#3979A1
Closest named color: Cerulean (#457B9D). oklch(55.2% 0.09 238.8), rgb(57, 121, 161).
Aa
White text reads best on this color (4.74:1).
About this color
#3979A1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.090 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.015 away. White text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #3979A1 |
| RGB | rgb(57, 121, 161) |
| HSL | hsl(203, 48%, 43%) |
| OKLCH | oklch(55.2% 0.09 238.8) |
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 #3979A1 | 4.74:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #3979A1 | 4.42:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #3979A1 text on white | 4.74:1 | AA | Lc 72.7 | Content text, not long reading |
| #3979A1 text on black | 4.42:1 | 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
#CCDCE7
oklch(88.6% 0.023 237.7)
-
Step 300
300
#A9C5D8
oklch(80.9% 0.041 237.7)
-
Step 400
400
#7BA7C5
oklch(70.8% 0.065 238.7)
-
Step 500
500
#5791B6
oklch(63.2% 0.083 238)
-
Step 600
600 (this color)
#3979A1
oklch(55.2% 0.09 238.8)
-
Step 700
700
#2C678B
oklch(49.1% 0.084 238.6)
-
Step 800
800
#265471
oklch(42.7% 0.07 239)
-
Step 900
900
#24465B
oklch(37.8% 0.054 237.6)
-
Step 950
950
#162935
oklch(27.1% 0.033 237.5)
#3979A1 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) | #6779A3 | 0.051 |
| Deuteranopia (no green cones) | #586EA0 | 0.042 |
| Tritanopia (no blue cones) | #008387 | 0.064 |
| Achromatopsia (no color) | #737373 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3979A1
#3979A1
oklch(55.2% 0.09 238.8)
- #996439
#996439
oklch(55.1% 0.09 58.4)
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 #3979A1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.015
- Dull Blue #49759C ΔE 0.017
- Muted Blue #3B719F ΔE 0.023
- Flat Blue #3C73A8 ΔE 0.023
- Stormy Blue #507B9C ΔE 0.025
- Nice Blue #107AB0 ΔE 0.030
- Metallic Blue #4F738E ΔE 0.034
- Sea Blue #047495 ΔE 0.038
Use #3979A1 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.