#2B457D
Closest named color: Twilight Blue (#0A437A). oklch(40% 0.1 263.7), rgb(43, 69, 125).
Aa
White text reads best on this color (9.33:1).
About this color
#2B457D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.100 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 9.33:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.25:1 |
| White text | 9.33:1 |
Values
| HEX | #2B457D |
| RGB | rgb(43, 69, 125) |
| HSL | hsl(221, 49%, 33%) |
| OKLCH | oklch(40% 0.1 263.7) |
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 #2B457D | 9.33:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #2B457D | 2.25:1 | Fails | Lc 12.6 | Not readable |
| #2B457D text on white | 9.33:1 | AAA | Lc 91.3 | Preferred for body text |
| #2B457D text on black | 2.25:1 | Fails | Lc -11.0 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A8C1F2
oklch(80.9% 0.075 263.7)
-
Step 400
400
#7A9FEB
oklch(70.7% 0.119 263.8)
-
Step 500
500
#5885E5
oklch(63% 0.153 263.7)
-
Step 600
600
#3F6DD3
oklch(55.7% 0.165 263.7)
-
Step 700
700
#315AB7
oklch(49.1% 0.155 263.8)
-
Step 800
800
#294A94
oklch(42.7% 0.128 263.8)
-
Step 900
900 (this color)
#2B457D
oklch(40% 0.1 263.7)
-
Step 950
950
#162545
oklch(27% 0.063 263.8)
#2B457D 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) | #2B4B7F | 0.018 |
| Deuteranopia (no green cones) | #1F437C | 0.015 |
| Tritanopia (no blue cones) | #00525B | 0.084 |
| Achromatopsia (no color) | #474747 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B457D
#2B457D
oklch(40% 0.1 263.7)
- #5D4300
#5D4300
oklch(40.1% 0.082 83.4)
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 #2B457D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Cobalt #1E488F ΔE 0.031
- Light Navy #155084 ΔE 0.034
- Dusk Blue #26538D ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.052
- Blueberry #464196 ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.060
Use #2B457D 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.