#2A4287
Closest named color: Cobalt (#1E488F). oklch(40% 0.119 266.6), rgb(42, 66, 135).
Aa
White text reads best on this color (9.42:1).
About this color
#2A4287 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.119 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.021 away. White text reads best on it, at 9.42:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.22:1 |
| White text | 9.42:1 |
Values
| HEX | #2A4287 |
| RGB | rgb(42, 66, 135) |
| HSL | hsl(225, 53%, 35%) |
| OKLCH | oklch(40% 0.119 266.6) |
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 #2A4287 | 9.42:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #2A4287 | 2.22:1 | Fails | Lc 12.5 | Not readable |
| #2A4287 text on white | 9.42:1 | AAA | Lc 91.5 | Preferred for body text |
| #2A4287 text on black | 2.22:1 | Fails | Lc -10.9 | 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
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A6C0FB
oklch(81% 0.089 266)
-
Step 400
400
#789CF9
oklch(70.7% 0.142 266.8)
-
Step 500
500
#5780F6
oklch(63.1% 0.182 266.7)
-
Step 600
600
#3E66E5
oklch(55.6% 0.198 266.6)
-
Step 700
700
#3154C7
oklch(49.1% 0.184 266.6)
-
Step 800
800
#2945A1
oklch(42.6% 0.153 266.8)
-
Step 900
900 (this color)
#2A4287
oklch(40% 0.119 266.6)
-
Step 950
950
#15234B
oklch(26.9% 0.076 266.7)
#2A4287 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) | #1B4B8A | 0.026 |
| Deuteranopia (no green cones) | #014286 | 0.029 |
| Tritanopia (no blue cones) | #00525E | 0.098 |
| Achromatopsia (no color) | #464646 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4287
#2A4287
oklch(40% 0.119 266.6)
- #5B4400
#5B4400
oklch(40% 0.082 86.6)
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 #2A4287, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.021
- Twilight Blue #0A437A ΔE 0.035
- Light Navy #155084 ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.044
- Blueberry #464196 ΔE 0.047
- Dusk Blue #26538D ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.056
- Sapphire #2138AB ΔE 0.066
Use #2A4287 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.