#2A3C7D
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.112 268.9), rgb(42, 60, 125).
Aa
White text reads best on this color (10.28:1).
About this color
#2A3C7D is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.112 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.031 away. White text reads best on it, at 10.28:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.28:1 |
Values
| HEX | #2A3C7D |
| RGB | rgb(42, 60, 125) |
| HSL | hsl(227, 50%, 33%) |
| OKLCH | oklch(37.9% 0.112 268.9) |
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 #2A3C7D | 10.28:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #2A3C7D | 2.04:1 | Fails | Lc 10.3 | Not readable |
| #2A3C7D text on white | 10.28:1 | AAA | Lc 93.6 | Preferred for body text |
| #2A3C7D text on black | 2.04:1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#AABFF8
oklch(80.9% 0.084 268.8)
-
Step 400
400
#7E9CF4
oklch(70.8% 0.134 268.6)
-
Step 500
500
#5F80F0
oklch(63.1% 0.172 268.8)
-
Step 600
600
#4866DF
oklch(55.6% 0.187 269)
-
Step 700
700
#3A54C2
oklch(49.2% 0.174 269)
-
Step 800
800
#30459D
oklch(42.7% 0.145 269.2)
-
Step 900
900 (this color)
#2A3C7D
oklch(37.9% 0.112 268.9)
-
Step 950
950
#182349
oklch(26.9% 0.072 269)
#2A3C7D 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) | #18447F | 0.026 |
| Deuteranopia (no green cones) | #023D7C | 0.031 |
| Tritanopia (no blue cones) | #004B56 | 0.095 |
| Achromatopsia (no color) | #404040 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3C7D
#2A3C7D
oklch(37.9% 0.112 268.9)
- #533F00
#533F00
oklch(37.9% 0.077 88.3)
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 #2A3C7D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.031
- Cobalt #1E488F ΔE 0.042
- Marine Blue #01386A ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.052
- Light Navy #155084 ΔE 0.057
- Blueberry #464196 ΔE 0.061
- Dusk Blue #26538D ΔE 0.067
- Deep Sea Blue #015482 ΔE 0.070
Use #2A3C7D 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.