#2B4089
Closest named color: Cobalt (#1E488F). oklch(39.8% 0.124 268.2), rgb(43, 64, 137).
Aa
White text reads best on this color (9.55:1).
About this color
#2B4089 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.124 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.024 away. White text reads best on it, at 9.55:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.19:1 |
| White text | 9.55:1 |
Values
| HEX | #2B4089 |
| RGB | rgb(43, 64, 137) |
| HSL | hsl(227, 52%, 35%) |
| OKLCH | oklch(39.8% 0.124 268.2) |
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 #2B4089 | 9.55:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #2B4089 | 2.19:1 | Fails | Lc 12.2 | Not readable |
| #2B4089 text on white | 9.55:1 | AAA | Lc 91.8 | Preferred for body text |
| #2B4089 text on black | 2.19:1 | Fails | Lc -10.6 | 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
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CAD9FC
oklch(88.5% 0.051 267)
-
Step 300
300
#A7BFFE
oklch(81% 0.093 268.2)
-
Step 400
400
#799BFD
oklch(70.7% 0.149 268)
-
Step 500
500
#597EFB
oklch(63.1% 0.19 268.1)
-
Step 600
600
#4263EA
oklch(55.6% 0.207 268.3)
-
Step 700
700
#3451CC
oklch(49.1% 0.193 268.1)
-
Step 800
800
#2B43A5
oklch(42.7% 0.16 268.2)
-
Step 900
900 (this color)
#2B4089
oklch(39.8% 0.124 268.2)
-
Step 950
950
#16234C
oklch(27% 0.078 267.7)
#2B4089 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) | #134A8C | 0.031 |
| Deuteranopia (no green cones) | #004188 | 0.031 |
| Tritanopia (no blue cones) | #00515E | 0.102 |
| Achromatopsia (no color) | #454545 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4089
#2B4089
oklch(39.8% 0.124 268.2)
- #594400
#594400
oklch(39.8% 0.081 88.6)
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 #2B4089, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Twilight Blue #0A437A ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.042
- Blueberry #464196 ΔE 0.045
- Light Navy #155084 ΔE 0.048
- Dusk Blue #26538D ΔE 0.053
- Sapphire #2138AB ΔE 0.061
- Deep Sea Blue #015482 ΔE 0.063
Use #2B4089 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.