#1866CD
Closest named color: Mid Blue (#276AB3). oklch(52.6% 0.176 257.8), rgb(24, 102, 205).
Aa
White text reads best on this color (5.49:1).
About this color
#1866CD is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.176 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.044 away. White text reads best on it, at 5.49:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.82:1 |
| White text | 5.49:1 |
Values
| HEX | #1866CD |
| RGB | rgb(24, 102, 205) |
| HSL | hsl(214, 79%, 45%) |
| OKLCH | oklch(52.6% 0.176 257.8) |
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 #1866CD | 5.49:1 | AA | Lc -82.1 | Fine for body text |
| Black text on #1866CD | 3.82:1 | AA large text | Lc 27.3 | Dividers and decoration only |
| #1866CD text on white | 5.49:1 | AA | Lc 76.8 | Fine for body text |
| #1866CD text on black | 3.82:1 | AA large text | Lc -24.9 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DBF7
oklch(88.6% 0.044 258)
-
Step 300
300
#A1C3F4
oklch(81% 0.079 257.5)
-
Step 400
400
#6DA2EE
oklch(70.7% 0.126 257.4)
-
Step 500
500
#4588E9
oklch(63.1% 0.161 257.9)
-
Step 600
600 (this color)
#1866CD
oklch(52.6% 0.176 257.8)
-
Step 700
700
#165DBB
oklch(49.2% 0.163 257.7)
-
Step 800
800
#154C97
oklch(42.7% 0.135 257.8)
-
Step 900
900
#194078
oklch(37.6% 0.105 257.9)
-
Step 950
950
#102646
oklch(27% 0.066 257.9)
#1866CD 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) | #2271D1 | 0.031 |
| Deuteranopia (no green cones) | #0062CB | 0.014 |
| Tritanopia (no blue cones) | #007F90 | 0.132 |
| Achromatopsia (no color) | #696969 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1866CD
#1866CD
oklch(52.6% 0.176 257.8)
- #8D6100
#8D6100
oklch(52.6% 0.11 77.8)
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 #1866CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.044
- Royal Blue #4169E1 ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.053
- Azul #1D5DEC ΔE 0.053
- Warm Blue #4B57DB ΔE 0.056
- Neon Blue #4361EE ΔE 0.062
- French Blue #436BAD ΔE 0.062
- Windows Blue #3778BF ΔE 0.062
Use #1866CD 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.