#2E3F8B
Closest named color: Cobalt (#1E488F). oklch(39.9% 0.128 270.2), rgb(46, 63, 139).
Aa
White text reads best on this color (9.54:1).
About this color
#2E3F8B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.128 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.027 away. White text reads best on it, at 9.54:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.19:1 |
| White text | 9.54:1 |
Values
| HEX | #2E3F8B |
| RGB | rgb(46, 63, 139) |
| HSL | hsl(229, 50%, 36%) |
| OKLCH | oklch(39.9% 0.128 270.2) |
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 #2E3F8B | 9.54:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #2E3F8B | 2.19:1 | Fails | Lc 12.2 | Not readable |
| #2E3F8B text on white | 9.54:1 | AAA | Lc 91.8 | Preferred for body text |
| #2E3F8B text on black | 2.19:1 | Fails | Lc -10.6 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2E9FD
oklch(93.5% 0.028 270.4)
-
Step 200
200
#CBD8FD
oklch(88.4% 0.053 270)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5E7CFE
oklch(63.2% 0.195 270.2)
-
Step 600
600
#4760ED
oklch(55.5% 0.213 270.2)
-
Step 700
700
#394ECE
oklch(49% 0.198 270.1)
-
Step 800
800
#2F41A7
oklch(42.7% 0.164 270.2)
-
Step 900
900 (this color)
#2E3F8B
oklch(39.9% 0.128 270.2)
-
Step 950
950
#18224D
oklch(27% 0.08 270.4)
#2E3F8B 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) | #0C4A8E | 0.036 |
| Deuteranopia (no green cones) | #004189 | 0.034 |
| Tritanopia (no blue cones) | #00515E | 0.107 |
| Achromatopsia (no color) | #454545 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2E3F8B
#2E3F8B
oklch(39.9% 0.128 270.2)
- #584500
#584500
oklch(39.9% 0.082 90.8)
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 #2E3F8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Dark Slate Blue #483D8B ΔE 0.038
- Blueberry #464196 ΔE 0.040
- Twilight Blue #0A437A ΔE 0.044
- Light Navy #155084 ΔE 0.053
- Dusk Blue #26538D ΔE 0.055
- Sapphire #2138AB ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.067
Use #2E3F8B 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.