#3983A4
Closest named color: Cerulean (#457B9D). oklch(57.7% 0.089 230.3), rgb(57, 131, 164).
Aa
Black text reads best on this color (4.95:1).
About this color
#3983A4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.089 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.023 away. Black text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #3983A4 |
| RGB | rgb(57, 131, 164) |
| HSL | hsl(199, 48%, 43%) |
| OKLCH | oklch(57.7% 0.089 230.3) |
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 #3983A4 | 4.23:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #3983A4 | 4.95:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #3983A4 text on white | 4.23:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #3983A4 text on black | 4.95:1 | AA | Lc -32.6 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2EBF0
oklch(93.5% 0.012 231.7)
-
Step 200
200
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A7C6D6
oklch(80.9% 0.04 230.3)
-
Step 400
400
#77A8C1
oklch(70.6% 0.064 231)
-
Step 500
500
#5193B2
oklch(63.2% 0.082 230.3)
-
Step 600
600 (this color)
#3983A4
oklch(57.7% 0.089 230.3)
-
Step 700
700
#236987
oklch(49.1% 0.083 230.5)
-
Step 800
800
#20566D
oklch(42.8% 0.068 229.5)
-
Step 900
900
#204758
oklch(37.7% 0.053 228.9)
-
Step 950
950
#142A34
oklch(27.2% 0.034 229.2)
#3983A4 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) | #7281A6 | 0.061 |
| Deuteranopia (no green cones) | #6376A4 | 0.053 |
| Tritanopia (no blue cones) | #008C8E | 0.055 |
| Achromatopsia (no color) | #7B7B7B | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3983A4
#3983A4
oklch(57.7% 0.089 230.3)
- #A46A48
#A46A48
oklch(57.9% 0.089 50.6)
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 #3983A4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.023
- Stormy Blue #507B9C ΔE 0.028
- Blue NCS #118AB2 ΔE 0.028
- Teal Blue #01889F ΔE 0.028
- Steel Blue #4682B4 ΔE 0.029
- Off Blue #5684AE ΔE 0.033
- Cool Blue #4984B8 ΔE 0.036
- Dusty Blue #5A86AD ΔE 0.037
Use #3983A4 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.