#434F7B
Closest named color: Dusk (#4E5481). oklch(43.8% 0.074 271.4), rgb(67, 79, 123).
Aa
White text reads best on this color (7.94:1).
About this color
#434F7B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.074 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.024 away. White text reads best on it, at 7.94:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.64:1 |
| White text | 7.94:1 |
Values
| HEX | #434F7B |
| RGB | rgb(67, 79, 123) |
| HSL | hsl(227, 29%, 37%) |
| OKLCH | oklch(43.8% 0.074 271.4) |
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 #434F7B | 7.94:1 | AAA | Lc -92.2 | Preferred for body text |
| Black text on #434F7B | 2.64:1 | Fails | Lc 16.5 | Dividers and decoration only |
| #434F7B text on white | 7.94:1 | AAA | Lc 87.5 | Fine for body text |
| #434F7B text on black | 2.64:1 | Fails | Lc -14.6 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7EAF3
oklch(93.7% 0.013 271.3)
-
Step 200
200
#D3D9EA
oklch(88.6% 0.024 270.3)
-
Step 300
300
#B6C0DE
oklch(81% 0.044 270.8)
-
Step 400
400
#919FCD
oklch(70.8% 0.069 271.4)
-
Step 500
500
#7686C0
oklch(63.1% 0.09 271.8)
-
Step 600
600
#5F6FAC
oklch(55.5% 0.097 271.8)
-
Step 700
700
#4E5D94
oklch(49.1% 0.09 271.2)
-
Step 800
800 (this color)
#434F7B
oklch(43.8% 0.074 271.4)
-
Step 900
900
#364061
oklch(37.8% 0.058 270.6)
-
Step 950
950
#202539
oklch(26.9% 0.038 272.9)
#434F7B 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) | #3F537D | 0.012 |
| Deuteranopia (no green cones) | #3A4F7A | 0.012 |
| Tritanopia (no blue cones) | #30585F | 0.066 |
| Achromatopsia (no color) | #515151 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #434F7B
#434F7B
oklch(43.8% 0.074 271.4)
- #61501A
#61501A
oklch(43.7% 0.075 91.3)
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 #434F7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.024
- Twilight #4E518B ΔE 0.032
- YInMn Blue #415A77 ΔE 0.036
- Light Navy Blue #2E5A88 ΔE 0.039
- Dusty Grape #545775 ΔE 0.040
- Dusk Blue #26538D ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.045
- Light Navy #155084 ΔE 0.047
Use #434F7B 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.