#2B3D9F
Closest named color: Sapphire (#2138AB). oklch(41% 0.16 269.8), rgb(43, 61, 159).
Aa
White text reads best on this color (9.24:1).
About this color
#2B3D9F is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.160 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.026 away. White text reads best on it, at 9.24:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.27:1 |
| White text | 9.24:1 |
Values
| HEX | #2B3D9F |
| RGB | rgb(43, 61, 159) |
| HSL | hsl(231, 57%, 40%) |
| OKLCH | oklch(41% 0.16 269.8) |
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 #2B3D9F | 9.24:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #2B3D9F | 2.27:1 | Fails | Lc 13.2 | Not readable |
| #2B3D9F text on white | 9.24:1 | AAA | Lc 90.8 | Preferred for body text |
| #2B3D9F text on black | 2.27:1 | Fails | Lc -11.5 | 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 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFD
oklch(93.7% 0.027 269.7)
-
Step 200
200
#CBD8FC
oklch(88.4% 0.052 269.6)
-
Step 300
300
#A9BEFE
oklch(80.9% 0.094 270.2)
-
Step 400
400
#7C9AFD
oklch(70.7% 0.149 269.6)
-
Step 500
500
#5E7DFB
oklch(63.2% 0.19 269.8)
-
Step 600
600
#4762EA
oklch(55.6% 0.207 269.8)
-
Step 700
700
#3950CC
oklch(49.2% 0.193 269.7)
-
Step 800
800 (this color)
#2B3D9F
oklch(41% 0.16 269.8)
-
Step 900
900
#293982
oklch(37.6% 0.124 270.1)
-
Step 950
950
#18224C
oklch(26.9% 0.079 270.3)
#2B3D9F 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) | #004DA2 | 0.043 |
| Deuteranopia (no green cones) | #00429D | 0.030 |
| Tritanopia (no blue cones) | #005668 | 0.127 |
| Achromatopsia (no color) | #474747 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3D9F
#2B3D9F
oklch(41% 0.16 269.8)
- #5C4700
#5C4700
oklch(40.9% 0.084 89.3)
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 #2B3D9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.026
- Cobalt #1E488F ΔE 0.041
- Blueberry #464196 ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.053
- Blue Blue #2242C7 ΔE 0.066
- Indigo Blue #3A18B1 ΔE 0.067
- Dusk Blue #26538D ΔE 0.068
- Twilight Blue #0A437A ΔE 0.071
Use #2B3D9F 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.