#2E3F8F
Closest named color: Cobalt (#1E488F). oklch(40.2% 0.134 270.3), rgb(46, 63, 143).
Aa
White text reads best on this color (9.44:1).
About this color
#2E3F8F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.134 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 9.44:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.22:1 |
| White text | 9.44:1 |
Values
| HEX | #2E3F8F |
| RGB | rgb(46, 63, 143) |
| HSL | hsl(229, 51%, 37%) |
| OKLCH | oklch(40.2% 0.134 270.3) |
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 #2E3F8F | 9.44:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #2E3F8F | 2.22:1 | Fails | Lc 12.5 | Not readable |
| #2E3F8F text on white | 9.44:1 | AAA | Lc 91.5 | Preferred for body text |
| #2E3F8F text on black | 2.22:1 | Fails | Lc -10.9 | 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
#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
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5E7BFF
oklch(63.1% 0.198 270.4)
-
Step 600
600
#465EF3
oklch(55.6% 0.223 270.3)
-
Step 700
700
#394CD3
oklch(49.1% 0.207 270.4)
-
Step 800
800
#2E40AB
oklch(42.8% 0.171 270.1)
-
Step 900
900 (this color)
#2E3F8F
oklch(40.2% 0.134 270.3)
-
Step 950
950
#17224F
oklch(27.1% 0.084 269.7)
#2E3F8F 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) | #014B92 | 0.040 |
| Deuteranopia (no green cones) | #00428D | 0.034 |
| Tritanopia (no blue cones) | #005260 | 0.111 |
| Achromatopsia (no color) | #464646 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2E3F8F
#2E3F8F
oklch(40.2% 0.134 270.3)
- #594600
#594600
oklch(40.3% 0.082 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 #2E3F8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Blueberry #464196 ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.039
- Twilight Blue #0A437A ΔE 0.049
- Sapphire #2138AB ΔE 0.051
- Light Navy #155084 ΔE 0.055
- Dusk Blue #26538D ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.069
Use #2E3F8F 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.