#2B66CD
Closest named color: Royal Blue (#4169E1). oklch(53% 0.171 260.7), rgb(43, 102, 205).
Aa
White text reads best on this color (5.40:1).
About this color
#2B66CD is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.171 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.038 away. White text reads best on it, at 5.40:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.88:1 |
| White text | 5.40:1 |
Values
| HEX | #2B66CD |
| RGB | rgb(43, 102, 205) |
| HSL | hsl(218, 65%, 49%) |
| OKLCH | oklch(53% 0.171 260.7) |
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 #2B66CD | 5.40:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #2B66CD | 3.88:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #2B66CD text on white | 5.40:1 | AA | Lc 76.5 | Fine for body text |
| #2B66CD text on black | 3.88:1 | AA large text | Lc -25.3 | 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 600.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E1EAF9
oklch(93.5% 0.023 260.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A4C2F3
oklch(80.9% 0.077 260.1)
-
Step 400
400
#73A0ED
oklch(70.6% 0.124 260.7)
-
Step 500
500
#4F87E8
oklch(63.2% 0.158 260.6)
-
Step 600
600 (this color)
#2B66CD
oklch(53% 0.171 260.7)
-
Step 700
700
#255BB9
oklch(49% 0.159 260.7)
-
Step 800
800
#204B96
oklch(42.7% 0.132 260.7)
-
Step 900
900
#1F3F77
oklch(37.6% 0.103 260.7)
-
Step 950
950
#132646
oklch(27.1% 0.065 260.2)
#2B66CD 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) | #2572D1 | 0.031 |
| Deuteranopia (no green cones) | #0063CB | 0.022 |
| Tritanopia (no blue cones) | #007F90 | 0.133 |
| Achromatopsia (no color) | #6A6A6A | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B66CD
#2B66CD
oklch(53% 0.171 260.7)
- #8C6400
#8C6400
oklch(53.1% 0.11 81.1)
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 #2B66CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.038
- Mid Blue #276AB3 ΔE 0.044
- Warm Blue #4B57DB ΔE 0.050
- Cerulean Blue #056EEE ΔE 0.053
- Azul #1D5DEC ΔE 0.054
- Neon Blue #4361EE ΔE 0.057
- French Blue #436BAD ΔE 0.058
- Windows Blue #3778BF ΔE 0.059
Use #2B66CD 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.