#3979A0
Closest named color: Cerulean (#457B9D). oklch(55.1% 0.089 238.1), rgb(57, 121, 160).
Aa
White text reads best on this color (4.75:1).
About this color
#3979A0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.089 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.014 away. White text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.41:1 |
| White text | 4.75:1 |
Values
| HEX | #3979A0 |
| RGB | rgb(57, 121, 160) |
| HSL | hsl(203, 47%, 43%) |
| OKLCH | oklch(55.1% 0.089 238.1) |
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 #3979A0 | 4.75:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #3979A0 | 4.41:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #3979A0 text on white | 4.75:1 | AA | Lc 72.8 | Content text, not long reading |
| #3979A0 text on black | 4.41:1 | AA large text | Lc -28.9 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE6
oklch(88.5% 0.022 235)
-
Step 300
300
#A9C5D8
oklch(80.9% 0.041 237.7)
-
Step 400
400
#7BA7C4
oklch(70.7% 0.064 237.7)
-
Step 500
500
#5791B6
oklch(63.2% 0.083 238)
-
Step 600
600 (this color)
#3979A0
oklch(55.1% 0.089 238.1)
-
Step 700
700
#2C678A
oklch(49.1% 0.083 237.9)
-
Step 800
800
#265470
oklch(42.7% 0.069 238)
-
Step 900
900
#24465B
oklch(37.8% 0.054 237.6)
-
Step 950
950
#162935
oklch(27.1% 0.033 237.5)
#3979A0 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) | #6779A2 | 0.051 |
| Deuteranopia (no green cones) | #596E9F | 0.043 |
| Tritanopia (no blue cones) | #008386 | 0.064 |
| Achromatopsia (no color) | #737373 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3979A0
#3979A0
oklch(55.1% 0.089 238.1)
- #99643A
#99643A
oklch(55.1% 0.089 57.9)
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 #3979A0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.014
- Dull Blue #49759C ΔE 0.017
- Muted Blue #3B719F ΔE 0.023
- Flat Blue #3C73A8 ΔE 0.024
- Stormy Blue #507B9C ΔE 0.024
- Nice Blue #107AB0 ΔE 0.031
- Metallic Blue #4F738E ΔE 0.033
- Sea Blue #047495 ΔE 0.037
Use #3979A0 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.