#3188AA
Closest named color: Blue NCS (#118AB2). oklch(59% 0.096 228), rgb(49, 136, 170).
Aa
Black text reads best on this color (5.23:1).
About this color
#3188AA is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.096 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.016 away. Black text reads best on it, at 5.23:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.23:1 |
| White text | 4.01:1 |
Values
| HEX | #3188AA |
| RGB | rgb(49, 136, 170) |
| HSL | hsl(197, 55%, 43%) |
| OKLCH | oklch(59% 0.096 228) |
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 #3188AA | 4.01:1 | AA large text | Lc -72.6 | Content text, not long reading |
| Black text on #3188AA | 5.23:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #3188AA text on white | 4.01:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #3188AA text on black | 5.23:1 | AA | Lc -34.5 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADDE6
oklch(88.6% 0.024 227.8)
-
Step 300
300
#A4C7D7
oklch(80.9% 0.044 227.3)
-
Step 400
400
#71AAC3
oklch(70.8% 0.07 227.4)
-
Step 500
500
#4894B4
oklch(63.1% 0.089 228.2)
-
Step 600
600 (this color)
#3188AA
oklch(59% 0.096 228)
-
Step 700
700
#146A88
oklch(49.1% 0.089 227.6)
-
Step 800
800
#16566F
oklch(42.6% 0.074 229)
-
Step 900
900
#1A475A
oklch(37.6% 0.058 229.1)
-
Step 950
950
#112A34
oklch(27% 0.036 226.6)
#3188AA 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) | #7686AC | 0.070 |
| Deuteranopia (no green cones) | #667AAA | 0.060 |
| Tritanopia (no blue cones) | #009293 | 0.056 |
| Achromatopsia (no color) | #7F7F7F | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3188AA
#3188AA
oklch(59% 0.096 228)
- #AC6B49
#AC6B49
oklch(59.1% 0.096 47.8)
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 #3188AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.016
- Teal Blue #01889F ΔE 0.026
- Steel Blue #4682B4 ΔE 0.030
- Cool Blue #4984B8 ΔE 0.034
- Off Blue #5684AE ΔE 0.034
- Dusty Blue #5A86AD ΔE 0.036
- Cerulean #457B9D ΔE 0.038
- Stormy Blue #507B9C ΔE 0.042
Use #3188AA 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.