#3783AB
Closest named color: Steel Blue (#4682B4). oklch(58% 0.096 234.9), rgb(55, 131, 171).
Aa
Black text reads best on this color (4.99:1).
About this color
#3783AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.096 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.020 away. Black text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.99:1 |
| White text | 4.20:1 |
Values
| HEX | #3783AB |
| RGB | rgb(55, 131, 171) |
| HSL | hsl(201, 51%, 44%) |
| OKLCH | oklch(58% 0.096 234.9) |
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 #3783AB | 4.20:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #3783AB | 4.99:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #3783AB text on white | 4.20:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #3783AB text on black | 4.99:1 | AA | Lc -32.9 | Non-text elements, placeholder text |
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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A6C6D9
oklch(80.9% 0.044 234.1)
-
Step 400
400
#75A8C6
oklch(70.7% 0.07 234.9)
-
Step 500
500
#4F92B7
oklch(63.1% 0.088 234.7)
-
Step 600
600 (this color)
#3783AB
oklch(58% 0.096 234.9)
-
Step 700
700
#20688C
oklch(49% 0.09 235)
-
Step 800
800
#1E5572
oklch(42.7% 0.074 235.5)
-
Step 900
900
#1F465C
oklch(37.6% 0.058 235.9)
-
Step 950
950
#132936
oklch(26.9% 0.037 236.3)
#3783AB 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) | #7082AD | 0.060 |
| Deuteranopia (no green cones) | #6076AA | 0.051 |
| Tritanopia (no blue cones) | #008D90 | 0.063 |
| Achromatopsia (no color) | #7C7C7C | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3783AB
#3783AB
oklch(58% 0.096 234.9)
- #A66A3F
#A66A3F
oklch(58% 0.097 55.1)
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 #3783AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.020
- Blue NCS #118AB2 ΔE 0.024
- Cool Blue #4984B8 ΔE 0.027
- Cerulean #457B9D ΔE 0.028
- Off Blue #5684AE ΔE 0.030
- Stormy Blue #507B9C ΔE 0.032
- Teal Blue #01889F ΔE 0.035
- Dusty Blue #5A86AD ΔE 0.035
Use #3783AB 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.