#43789C
Closest named color: Cerulean (#457B9D). oklch(55.1% 0.08 240.1), rgb(67, 120, 156).
Aa
White text reads best on this color (4.76:1).
About this color
#43789C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.080 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.009 away. White text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.40:1 |
| White text | 4.76:1 |
Values
| HEX | #43789C |
| RGB | rgb(67, 120, 156) |
| HSL | hsl(204, 40%, 44%) |
| OKLCH | oklch(55.1% 0.08 240.1) |
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 #43789C | 4.76:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #43789C | 4.40:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #43789C text on white | 4.76:1 | AA | Lc 72.9 | Content text, not long reading |
| #43789C text on black | 4.40:1 | AA large text | Lc -28.7 | 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 600.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CEDBE5
oklch(88.5% 0.02 240.8)
-
Step 300
300
#ADC4D6
oklch(80.9% 0.036 241.6)
-
Step 400
400
#80A6C1
oklch(70.7% 0.057 239.5)
-
Step 500
500
#5F90B2
oklch(63.2% 0.074 239.7)
-
Step 600
600 (this color)
#43789C
oklch(55.1% 0.08 240.1)
-
Step 700
700
#366687
oklch(49.1% 0.075 240.6)
-
Step 800
800
#2D536D
oklch(42.6% 0.061 240.2)
-
Step 900
900
#294559
oklch(37.7% 0.048 240.8)
-
Step 950
950
#182834
oklch(26.8% 0.031 241.7)
#43789C 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) | #68789E | 0.044 |
| Deuteranopia (no green cones) | #5C6F9B | 0.036 |
| Tritanopia (no blue cones) | #008184 | 0.064 |
| Achromatopsia (no color) | #737373 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #43789C
#43789C
oklch(55.1% 0.08 240.1)
- #946640
#946640
oklch(55% 0.08 59.6)
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 #43789C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.009
- Dull Blue #49759C ΔE 0.010
- Stormy Blue #507B9C ΔE 0.017
- Metallic Blue #4F738E ΔE 0.024
- Muted Blue #3B719F ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.028
- Nice Blue #107AB0 ΔE 0.040
- Ocean #017B92 ΔE 0.041
Use #43789C 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.