#2B4184
Closest named color: Cobalt (#1E488F). oklch(39.6% 0.116 267.3), rgb(43, 65, 132).
Aa
White text reads best on this color (9.58:1).
About this color
#2B4184 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.116 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.026 away. White text reads best on it, at 9.58:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.19:1 |
| White text | 9.58:1 |
Values
| HEX | #2B4184 |
| RGB | rgb(43, 65, 132) |
| HSL | hsl(225, 51%, 34%) |
| OKLCH | oklch(39.6% 0.116 267.3) |
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 #2B4184 | 9.58:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #2B4184 | 2.19:1 | Fails | Lc 12.0 | Not readable |
| #2B4184 text on white | 9.58:1 | AAA | Lc 91.9 | Preferred for body text |
| #2B4184 text on black | 2.19:1 | Fails | Lc -10.5 | 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 900.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9FA
oklch(88.5% 0.048 267.2)
-
Step 300
300
#A8BFFA
oklch(80.9% 0.088 267.9)
-
Step 400
400
#7A9CF7
oklch(70.7% 0.139 267.3)
-
Step 500
500
#5A80F3
oklch(63% 0.177 267.4)
-
Step 600
600
#4266E2
oklch(55.5% 0.193 267.5)
-
Step 700
700
#3454C4
oklch(49% 0.179 267.3)
-
Step 800
800
#2B469F
oklch(42.8% 0.148 267.1)
-
Step 900
900 (this color)
#2B4184
oklch(39.6% 0.116 267.3)
-
Step 950
950
#16244A
oklch(27.1% 0.073 266.4)
#2B4184 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) | #1D4986 | 0.024 |
| Deuteranopia (no green cones) | #064183 | 0.029 |
| Tritanopia (no blue cones) | #00515C | 0.097 |
| Achromatopsia (no color) | #454545 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4184
#2B4184
oklch(39.6% 0.116 267.3)
- #594300
#594300
oklch(39.6% 0.081 87.3)
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 #2B4184, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.026
- Twilight Blue #0A437A ΔE 0.033
- Light Navy #155084 ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.044
- Blueberry #464196 ΔE 0.049
- Dusk Blue #26538D ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.058
- Marine Blue #01386A ΔE 0.065
Use #2B4184 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.