#2A4791
Closest named color: Cobalt (#1E488F). oklch(41.8% 0.127 265.2), rgb(42, 71, 145).
Aa
White text reads best on this color (8.71:1).
About this color
#2A4791 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.127 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.012 away. White text reads best on it, at 8.71:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.40:1 |
| White text | 8.71:1 |
Values
| HEX | #2A4791 |
| RGB | rgb(42, 71, 145) |
| HSL | hsl(223, 55%, 37%) |
| OKLCH | oklch(41.8% 0.127 265.2) |
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 #2A4791 | 8.71:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #2A4791 | 2.40:1 | Fails | Lc 14.4 | Not readable |
| #2A4791 text on white | 8.71:1 | AAA | Lc 89.6 | Fine for body text |
| #2A4791 text on black | 2.40:1 | Fails | Lc -12.7 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#A9C0F2
oklch(80.8% 0.075 265.5)
-
Step 400
400
#7C9EEB
oklch(70.6% 0.12 265.3)
-
Step 500
500
#5C84E5
oklch(63% 0.153 265.4)
-
Step 600
600
#436CD3
oklch(55.7% 0.165 265.1)
-
Step 700
700
#3559B7
oklch(49.1% 0.155 265.3)
-
Step 800
800 (this color)
#2A4791
oklch(41.8% 0.127 265.2)
-
Step 900
900
#273E76
oklch(37.7% 0.1 265.2)
-
Step 950
950
#172545
oklch(27% 0.063 264.7)
#2A4791 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) | #1C5094 | 0.025 |
| Deuteranopia (no green cones) | #00478F | 0.027 |
| Tritanopia (no blue cones) | #005865 | 0.102 |
| Achromatopsia (no color) | #4B4B4B | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4791
#2A4791
oklch(41.8% 0.127 265.2)
- #624800
#624800
oklch(41.8% 0.086 84.9)
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 #2A4791, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.012
- Dusk Blue #26538D ΔE 0.035
- Light Navy #155084 ΔE 0.039
- Blueberry #464196 ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.046
- Twilight Blue #0A437A ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.052
- Sapphire #2138AB ΔE 0.059
Use #2A4791 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.