#31779B
Closest named color: Muted Blue (#3B719F). oklch(54.1% 0.089 234.3), rgb(49, 119, 155).
Aa
White text reads best on this color (4.94:1).
About this color
#31779B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.089 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.021 away. White text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 4.24:1 |
| White text | 4.94:1 |
Values
| HEX | #31779B |
| RGB | rgb(49, 119, 155) |
| HSL | hsl(200, 52%, 40%) |
| OKLCH | oklch(54.1% 0.089 234.3) |
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 #31779B | 4.94:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #31779B | 4.24:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #31779B text on white | 4.94:1 | AA | Lc 74.0 | Content text, not long reading |
| #31779B text on black | 4.24:1 | AA large text | Lc -27.7 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE6
oklch(88.5% 0.022 235)
-
Step 300
300
#A8C5D7
oklch(80.8% 0.04 235.3)
-
Step 400
400
#79A8C3
oklch(70.8% 0.064 234.1)
-
Step 500
500
#5492B4
oklch(63.2% 0.082 234.1)
-
Step 600
600 (this color)
#31779B
oklch(54.1% 0.089 234.3)
-
Step 700
700
#286889
oklch(49.1% 0.083 234.7)
-
Step 800
800
#23556F
oklch(42.8% 0.069 234.3)
-
Step 900
900
#22465A
oklch(37.7% 0.054 235)
-
Step 950
950
#152935
oklch(27% 0.034 236.3)
#31779B 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) | #66769D | 0.057 |
| Deuteranopia (no green cones) | #576B9A | 0.048 |
| Tritanopia (no blue cones) | #008083 | 0.057 |
| Achromatopsia (no color) | #707070 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31779B
#31779B
oklch(54.1% 0.089 234.3)
- #97603A
#97603A
oklch(54.1% 0.089 54.3)
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 #31779B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.021
- Dull Blue #49759C ΔE 0.022
- Cerulean #457B9D ΔE 0.023
- Sea Blue #047495 ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.028
- Ocean #017B92 ΔE 0.029
- Ocean Blue #03719C ΔE 0.030
- Metallic Blue #4F738E ΔE 0.032
Use #31779B 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.