#3183AA
Closest named color: Blue NCS (#118AB2). oklch(57.8% 0.098 232.9), rgb(49, 131, 170).
Aa
Black text reads best on this color (4.95:1).
About this color
#3183AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.098 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.022 away. Black text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #3183AA |
| RGB | rgb(49, 131, 170) |
| HSL | hsl(199, 55%, 43%) |
| OKLCH | oklch(57.8% 0.098 232.9) |
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 #3183AA | 4.23:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #3183AA | 4.95:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #3183AA text on white | 4.23:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #3183AA text on black | 4.95:1 | AA | Lc -32.7 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF1
oklch(93.7% 0.013 228.9)
-
Step 200
200
#CADCE7
oklch(88.4% 0.025 234.5)
-
Step 300
300
#A5C6D9
oklch(80.9% 0.044 233.3)
-
Step 400
400
#73A9C6
oklch(70.8% 0.071 232.6)
-
Step 500
500
#4B93B7
oklch(63.1% 0.09 232.4)
-
Step 600
600 (this color)
#3183AA
oklch(57.8% 0.098 232.9)
-
Step 700
700
#1A698C
oklch(49.2% 0.091 232.8)
-
Step 800
800
#195671
oklch(42.8% 0.075 231.7)
-
Step 900
900
#1C475C
oklch(37.8% 0.059 232.6)
-
Step 950
950
#122A36
oklch(27.2% 0.037 232.2)
#3183AA 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) | #7082AC | 0.064 |
| Deuteranopia (no green cones) | #5F76A9 | 0.053 |
| Tritanopia (no blue cones) | #008D90 | 0.060 |
| Achromatopsia (no color) | #7B7B7B | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3183AA
#3183AA
oklch(57.8% 0.098 232.9)
- #A7683F
#A7683F
oklch(57.7% 0.099 52.6)
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 #3183AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.022
- Steel Blue #4682B4 ΔE 0.024
- Cerulean #457B9D ΔE 0.028
- Cool Blue #4984B8 ΔE 0.031
- Teal Blue #01889F ΔE 0.031
- Stormy Blue #507B9C ΔE 0.034
- Off Blue #5684AE ΔE 0.034
- Nice Blue #107AB0 ΔE 0.036
Use #3183AA 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.