#2D3679
Closest named color: Twilight Blue (#0A437A). oklch(36.5% 0.114 273.6), rgb(45, 54, 121).
Aa
White text reads best on this color (10.96:1).
About this color
#2D3679 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.114 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.044 away. White text reads best on it, at 10.96:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.91:1 |
| White text | 10.96:1 |
Values
| HEX | #2D3679 |
| RGB | rgb(45, 54, 121) |
| HSL | hsl(233, 46%, 33%) |
| OKLCH | oklch(36.5% 0.114 273.6) |
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 #2D3679 | 10.96:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #2D3679 | 1.91:1 | Fails | Lc 8.8 | Not readable |
| #2D3679 text on white | 10.96:1 | AAA | Lc 95.1 | Preferred for body text |
| #2D3679 text on black | 1.91:1 | Fails | Lc -7.5 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CFD8F9
oklch(88.6% 0.047 273.4)
-
Step 300
300
#AFBDF8
oklch(80.9% 0.085 274)
-
Step 400
400
#8699F5
oklch(70.7% 0.136 273.6)
-
Step 500
500
#6A7CF1
oklch(63% 0.175 273.7)
-
Step 600
600
#5462E0
oklch(55.6% 0.19 273.7)
-
Step 700
700
#4550C2
oklch(49% 0.176 273.8)
-
Step 800
800
#38439D
oklch(42.7% 0.145 273.3)
-
Step 900
900 (this color)
#2D3679
oklch(36.5% 0.114 273.6)
-
Step 950
950
#1C2249
oklch(27% 0.072 274)
#2D3679 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) | #0C407B | 0.037 |
| Deuteranopia (no green cones) | #003978 | 0.038 |
| Tritanopia (no blue cones) | #004652 | 0.098 |
| Achromatopsia (no color) | #3C3C3C | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3679
#2D3679
oklch(36.5% 0.114 273.6)
- #4C3D00
#4C3D00
oklch(36.5% 0.075 93.2)
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 #2D3679, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.044
- Marine Blue #01386A ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.057
- Cobalt #1E488F ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.064
- Marine #042E60 ΔE 0.068
- Blueberry #464196 ΔE 0.069
- Light Navy #155084 ΔE 0.074
Use #2D3679 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.