#2D3F79
Closest named color: Twilight Blue (#0A437A). oklch(38.5% 0.101 268.4), rgb(45, 63, 121).
Aa
White text reads best on this color (10.00:1).
About this color
#2D3F79 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.101 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.030 away. White text reads best on it, at 10.00:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.09:1 |
| White text | 10.00:1 |
Values
| HEX | #2D3F79 |
| RGB | rgb(45, 63, 121) |
| HSL | hsl(226, 46%, 33%) |
| OKLCH | oklch(38.5% 0.101 268.4) |
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 #2D3F79 | 10.00:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #2D3F79 | 2.09:1 | Fails | Lc 10.9 | Not readable |
| #2D3F79 text on white | 10.00:1 | AAA | Lc 93.0 | Preferred for body text |
| #2D3F79 text on black | 2.09:1 | Fails | Lc -9.5 | 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
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ACBFF3
oklch(80.8% 0.077 269)
-
Step 400
400
#819DEC
oklch(70.7% 0.12 268.4)
-
Step 500
500
#6282E6
oklch(63% 0.155 268.4)
-
Step 600
600
#4A69D5
oklch(55.6% 0.169 268.4)
-
Step 700
700
#3C57B8
oklch(49.1% 0.156 268.4)
-
Step 800
800
#324895
oklch(42.8% 0.129 268.5)
-
Step 900
900 (this color)
#2D3F79
oklch(38.5% 0.101 268.4)
-
Step 950
950
#192445
oklch(26.9% 0.063 268.1)
#2D3F79 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) | #23467B | 0.021 |
| Deuteranopia (no green cones) | #173F78 | 0.023 |
| Tritanopia (no blue cones) | #004C56 | 0.087 |
| Achromatopsia (no color) | #424242 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3F79
#2D3F79
oklch(38.5% 0.101 268.4)
- #554100
#554100
oklch(38.6% 0.079 88.8)
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 #2D3F79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.030
- Cobalt #1E488F ΔE 0.042
- Light Navy #155084 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.051
- Marine Blue #01386A ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.061
- Dusk Blue #26538D ΔE 0.061
- Blueberry #464196 ΔE 0.062
Use #2D3F79 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.