#2D3689
Closest named color: Cobalt (#1E488F). oklch(37.8% 0.137 273.2), rgb(45, 54, 137).
Aa
White text reads best on this color (10.49:1).
About this color
#2D3689 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.137 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.048 away. White text reads best on it, at 10.49:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.00:1 |
| White text | 10.49:1 |
Values
| HEX | #2D3689 |
| RGB | rgb(45, 54, 137) |
| HSL | hsl(234, 51%, 36%) |
| OKLCH | oklch(37.8% 0.137 273.2) |
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 #2D3689 | 10.49:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #2D3689 | 2.00:1 | Fails | Lc 10.0 | Not readable |
| #2D3689 text on white | 10.49:1 | AAA | Lc 93.9 | Preferred for body text |
| #2D3689 text on black | 2.00:1 | Fails | Lc -8.6 | 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
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8297FF
oklch(70.6% 0.154 273.2)
-
Step 500
500
#6679FF
oklch(63.1% 0.198 273.3)
-
Step 600
600
#4F5AF5
oklch(55.6% 0.228 273.2)
-
Step 700
700
#4148D6
oklch(49.1% 0.213 273.3)
-
Step 800
800
#353DAD
oklch(42.8% 0.176 273.2)
-
Step 900
900 (this color)
#2D3689
oklch(37.8% 0.137 273.2)
-
Step 950
950
#1A2050
oklch(26.9% 0.087 273.6)
#2D3689 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) | #00438C | 0.043 |
| Deuteranopia (no green cones) | #003B87 | 0.037 |
| Tritanopia (no blue cones) | #004A5A | 0.112 |
| Achromatopsia (no color) | #3F3F3F | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3689
#2D3689
oklch(37.8% 0.137 273.2)
- #504000
#504000
oklch(37.8% 0.077 92.8)
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 #2D3689, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.048
- Twilight Blue #0A437A ΔE 0.052
- Blueberry #464196 ΔE 0.054
- Sapphire #2138AB ΔE 0.057
- Marine Blue #01386A ΔE 0.068
- Light Navy #155084 ΔE 0.074
- Dusk Blue #26538D ΔE 0.079
Use #2D3689 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.