#1A66DC
Closest named color: Royal Blue (#4169E1). oklch(53.8% 0.195 259.8), rgb(26, 102, 220).
Aa
White text reads best on this color (5.27:1).
About this color
#1A66DC is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.195 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.032 away. White text reads best on it, at 5.27:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.195) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.97:1 |
| White text | 5.27:1 |
Values
| HEX | #1A66DC |
| RGB | rgb(26, 102, 220) |
| HSL | hsl(216, 79%, 48%) |
| OKLCH | oklch(53.8% 0.195 259.8) |
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 #1A66DC | 5.27:1 | AA | Lc -80.9 | Fine for body text |
| Black text on #1A66DC | 3.97:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #1A66DC text on white | 5.27:1 | AA | Lc 75.5 | Fine for body text |
| #1A66DC text on black | 3.97:1 | AA large text | Lc -26.2 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#9FC2FA
oklch(80.9% 0.088 259.7)
-
Step 400
400
#6BA0F7
oklch(70.7% 0.14 259.9)
-
Step 500
500
#4285F4
oklch(63% 0.18 260)
-
Step 600
600 (this color)
#1A66DC
oklch(53.8% 0.195 259.8)
-
Step 700
700
#1359C5
oklch(49.1% 0.182 259.8)
-
Step 800
800
#134A9F
oklch(42.8% 0.149 259.6)
-
Step 900
900
#173F7E
oklch(37.8% 0.116 259.4)
-
Step 950
950
#0F254A
oklch(27% 0.074 260.2)
#1A66DC 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) | #0075E0 | 0.037 |
| Deuteranopia (no green cones) | #0064DA | 0.011 |
| Tritanopia (no blue cones) | #008397 | 0.147 |
| Achromatopsia (no color) | #6C6C6C | 0.195 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A66DC
#1A66DC
oklch(53.8% 0.195 259.8)
- #906500
#906500
oklch(53.8% 0.112 79.4)
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 #1A66DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.032
- Cerulean Blue #056EEE ΔE 0.032
- Azul #1D5DEC ΔE 0.033
- Neon Blue #4361EE ΔE 0.042
- Warm Blue #4B57DB ΔE 0.048
- Bright Blue #0165FC ΔE 0.049
- Mid Blue #276AB3 ΔE 0.066
- Electric Blue #0652FF ΔE 0.070
Use #1A66DC 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.