#186FCF
Closest named color: Royal Blue (#4169E1). oklch(54.7% 0.168 255.2), rgb(24, 111, 207).
Aa
White text reads best on this color (4.98:1).
About this color
#186FCF is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.168 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.043 away. White text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.21:1 |
| White text | 4.98:1 |
Values
| HEX | #186FCF |
| RGB | rgb(24, 111, 207) |
| HSL | hsl(211, 79%, 45%) |
| OKLCH | oklch(54.7% 0.168 255.2) |
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 #186FCF | 4.98:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #186FCF | 4.21:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #186FCF text on white | 4.98:1 | AA | Lc 73.9 | Content text, not long reading |
| #186FCF text on black | 4.21:1 | AA large text | Lc -27.8 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A0C3F1
oklch(80.8% 0.076 255.4)
-
Step 400
400
#6BA3EA
oklch(70.6% 0.12 254.9)
-
Step 500
500
#418AE4
oklch(63.1% 0.154 255.2)
-
Step 600
600 (this color)
#186FCF
oklch(54.7% 0.168 255.2)
-
Step 700
700
#0C5FB6
oklch(49.1% 0.156 255.1)
-
Step 800
800
#104E93
oklch(42.7% 0.128 255.1)
-
Step 900
900
#164175
oklch(37.5% 0.101 255.3)
-
Step 950
950
#0F2745
oklch(27.1% 0.064 255.3)
#186FCF 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) | #3978D3 | 0.035 |
| Deuteranopia (no green cones) | #0068CD | 0.021 |
| Tritanopia (no blue cones) | #008695 | 0.125 |
| Achromatopsia (no color) | #707070 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #186FCF
#186FCF
oklch(54.7% 0.168 255.2)
- #976500
#976500
oklch(54.6% 0.115 75.1)
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 #186FCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.043
- Windows Blue #3778BF ΔE 0.043
- Mid Blue #276AB3 ΔE 0.044
- Cerulean Blue #056EEE ΔE 0.048
- French Blue #436BAD ΔE 0.057
- Nice Blue #107AB0 ΔE 0.062
- Azul #1D5DEC ΔE 0.064
- Neon Blue #4361EE ΔE 0.066
Use #186FCF 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.