#1866C4
Closest named color: Mid Blue (#276AB3). oklch(51.9% 0.164 256.4), rgb(24, 102, 196).
Aa
White text reads best on this color (5.62:1).
About this color
#1866C4 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.164 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.031 away. White text reads best on it, at 5.62:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.73:1 |
| White text | 5.62:1 |
Values
| HEX | #1866C4 |
| RGB | rgb(24, 102, 196) |
| HSL | hsl(213, 78%, 43%) |
| OKLCH | oklch(51.9% 0.164 256.4) |
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 #1866C4 | 5.62:1 | AA | Lc -82.8 | Fine for body text |
| Black text on #1866C4 | 3.73:1 | AA large text | Lc 26.6 | Dividers and decoration only |
| #1866C4 text on white | 5.62:1 | AA | Lc 77.5 | Fine for body text |
| #1866C4 text on black | 3.73:1 | AA large text | Lc -24.3 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#A0C3F4
oklch(80.9% 0.079 256.8)
-
Step 400
400
#6AA2EE
oklch(70.6% 0.127 256.4)
-
Step 500
500
#4089E9
oklch(63.1% 0.162 256.4)
-
Step 600
600
#1B70D7
oklch(55.5% 0.176 256.5)
-
Step 700
700 (this color)
#1866C4
oklch(51.9% 0.164 256.4)
-
Step 800
800
#0F4D97
oklch(42.7% 0.135 256.3)
-
Step 900
900
#164178
oklch(37.8% 0.105 256.3)
-
Step 950
950
#0E2646
oklch(26.9% 0.067 256.5)
#1866C4 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) | #2F6FC7 | 0.031 |
| Deuteranopia (no green cones) | #0060C2 | 0.019 |
| Tritanopia (no blue cones) | #007D8B | 0.124 |
| Achromatopsia (no color) | #676767 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1866C4
#1866C4
oklch(51.9% 0.164 256.4)
- #8C5F00
#8C5F00
oklch(52% 0.109 76.6)
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 #1866C4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.031
- French Blue #436BAD ΔE 0.052
- Royal Blue #4169E1 ΔE 0.057
- Windows Blue #3778BF ΔE 0.058
- Warm Blue #4B57DB ΔE 0.065
- Cerulean Blue #056EEE ΔE 0.066
- Azul #1D5DEC ΔE 0.067
- Flat Blue #3C73A8 ΔE 0.068
Use #1866C4 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.