#2B578E
Closest named color: Dusk Blue (#26538D). oklch(45.4% 0.103 255.2), rgb(43, 87, 142).
Aa
White text reads best on this color (7.35:1).
About this color
#2B578E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.103 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.013 away. White text reads best on it, at 7.35:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.85:1 |
| White text | 7.35:1 |
Values
| HEX | #2B578E |
| RGB | rgb(43, 87, 142) |
| HSL | hsl(213, 54%, 36%) |
| OKLCH | oklch(45.4% 0.103 255.2) |
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 #2B578E | 7.35:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #2B578E | 2.85:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #2B578E text on white | 7.35:1 | AAA | Lc 85.3 | Fine for body text |
| #2B578E text on black | 2.85:1 | Fails | Lc -16.7 | 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
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A7C3E8
oklch(80.9% 0.061 255.5)
-
Step 400
400
#77A3DC
oklch(70.6% 0.097 255.2)
-
Step 500
500
#548BD2
oklch(63% 0.123 255.5)
-
Step 600
600
#3774BF
oklch(55.6% 0.133 255.1)
-
Step 700
700
#2961A5
oklch(49.1% 0.124 255.1)
-
Step 800
800 (this color)
#2B578E
oklch(45.4% 0.103 255.2)
-
Step 900
900
#22426B
oklch(37.6% 0.08 255.5)
-
Step 950
950
#15273F
oklch(27% 0.051 256.1)
#2B578E 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) | #3E5B90 | 0.025 |
| Deuteranopia (no green cones) | #30528D | 0.014 |
| Tritanopia (no blue cones) | #00646B | 0.082 |
| Achromatopsia (no color) | #565656 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B578E
#2B578E
oklch(45.4% 0.103 255.2)
- #754D00
#754D00
oklch(45.4% 0.096 74.8)
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 #2B578E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.013
- Light Navy Blue #2E5A88 ΔE 0.015
- Denim Blue #3B5B92 ΔE 0.023
- Light Navy #155084 ΔE 0.033
- Deep Sea Blue #015482 ΔE 0.034
- Dusky Blue #475F94 ΔE 0.042
- Denim #3B638C ΔE 0.042
- Twilight #4E518B ΔE 0.043
Use #2B578E 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.