#2A4799
Closest named color: Cobalt (#1E488F). oklch(42.5% 0.139 266), rgb(42, 71, 153).
Aa
White text reads best on this color (8.53:1).
About this color
#2A4799 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.139 and its hue 266°. 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 8.53:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.45:1 |
| White text | 8.53:1 |
Values
| HEX | #2A4799 |
| RGB | rgb(42, 71, 153) |
| HSL | hsl(224, 57%, 38%) |
| OKLCH | oklch(42.5% 0.139 266) |
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 #2A4799 | 8.53:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #2A4799 | 2.45:1 | Fails | Lc 15.0 | Dividers and decoration only |
| #2A4799 text on white | 8.53:1 | AAA | Lc 89.0 | Fine for body text |
| #2A4799 text on black | 2.45:1 | Fails | Lc -13.2 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBD9F8
oklch(88.5% 0.045 266.2)
-
Step 300
300
#A8C0F6
oklch(80.9% 0.081 266)
-
Step 400
400
#7A9DF1
oklch(70.6% 0.13 266)
-
Step 500
500
#5A83ED
oklch(63.2% 0.165 265.9)
-
Step 600
600
#4169DB
oklch(55.5% 0.18 266.1)
-
Step 700
700
#3357BE
oklch(49.1% 0.167 265.9)
-
Step 800
800 (this color)
#2A4799
oklch(42.5% 0.139 266)
-
Step 900
900
#263D7A
oklch(37.7% 0.108 265.9)
-
Step 950
950
#162448
oklch(26.9% 0.07 265.9)
#2A4799 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) | #0F529C | 0.032 |
| Deuteranopia (no green cones) | #004897 | 0.026 |
| Tritanopia (no blue cones) | #005B69 | 0.112 |
| Achromatopsia (no color) | #4C4C4C | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4799
#2A4799
oklch(42.5% 0.139 266)
- #634A00
#634A00
oklch(42.4% 0.087 86.3)
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 #2A4799, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.021
- Blueberry #464196 ΔE 0.038
- Dusk Blue #26538D ΔE 0.041
- Light Navy #155084 ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.049
- Sapphire #2138AB ΔE 0.049
- Twilight Blue #0A437A ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.061
Use #2A4799 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.