#2B4E9F
Closest named color: Cobalt (#1E488F). oklch(44.5% 0.138 264), rgb(43, 78, 159).
Aa
White text reads best on this color (7.79:1).
About this color
#2B4E9F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.138 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.034 away. White text reads best on it, at 7.79:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.69:1 |
| White text | 7.79:1 |
Values
| HEX | #2B4E9F |
| RGB | rgb(43, 78, 159) |
| HSL | hsl(222, 57%, 40%) |
| OKLCH | oklch(44.5% 0.138 264) |
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 #2B4E9F | 7.79:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #2B4E9F | 2.69:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #2B4E9F text on white | 7.79:1 | AAA | Lc 86.7 | Fine for body text |
| #2B4E9F text on black | 2.69:1 | Fails | Lc -15.4 | Dividers and decoration only |
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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF8
oklch(88.6% 0.045 263.1)
-
Step 300
300
#A6C1F6
oklch(81% 0.081 263.6)
-
Step 400
400
#779EF1
oklch(70.6% 0.13 264.2)
-
Step 500
500
#5584EC
oklch(63.1% 0.165 264)
-
Step 600
600
#3B6BDA
oklch(55.6% 0.178 263.9)
-
Step 700
700
#2E58BE
oklch(49.1% 0.167 264.2)
-
Step 800
800 (this color)
#2B4E9F
oklch(44.5% 0.138 264)
-
Step 900
900
#233E7A
oklch(37.7% 0.107 263.8)
-
Step 950
950
#152547
oklch(27.1% 0.067 263.6)
#2B4E9F 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) | #1E58A2 | 0.027 |
| Deuteranopia (no green cones) | #004D9D | 0.026 |
| Tritanopia (no blue cones) | #00616F | 0.109 |
| Achromatopsia (no color) | #525252 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4E9F
#2B4E9F
oklch(44.5% 0.138 264)
- #6B4F00
#6B4F00
oklch(44.5% 0.091 85)
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 #2B4E9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.034
- Dusk Blue #26538D ΔE 0.035
- Blueberry #464196 ΔE 0.045
- Light Navy #155084 ΔE 0.050
- Denim Blue #3B5B92 ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.056
- Twilight #4E518B ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.059
Use #2B4E9F 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.