
| HSL | hsl(209, 85%, 26%) |
| OKLCH | oklch(38.1% 0.108 252.8) |
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 #0A437A | 10.01:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #0A437A | 2.09:1 | Fails | Lc 11.2 | Not readable |
| #0A437A text on white | 10.01:1 | AAA | Lc 92.8 | Preferred for body text |
| #0A437A text on black | 2.09:1 | Fails | Lc -9.7 | Not readable |
Shades and tints of Twilight Blue
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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DCF7
oklch(88.6% 0.045 252.5)
-
Step 300
300
#9BC4F4
oklch(80.8% 0.081 252.7)
-
Step 400
400
#62A4EF
oklch(70.7% 0.13 252.8)
-
Step 500
500
#2F8BEA
oklch(63.1% 0.166 252.8)
-
Step 600
600
#0073D3
oklch(55.6% 0.171 252.9)
-
Step 700
700
#0061B2
oklch(49.2% 0.149 252.5)
-
Step 800
800
#004F94
oklch(42.8% 0.131 252.8)
-
Step 900
900 (this color)
#0A437A
oklch(38.1% 0.108 252.8)
-
Step 950
950
#092747
oklch(27% 0.069 253.1)
Twilight Blue 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) | #26477C | 0.026 |
| Deuteranopia (no green cones) | #103E79 | 0.014 |
| Tritanopia (no blue cones) | #005058 | 0.080 |
| Achromatopsia (no color) | #424242 | 0.108 |
Use Twilight Blue 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.