#2A4183
Closest named color: Cobalt (#1E488F). oklch(39.5% 0.114 266.7), rgb(42, 65, 131).
Aa
White text reads best on this color (9.62:1).
About this color
#2A4183 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.114 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.027 away. White text reads best on it, at 9.62:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.18:1 |
| White text | 9.62:1 |
Values
| HEX | #2A4183 |
| RGB | rgb(42, 65, 131) |
| HSL | hsl(224, 51%, 34%) |
| OKLCH | oklch(39.5% 0.114 266.7) |
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 #2A4183 | 9.62:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #2A4183 | 2.18:1 | Fails | Lc 11.9 | Not readable |
| #2A4183 text on white | 9.62:1 | AAA | Lc 92.0 | Preferred for body text |
| #2A4183 text on black | 2.18:1 | Fails | Lc -10.4 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
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
#A7C0F9
oklch(80.9% 0.086 266.1)
-
Step 400
400
#799DF6
oklch(70.8% 0.137 266.3)
-
Step 500
500
#5981F2
oklch(63.1% 0.175 266.7)
-
Step 600
600
#4067E1
oklch(55.5% 0.191 266.7)
-
Step 700
700
#3355C4
oklch(49.2% 0.178 266.7)
-
Step 800
800
#2A469E
oklch(42.6% 0.147 266.7)
-
Step 900
900 (this color)
#2A4183
oklch(39.5% 0.114 266.7)
-
Step 950
950
#162449
oklch(27% 0.071 266.2)
#2A4183 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) | #1E4985 | 0.023 |
| Deuteranopia (no green cones) | #074182 | 0.027 |
| Tritanopia (no blue cones) | #00505B | 0.095 |
| Achromatopsia (no color) | #454545 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4183
#2A4183
oklch(39.5% 0.114 266.7)
- #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 #2A4183, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Twilight Blue #0A437A ΔE 0.031
- Light Navy #155084 ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.046
- Blueberry #464196 ΔE 0.051
- Dusk Blue #26538D ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.057
- Marine Blue #01386A ΔE 0.063
Use #2A4183 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.