#2D3C8E
Closest named color: Cobalt (#1E488F). oklch(39.4% 0.136 271), rgb(45, 60, 142).
Aa
White text reads best on this color (9.77:1).
About this color
#2D3C8E is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.136 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.033 away. White text reads best on it, at 9.77:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.14:1 |
| White text | 9.77:1 |
Values
| HEX | #2D3C8E |
| RGB | rgb(45, 60, 142) |
| HSL | hsl(231, 52%, 37%) |
| OKLCH | oklch(39.4% 0.136 271) |
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 #2D3C8E | 9.77:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #2D3C8E | 2.14:1 | Fails | Lc 11.7 | Not readable |
| #2D3C8E text on white | 9.77:1 | AAA | Lc 92.3 | Preferred for body text |
| #2D3C8E text on black | 2.14:1 | Fails | Lc -10.1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FE
oklch(93.5% 0.029 271.1)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#AABEFF
oklch(81% 0.095 271)
-
Step 400
400
#7E99FF
oklch(70.7% 0.152 270.9)
-
Step 500
500
#607BFF
oklch(63.2% 0.197 271)
-
Step 600
600
#485CF5
oklch(55.5% 0.227 271.1)
-
Step 700
700
#3A4AD6
oklch(49.1% 0.212 270.9)
-
Step 800
800
#303EAD
oklch(42.7% 0.176 271.2)
-
Step 900
900 (this color)
#2D3C8E
oklch(39.4% 0.136 271)
-
Step 950
950
#182150
oklch(27% 0.087 271.3)
#2D3C8E 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) | #004891 | 0.040 |
| Deuteranopia (no green cones) | #00408C | 0.034 |
| Tritanopia (no blue cones) | #00505F | 0.112 |
| Achromatopsia (no color) | #444444 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3C8E
#2D3C8E
oklch(39.4% 0.136 271)
- #564400
#564400
oklch(39.4% 0.081 91.6)
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 #2D3C8E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.033
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.042
- Twilight Blue #0A437A ΔE 0.049
- Sapphire #2138AB ΔE 0.050
- Light Navy #155084 ΔE 0.061
- Dusk Blue #26538D ΔE 0.063
- Deep Sea Blue #015482 ΔE 0.075
Use #2D3C8E 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.