#434F99
Closest named color: Twilight (#4E518B). oklch(45.6% 0.12 273.7), rgb(67, 79, 153).
Aa
White text reads best on this color (7.45:1).
About this color
#434F99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.120 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.029 away. White text reads best on it, at 7.45:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.81:1 |
| White text | 7.45:1 |
Values
| HEX | #434F99 |
| RGB | rgb(67, 79, 153) |
| HSL | hsl(232, 39%, 43%) |
| OKLCH | oklch(45.6% 0.12 273.7) |
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 #434F99 | 7.45:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #434F99 | 2.81:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #434F99 text on white | 7.45:1 | AAA | Lc 85.7 | Fine for body text |
| #434F99 text on black | 2.81:1 | Fails | Lc -16.3 | Dividers and decoration only |
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
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D1D8F4
oklch(88.6% 0.039 274.4)
-
Step 300
300
#B2BEEF
oklch(80.9% 0.071 274)
-
Step 400
400
#8A9BE7
oklch(70.7% 0.113 273.6)
-
Step 500
500
#6F80DF
oklch(63% 0.144 273.9)
-
Step 600
600
#5868CD
oklch(55.6% 0.156 273.5)
-
Step 700
700
#4956B2
oklch(49.2% 0.145 273.8)
-
Step 800
800 (this color)
#434F99
oklch(45.6% 0.12 273.7)
-
Step 900
900
#333C73
oklch(37.8% 0.094 274)
-
Step 950
950
#1D2343
oklch(26.8% 0.06 273.7)
#434F99 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) | #2C599C | 0.034 |
| Deuteranopia (no green cones) | #215297 | 0.037 |
| Tritanopia (no blue cones) | #155F6C | 0.107 |
| Achromatopsia (no color) | #555555 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #434F99
#434F99
oklch(45.6% 0.12 273.7)
- #685500
#685500
oklch(45.5% 0.093 93.9)
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 #434F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.029
- Blueberry #464196 ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.038
- Dusk Blue #26538D ΔE 0.040
- Dusk #4E5481 ΔE 0.047
- Dusky Blue #475F94 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.051
Use #434F99 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.