#2A538F
Closest named color: Dusk Blue (#26538D). oklch(44.4% 0.109 258), rgb(42, 83, 143).
Aa
White text reads best on this color (7.68:1).
About this color
#2A538F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.109 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.005 away. White text reads best on it, at 7.68:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.73:1 |
| White text | 7.68:1 |
Values
| HEX | #2A538F |
| RGB | rgb(42, 83, 143) |
| HSL | hsl(216, 55%, 36%) |
| OKLCH | oklch(44.4% 0.109 258) |
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 #2A538F | 7.68:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #2A538F | 2.73:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #2A538F text on white | 7.68:1 | AAA | Lc 86.4 | Fine for body text |
| #2A538F text on black | 2.73:1 | Fails | Lc -15.6 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A7C2EA
oklch(80.8% 0.064 258.1)
-
Step 400
400
#78A2E0
oklch(70.7% 0.102 258)
-
Step 500
500
#558AD7
oklch(63.1% 0.13 257.7)
-
Step 600
600
#3972C5
oklch(55.6% 0.142 258)
-
Step 700
700
#2C5FAA
oklch(49.1% 0.132 258.2)
-
Step 800
800 (this color)
#2A538F
oklch(44.4% 0.109 258)
-
Step 900
900
#23416E
oklch(37.6% 0.085 258.3)
-
Step 950
950
#152740
oklch(27.1% 0.053 256.9)
#2A538F 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) | #375891 | 0.022 |
| Deuteranopia (no green cones) | #274F8E | 0.012 |
| Tritanopia (no blue cones) | #00616A | 0.087 |
| Achromatopsia (no color) | #535353 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A538F
#2A538F
oklch(44.4% 0.109 258)
- #6F4C00
#6F4C00
oklch(44.4% 0.092 78.3)
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 #2A538F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.005
- Light Navy Blue #2E5A88 ΔE 0.027
- Light Navy #155084 ΔE 0.027
- Denim Blue #3B5B92 ΔE 0.032
- Deep Sea Blue #015482 ΔE 0.034
- Cobalt #1E488F ΔE 0.035
- Twilight #4E518B ΔE 0.044
- Dusk #4E5481 ΔE 0.049
Use #2A538F 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.