#434C8B
Closest named color: Twilight (#4E518B). oklch(44.1% 0.103 275.2), rgb(67, 76, 139).
Aa
White text reads best on this color (7.93:1).
About this color
#434C8B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.103 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.023 away. White text reads best on it, at 7.93:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.64:1 |
| White text | 7.93:1 |
Values
| HEX | #434C8B |
| RGB | rgb(67, 76, 139) |
| HSL | hsl(233, 35%, 40%) |
| OKLCH | oklch(44.1% 0.103 275.2) |
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 #434C8B | 7.93:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #434C8B | 2.64:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #434C8B text on white | 7.93:1 | AAA | Lc 87.4 | Fine for body text |
| #434C8B text on black | 2.64:1 | Fails | Lc -14.7 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F0
oklch(88.5% 0.034 274.5)
-
Step 300
300
#B5BEE8
oklch(80.9% 0.06 275.5)
-
Step 400
400
#8F9CDD
oklch(70.8% 0.096 275)
-
Step 500
500
#7482D4
oklch(63.1% 0.124 274.9)
-
Step 600
600
#5E6AC1
oklch(55.6% 0.135 275.2)
-
Step 700
700
#4E58A6
oklch(49.1% 0.124 275.4)
-
Step 800
800 (this color)
#434C8B
oklch(44.1% 0.103 275.2)
-
Step 900
900
#363D6C
oklch(37.8% 0.081 275.5)
-
Step 950
950
#1F243F
oklch(27% 0.051 274.5)
#434C8B 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) | #32548D | 0.028 |
| Deuteranopia (no green cones) | #2B4E8A | 0.029 |
| Tritanopia (no blue cones) | #255964 | 0.092 |
| Achromatopsia (no color) | #515151 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #434C8B
#434C8B
oklch(44.1% 0.103 275.2)
- #625100
#625100
oklch(43.9% 0.09 95)
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 #434C8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.023
- Dusk Blue #26538D ΔE 0.036
- Dusk #4E5481 ΔE 0.036
- Blueberry #464196 ΔE 0.036
- Dark Slate Blue #483D8B ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.046
- Cobalt #1E488F ΔE 0.046
Use #434C8B 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.