#2F406F
Closest named color: Twilight Blue (#0A437A). oklch(38.1% 0.083 267.4), rgb(47, 64, 111).
Aa
White text reads best on this color (10.07:1).
About this color
#2F406F is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.083 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.07:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.08:1 |
| White text | 10.07:1 |
Values
| HEX | #2F406F |
| RGB | rgb(47, 64, 111) |
| HSL | hsl(224, 41%, 31%) |
| OKLCH | oklch(38.1% 0.083 267.4) |
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 #2F406F | 10.07:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #2F406F | 2.08:1 | Fails | Lc 10.7 | Not readable |
| #2F406F text on white | 10.07:1 | AAA | Lc 93.3 | Preferred for body text |
| #2F406F text on black | 2.08:1 | Fails | Lc -9.2 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#AFC0EA
oklch(80.9% 0.062 267.7)
-
Step 400
400
#859FE0
oklch(70.8% 0.1 267.1)
-
Step 500
500
#6785D7
oklch(63.1% 0.129 267.5)
-
Step 600
600
#4F6DC4
oklch(55.5% 0.139 267.4)
-
Step 700
700
#405BA9
oklch(49.1% 0.129 267.2)
-
Step 800
800
#354B89
oklch(42.8% 0.106 267.2)
-
Step 900
900 (this color)
#2F406F
oklch(38.1% 0.083 267.4)
-
Step 950
950
#1B2540
oklch(27% 0.052 267.5)
#2F406F 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) | #2D4571 | 0.015 |
| Deuteranopia (no green cones) | #253F6E | 0.013 |
| Tritanopia (no blue cones) | #0B4A52 | 0.074 |
| Achromatopsia (no color) | #424242 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F406F
#2F406F
oklch(38.1% 0.083 267.4)
- #543F00
#543F00
oklch(38% 0.078 87.2)
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 #2F406F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.044
- Marine Blue #01386A ΔE 0.052
- Light Navy #155084 ΔE 0.054
- Cobalt #1E488F ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.057
- Charcoal #264653 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.062
Use #2F406F 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.