#186F9E
Closest named color: Ocean Blue (#03719C). oklch(51.6% 0.107 238.8), rgb(24, 111, 158).
Aa
White text reads best on this color (5.51:1).
About this color
#186F9E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.107 and its hue 239°. 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 5.51:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.80:1 |
| White text | 5.51:1 |
Values
| HEX | #186F9E |
| RGB | rgb(24, 111, 158) |
| HSL | hsl(201, 74%, 36%) |
| OKLCH | oklch(51.6% 0.107 238.8) |
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 #186F9E | 5.51:1 | AA | Lc -82.4 | Fine for body text |
| Black text on #186F9E | 3.80:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #186F9E text on white | 5.51:1 | AA | Lc 77.1 | Fine for body text |
| #186F9E text on black | 3.80:1 | AA large text | Lc -24.6 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
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
#A3C6DF
oklch(80.9% 0.052 239.4)
-
Step 400
400
#6EA8CF
oklch(70.7% 0.083 239)
-
Step 500
500
#4492C2
oklch(63.1% 0.105 238.6)
-
Step 600
600
#1C7BAF
oklch(55.5% 0.116 239.1)
-
Step 700
700 (this color)
#186F9E
oklch(51.6% 0.107 238.8)
-
Step 800
800
#10557A
oklch(42.8% 0.089 238.6)
-
Step 900
900
#174662
oklch(37.6% 0.069 238.8)
-
Step 950
950
#0F2939
oklch(26.9% 0.044 238.4)
#186F9E 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) | #586FA0 | 0.056 |
| Deuteranopia (no green cones) | #47639D | 0.046 |
| Tritanopia (no blue cones) | #007B7F | 0.071 |
| Achromatopsia (no color) | #696969 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #186F9E
#186F9E
oklch(51.6% 0.107 238.8)
- #94561D
#94561D
oklch(51.5% 0.107 58.6)
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 #186F9E, 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 0.024
- Muted Blue #3B719F ΔE 0.025
- Peacock Blue #016795 ΔE 0.028
- Flat Blue #3C73A8 ΔE 0.033
- Nice Blue #107AB0 ΔE 0.038
- Mid Blue #276AB3 ΔE 0.040
- Denim #3B638C ΔE 0.042
Use #186F9E 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.