#2A4FA3
Closest named color: Dusk Blue (#26538D). oklch(45% 0.143 263.7), rgb(42, 79, 163).
Aa
White text reads best on this color (7.64:1).
About this color
#2A4FA3 is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.143 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.040 away. White text reads best on it, at 7.64:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.74:1 |
| White text | 7.64:1 |
Values
| HEX | #2A4FA3 |
| RGB | rgb(42, 79, 163) |
| HSL | hsl(222, 59%, 40%) |
| OKLCH | oklch(45% 0.143 263.7) |
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 #2A4FA3 | 7.64:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #2A4FA3 | 2.74:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #2A4FA3 text on white | 7.64:1 | AAA | Lc 86.2 | Fine for body text |
| #2A4FA3 text on black | 2.74:1 | Fails | Lc -15.9 | 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
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CADAF9
oklch(88.6% 0.046 263.7)
-
Step 300
300
#A5C1F7
oklch(80.9% 0.083 263.3)
-
Step 400
400
#759EF4
oklch(70.6% 0.134 263.9)
-
Step 500
500
#5284EF
oklch(63.2% 0.17 263.5)
-
Step 600
600
#386ADE
oklch(55.6% 0.186 263.8)
-
Step 700
700
#2B58C1
oklch(49.2% 0.172 263.7)
-
Step 800
800 (this color)
#2A4FA3
oklch(45% 0.143 263.7)
-
Step 900
900
#223E7C
oklch(37.8% 0.111 263.7)
-
Step 950
950
#142548
oklch(27.1% 0.069 263.1)
#2A4FA3 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) | #1B59A6 | 0.027 |
| Deuteranopia (no green cones) | #004EA1 | 0.025 |
| Tritanopia (no blue cones) | #006371 | 0.113 |
| Achromatopsia (no color) | #535353 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4FA3
#2A4FA3
oklch(45% 0.143 263.7)
- #6D5000
#6D5000
oklch(45% 0.092 84.4)
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 #2A4FA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.040
- Cobalt #1E488F ΔE 0.040
- Blueberry #464196 ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.052
- Light Navy #155084 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.059
- Twilight #4E518B ΔE 0.060
- Sapphire #2138AB ΔE 0.061
Use #2A4FA3 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.