#2D3A71
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.096 271), rgb(45, 58, 113).
Aa
White text reads best on this color (10.74:1).
About this color
#2D3A71 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.096 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 10.74:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #2D3A71 |
| RGB | rgb(45, 58, 113) |
| HSL | hsl(229, 43%, 31%) |
| OKLCH | oklch(36.8% 0.096 271) |
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 #2D3A71 | 10.74:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #2D3A71 | 1.95:1 | Fails | Lc 9.2 | Not readable |
| #2D3A71 text on white | 10.74:1 | AAA | Lc 94.7 | Preferred for body text |
| #2D3A71 text on black | 1.95:1 | Fails | Lc -7.9 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4E9F8
oklch(93.5% 0.021 271.2)
-
Step 200
200
#CFD8F4
oklch(88.4% 0.04 271.4)
-
Step 300
300
#AFBFF0
oklch(80.9% 0.072 270.6)
-
Step 400
400
#869CE8
oklch(70.7% 0.114 270.9)
-
Step 500
500
#6982E1
oklch(63.1% 0.146 270.7)
-
Step 600
600
#5269CF
oklch(55.6% 0.159 270.9)
-
Step 700
700
#4357B3
oklch(49.1% 0.147 270.8)
-
Step 800
800
#374791
oklch(42.6% 0.123 271.1)
-
Step 900
900 (this color)
#2D3A71
oklch(36.8% 0.096 271)
-
Step 950
950
#1C2444
oklch(27.1% 0.06 271.3)
#2D3A71 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) | #204173 | 0.023 |
| Deuteranopia (no green cones) | #173B70 | 0.024 |
| Tritanopia (no blue cones) | #014650 | 0.084 |
| Achromatopsia (no color) | #3E3E3E | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3A71
#2D3A71
oklch(36.8% 0.096 271)
- #4E3D00
#4E3D00
oklch(36.8% 0.075 91)
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 #2D3A71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Marine Blue #01386A ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.059
- Cobalt #1E488F ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.062
- Marine #042E60 ΔE 0.066
- Light Navy #155084 ΔE 0.067
Use #2D3A71 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.