#2B3981
Closest named color: Twilight Blue (#0A437A). oklch(37.6% 0.122 271.1), rgb(43, 57, 129).
Aa
White text reads best on this color (10.47:1).
About this color
#2B3981 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.122 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.039 away. White text reads best on it, at 10.47:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.47:1 |
Values
| HEX | #2B3981 |
| RGB | rgb(43, 57, 129) |
| HSL | hsl(230, 50%, 34%) |
| OKLCH | oklch(37.6% 0.122 271.1) |
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 #2B3981 | 10.47:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #2B3981 | 2.00:1 | Fails | Lc 9.9 | Not readable |
| #2B3981 text on white | 10.47:1 | AAA | Lc 94.0 | Preferred for body text |
| #2B3981 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CCD8FC
oklch(88.5% 0.051 270.8)
-
Step 300
300
#ABBEFD
oklch(81% 0.092 271.3)
-
Step 400
400
#7F99FB
oklch(70.6% 0.146 271)
-
Step 500
500
#627CF9
oklch(63.1% 0.188 271.2)
-
Step 600
600
#4B61E8
oklch(55.5% 0.204 271.1)
-
Step 700
700
#3D50CA
oklch(49.2% 0.189 270.9)
-
Step 800
800
#3242A3
oklch(42.7% 0.157 271)
-
Step 900
900 (this color)
#2B3981
oklch(37.6% 0.122 271.1)
-
Step 950
950
#19224C
oklch(27% 0.078 271.2)
#2B3981 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) | #064384 | 0.036 |
| Deuteranopia (no green cones) | #003C80 | 0.034 |
| Tritanopia (no blue cones) | #004A57 | 0.102 |
| Achromatopsia (no color) | #3F3F3F | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3981
#2B3981
oklch(37.6% 0.122 271.1)
- #513F00
#513F00
oklch(37.6% 0.077 90.4)
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 #2B3981, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.039
- Cobalt #1E488F ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.050
- Marine Blue #01386A ΔE 0.056
- Blueberry #464196 ΔE 0.059
- Light Navy #155084 ΔE 0.065
- Sapphire #2138AB ΔE 0.070
- Dusk Blue #26538D ΔE 0.073
Use #2B3981 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.