#2F4579
Closest named color: Twilight Blue (#0A437A). oklch(40% 0.092 265.2), rgb(47, 69, 121).
Aa
White text reads best on this color (9.34:1).
About this color
#2F4579 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.092 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.033 away. White text reads best on it, at 9.34:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.24:1 |
| White text | 9.34:1 |
Values
| HEX | #2F4579 |
| RGB | rgb(47, 69, 121) |
| HSL | hsl(222, 44%, 33%) |
| OKLCH | oklch(40% 0.092 265.2) |
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 #2F4579 | 9.34:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #2F4579 | 2.24:1 | Fails | Lc 12.6 | Not readable |
| #2F4579 text on white | 9.34:1 | AAA | Lc 91.4 | Preferred for body text |
| #2F4579 text on black | 2.24:1 | Fails | Lc -11.0 | Not readable |
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 900.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F3
oklch(88.4% 0.038 265.8)
-
Step 300
300
#ABC1EE
oklch(81% 0.068 264.5)
-
Step 400
400
#7F9FE6
oklch(70.7% 0.111 265.2)
-
Step 500
500
#5F85DF
oklch(63.1% 0.142 265.3)
-
Step 600
600
#476DCC
oklch(55.6% 0.153 265.3)
-
Step 700
700
#385BB1
oklch(49.2% 0.143 265)
-
Step 800
800
#2F4A8F
oklch(42.6% 0.119 265.6)
-
Step 900
900 (this color)
#2F4579
oklch(40% 0.092 265.2)
-
Step 950
950
#182543
oklch(27% 0.059 265)
#2F4579 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) | #2E4A7B | 0.015 |
| Deuteranopia (no green cones) | #254478 | 0.013 |
| Tritanopia (no blue cones) | #005159 | 0.082 |
| Achromatopsia (no color) | #474747 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F4579
#2F4579
oklch(40% 0.092 265.2)
- #5C4300
#5C4300
oklch(39.9% 0.082 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 #2F4579, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.033
- Light Navy #155084 ΔE 0.037
- Cobalt #1E488F ΔE 0.039
- Dusk Blue #26538D ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.054
- Blueberry #464196 ΔE 0.061
Use #2F4579 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.