#2A5591
Closest named color: Dusk Blue (#26538D). oklch(45% 0.11 257.2), rgb(42, 85, 145).
Aa
White text reads best on this color (7.48:1).
About this color
#2A5591 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.110 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.010 away. White text reads best on it, at 7.48:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.80:1 |
| White text | 7.48:1 |
Values
| HEX | #2A5591 |
| RGB | rgb(42, 85, 145) |
| HSL | hsl(215, 55%, 37%) |
| OKLCH | oklch(45% 0.11 257.2) |
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 #2A5591 | 7.48:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #2A5591 | 2.80:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #2A5591 text on white | 7.48:1 | AAA | Lc 85.7 | Fine for body text |
| #2A5591 text on black | 2.80:1 | Fails | Lc -16.3 | 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
#CBDBF1
oklch(88.6% 0.035 256.3)
-
Step 300
300
#A7C3EA
oklch(81% 0.063 256.7)
-
Step 400
400
#77A2E0
oklch(70.6% 0.103 257.5)
-
Step 500
500
#538AD7
oklch(63.1% 0.131 257.1)
-
Step 600
600
#3772C5
oklch(55.5% 0.143 257.4)
-
Step 700
700
#2960AA
oklch(49.2% 0.132 256.9)
-
Step 800
800 (this color)
#2A5591
oklch(45% 0.11 257.2)
-
Step 900
900
#22426E
oklch(37.8% 0.085 256.8)
-
Step 950
950
#142740
oklch(27% 0.053 255.8)
#2A5591 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) | #395A93 | 0.023 |
| Deuteranopia (no green cones) | #295090 | 0.015 |
| Tritanopia (no blue cones) | #00636C | 0.087 |
| Achromatopsia (no color) | #555555 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A5591
#2A5591
oklch(45% 0.11 257.2)
- #724D00
#724D00
oklch(45% 0.094 77)
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 #2A5591, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.010
- Light Navy Blue #2E5A88 ΔE 0.024
- Denim Blue #3B5B92 ΔE 0.027
- Light Navy #155084 ΔE 0.031
- Deep Sea Blue #015482 ΔE 0.036
- Cobalt #1E488F ΔE 0.041
- Twilight #4E518B ΔE 0.044
- Dusky Blue #475F94 ΔE 0.047
Use #2A5591 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.