#186E9B
Closest named color: Ocean Blue (#03719C). oklch(51.2% 0.104 237.9), rgb(24, 110, 155).
Aa
White text reads best on this color (5.61:1).
About this color
#186E9B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.104 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.009 away. White text reads best on it, at 5.61:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.74:1 |
| White text | 5.61:1 |
Values
| HEX | #186E9B |
| RGB | rgb(24, 110, 155) |
| HSL | hsl(201, 73%, 35%) |
| OKLCH | oklch(51.2% 0.104 237.9) |
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 #186E9B | 5.61:1 | AA | Lc -82.9 | Fine for body text |
| Black text on #186E9B | 3.74:1 | AA large text | Lc 26.4 | Dividers and decoration only |
| #186E9B text on white | 5.61:1 | AA | Lc 77.6 | Fine for body text |
| #186E9B text on black | 3.74:1 | AA large text | Lc -24.1 | 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 700.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A3C6DE
oklch(80.9% 0.051 238.2)
-
Step 400
400
#6FA8CD
oklch(70.6% 0.081 237.9)
-
Step 500
500
#4592C0
oklch(63.1% 0.103 237.7)
-
Step 600
600
#1E7CAD
oklch(55.7% 0.112 237.5)
-
Step 700
700 (this color)
#186E9B
oklch(51.2% 0.104 237.9)
-
Step 800
800
#115578
oklch(42.7% 0.086 237.3)
-
Step 900
900
#184661
oklch(37.6% 0.068 238.2)
-
Step 950
950
#102939
oklch(26.9% 0.043 239.2)
#186E9B 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) | #586E9D | 0.057 |
| Deuteranopia (no green cones) | #47629A | 0.047 |
| Tritanopia (no blue cones) | #00797E | 0.066 |
| Achromatopsia (no color) | #686868 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #186E9B
#186E9B
oklch(51.2% 0.104 237.9)
- #925520
#925520
oklch(51.1% 0.104 57.7)
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 #186E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.009
- Sea Blue #047495 ΔE 0.023
- Peacock Blue #016795 ΔE 0.024
- Muted Blue #3B719F ΔE 0.028
- Flat Blue #3C73A8 ΔE 0.037
- Denim #3B638C ΔE 0.039
- Nice Blue #107AB0 ΔE 0.043
- Mid Blue #276AB3 ΔE 0.044
Use #186E9B 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.