#2E3F81
Closest named color: Cobalt (#1E488F). oklch(39.1% 0.113 269.7), rgb(46, 63, 129).
Aa
White text reads best on this color (9.79:1).
About this color
#2E3F81 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.113 and its hue 270°. 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 9.79:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.14:1 |
| White text | 9.79:1 |
Values
| HEX | #2E3F81 |
| RGB | rgb(46, 63, 129) |
| HSL | hsl(228, 47%, 34%) |
| OKLCH | oklch(39.1% 0.113 269.7) |
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 #2E3F81 | 9.79:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #2E3F81 | 2.14:1 | Fails | Lc 11.5 | Not readable |
| #2E3F81 text on white | 9.79:1 | AAA | Lc 92.5 | Preferred for body text |
| #2E3F81 text on black | 2.14:1 | Fails | Lc -10.0 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CDD8F9
oklch(88.4% 0.047 270.8)
-
Step 300
300
#ABBFF8
oklch(81% 0.084 269.5)
-
Step 400
400
#7F9BF5
oklch(70.7% 0.136 269.6)
-
Step 500
500
#617FF1
oklch(63.1% 0.174 269.8)
-
Step 600
600
#4A65DF
oklch(55.5% 0.188 269.8)
-
Step 700
700
#3C53C2
oklch(49.1% 0.175 269.9)
-
Step 800
800
#31459D
oklch(42.7% 0.145 269.6)
-
Step 900
900 (this color)
#2E3F81
oklch(39.1% 0.113 269.7)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#2E3F81 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) | #1C4883 | 0.028 |
| Deuteranopia (no green cones) | #094080 | 0.032 |
| Tritanopia (no blue cones) | #004E5A | 0.095 |
| Achromatopsia (no color) | #444444 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2E3F81
#2E3F81
oklch(39.1% 0.113 269.7)
- #564300
#564300
oklch(39.2% 0.08 90.3)
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 #2E3F81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.033
- Twilight Blue #0A437A ΔE 0.034
- Dark Slate Blue #483D8B ΔE 0.043
- Light Navy #155084 ΔE 0.050
- Blueberry #464196 ΔE 0.051
- Dusk Blue #26538D ΔE 0.057
- Marine Blue #01386A ΔE 0.062
- Deep Sea Blue #015482 ΔE 0.063
Use #2E3F81 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.