#424B7F
Closest named color: Twilight (#4E518B). oklch(43% 0.087 274.7), rgb(66, 75, 127).
Aa
White text reads best on this color (8.25:1).
About this color
#424B7F is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.087 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.031 away. White text reads best on it, at 8.25:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.54:1 |
| White text | 8.25:1 |
Values
| HEX | #424B7F |
| RGB | rgb(66, 75, 127) |
| HSL | hsl(231, 32%, 38%) |
| OKLCH | oklch(43% 0.087 274.7) |
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 #424B7F | 8.25:1 | AAA | Lc -93.0 | Preferred for body text |
| Black text on #424B7F | 2.54:1 | Fails | Lc 15.6 | Dividers and decoration only |
| #424B7F text on white | 8.25:1 | AAA | Lc 88.4 | Fine for body text |
| #424B7F text on black | 2.54:1 | Fails | Lc -13.8 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D3D8EC
oklch(88.4% 0.028 274.6)
-
Step 300
300
#B6BFE2
oklch(80.9% 0.05 273.9)
-
Step 400
400
#919DD4
oklch(70.7% 0.082 274.6)
-
Step 500
500
#7784C8
oklch(63.1% 0.104 274.8)
-
Step 600
600
#606DB5
oklch(55.7% 0.113 274.4)
-
Step 700
700
#505A9B
oklch(49% 0.104 275.3)
-
Step 800
800 (this color)
#424B7F
oklch(43% 0.087 274.7)
-
Step 900
900
#373E65
oklch(37.6% 0.067 275)
-
Step 950
950
#20253B
oklch(27.1% 0.042 273.5)
#424B7F 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) | #385181 | 0.020 |
| Deuteranopia (no green cones) | #324C7E | 0.021 |
| Tritanopia (no blue cones) | #2C565F | 0.077 |
| Achromatopsia (no color) | #4F4F4F | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424B7F
#424B7F
oklch(43% 0.087 274.7)
- #5F4F03
#5F4F03
oklch(43.1% 0.087 95.3)
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 #424B7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.031
- Dusk #4E5481 ΔE 0.033
- Dusk Blue #26538D ΔE 0.040
- Light Navy #155084 ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.050
- Blueberry #464196 ΔE 0.050
Use #424B7F 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.