#3181BA
Closest named color: Steel Blue (#4682B4). oklch(58.1% 0.117 243.6), rgb(49, 129, 186).
Aa
Black text reads best on this color (4.97:1).
About this color
#3181BA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.117 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.019 away. Black text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.97:1 |
| White text | 4.21:1 |
Values
| HEX | #3181BA |
| RGB | rgb(49, 129, 186) |
| HSL | hsl(205, 58%, 46%) |
| OKLCH | oklch(58.1% 0.117 243.6) |
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 #3181BA | 4.21:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #3181BA | 4.97:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #3181BA text on white | 4.21:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #3181BA text on black | 4.97:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C5E0
oklch(80.8% 0.052 243.1)
-
Step 400
400
#72A7D1
oklch(70.7% 0.083 243.2)
-
Step 500
500
#4A90C5
oklch(63.1% 0.107 243.5)
-
Step 600
600 (this color)
#3181BA
oklch(58.1% 0.117 243.6)
-
Step 700
700
#196699
oklch(49.1% 0.108 243.5)
-
Step 800
800
#19537C
oklch(42.6% 0.09 244)
-
Step 900
900
#1C4564
oklch(37.7% 0.07 244.2)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#3181BA 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) | #6782BC | 0.053 |
| Deuteranopia (no green cones) | #5475B9 | 0.042 |
| Tritanopia (no blue cones) | #008F95 | 0.082 |
| Achromatopsia (no color) | #7B7B7B | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3181BA
#3181BA
oklch(58.1% 0.117 243.6)
- #AA6A23
#AA6A23
oklch(58.2% 0.116 63.9)
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 #3181BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.019
- Cool Blue #4984B8 ΔE 0.022
- Windows Blue #3778BF ΔE 0.028
- Water Blue #0E87CC ΔE 0.030
- Nice Blue #107AB0 ΔE 0.031
- Blue NCS #118AB2 ΔE 0.033
- Off Blue #5684AE ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.043
Use #3181BA 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.