#2F578F
Closest named color: Dusk Blue (#26538D). oklch(45.6% 0.103 257.1), rgb(47, 87, 143).
Aa
White text reads best on this color (7.28:1).
About this color
#2F578F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.103 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.016 away. White text reads best on it, at 7.28:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.88:1 |
| White text | 7.28:1 |
Values
| HEX | #2F578F |
| RGB | rgb(47, 87, 143) |
| HSL | hsl(215, 51%, 37%) |
| OKLCH | oklch(45.6% 0.103 257.1) |
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 #2F578F | 7.28:1 | AAA | Lc -90.0 | Fine for body text |
| Black text on #2F578F | 2.88:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #2F578F text on white | 7.28:1 | AAA | Lc 85.1 | Fine for body text |
| #2F578F text on black | 2.88:1 | Fails | Lc -16.9 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF6
oklch(93.7% 0.017 256.3)
-
Step 200
200
#CCDAF0
oklch(88.5% 0.034 259.4)
-
Step 300
300
#A8C3E8
oklch(81% 0.06 256.3)
-
Step 400
400
#7AA3DC
oklch(70.8% 0.095 256.7)
-
Step 500
500
#578AD3
oklch(63% 0.124 257.4)
-
Step 600
600
#3C73C0
oklch(55.6% 0.134 257.2)
-
Step 700
700
#2E60A5
oklch(49.1% 0.123 257.1)
-
Step 800
800 (this color)
#2F578F
oklch(45.6% 0.103 257.1)
-
Step 900
900
#24426B
oklch(37.7% 0.079 256.6)
-
Step 950
950
#16273F
oklch(27.1% 0.05 257.1)
#2F578F 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) | #3E5B91 | 0.022 |
| Deuteranopia (no green cones) | #30528E | 0.014 |
| Tritanopia (no blue cones) | #00646C | 0.083 |
| Achromatopsia (no color) | #565656 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F578F
#2F578F
oklch(45.6% 0.103 257.1)
- #744F00
#744F00
oklch(45.7% 0.095 77.7)
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 #2F578F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.016
- Light Navy Blue #2E5A88 ΔE 0.016
- Denim Blue #3B5B92 ΔE 0.019
- Light Navy #155084 ΔE 0.036
- Deep Sea Blue #015482 ΔE 0.038
- Dusky Blue #475F94 ΔE 0.039
- Twilight #4E518B ΔE 0.040
- Denim #3B638C ΔE 0.041
Use #2F578F 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.