#2F478B
Closest named color: Cobalt (#1E488F). oklch(41.7% 0.117 266.7), rgb(47, 71, 139).
Aa
White text reads best on this color (8.76:1).
About this color
#2F478B is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.117 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.017 away. White text reads best on it, at 8.76:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.39:1 |
| White text | 8.76:1 |
Values
| HEX | #2F478B |
| RGB | rgb(47, 71, 139) |
| HSL | hsl(224, 49%, 36%) |
| OKLCH | oklch(41.7% 0.117 266.7) |
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 #2F478B | 8.76:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #2F478B | 2.39:1 | Fails | Lc 14.2 | Not readable |
| #2F478B text on white | 8.76:1 | AAA | Lc 89.8 | Fine for body text |
| #2F478B text on black | 2.39:1 | Fails | Lc -12.5 | 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 800.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F3
oklch(88.5% 0.038 267.3)
-
Step 300
300
#ADC0EE
oklch(80.9% 0.069 267.3)
-
Step 400
400
#829EE5
oklch(70.7% 0.109 267.2)
-
Step 500
500
#6385DD
oklch(63.2% 0.138 266.6)
-
Step 600
600
#4B6CCB
oklch(55.5% 0.152 267)
-
Step 700
700
#3C5AB0
oklch(49.1% 0.141 266.7)
-
Step 800
800 (this color)
#2F478B
oklch(41.7% 0.117 266.7)
-
Step 900
900
#2B3E72
oklch(37.6% 0.092 266.9)
-
Step 950
950
#192542
oklch(27% 0.057 265.8)
#2F478B 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) | #244F8E | 0.023 |
| Deuteranopia (no green cones) | #11478A | 0.026 |
| Tritanopia (no blue cones) | #005762 | 0.098 |
| Achromatopsia (no color) | #4B4B4B | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F478B
#2F478B
oklch(41.7% 0.117 266.7)
- #604800
#604800
oklch(41.6% 0.085 86.7)
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 #2F478B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Dusk Blue #26538D ΔE 0.034
- Light Navy #155084 ΔE 0.035
- Blueberry #464196 ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.041
- Twilight Blue #0A437A ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.049
- Twilight #4E518B ΔE 0.054
Use #2F478B 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.