#1F66D6
Closest named color: Royal Blue (#4169E1). oklch(53.4% 0.186 259.7), rgb(31, 102, 214).
Aa
White text reads best on this color (5.34:1).
About this color
#1F66D6 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.186 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.034 away. White text reads best on it, at 5.34:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.186) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.92:1 |
| White text | 5.34:1 |
Values
| HEX | #1F66D6 |
| RGB | rgb(31, 102, 214) |
| HSL | hsl(217, 75%, 48%) |
| OKLCH | oklch(53.4% 0.186 259.7) |
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 #1F66D6 | 5.34:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #1F66D6 | 3.92:1 | AA large text | Lc 28.1 | Dividers and decoration only |
| #1F66D6 text on white | 5.34:1 | AA | Lc 76.0 | Fine for body text |
| #1F66D6 text on black | 3.92:1 | AA large text | Lc -25.8 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFB
oklch(93.7% 0.024 259.8)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A1C2F7
oklch(80.9% 0.084 259.8)
-
Step 400
400
#6DA0F3
oklch(70.6% 0.134 259.7)
-
Step 500
500
#4686EF
oklch(63.1% 0.171 259.8)
-
Step 600
600 (this color)
#1F66D6
oklch(53.4% 0.186 259.7)
-
Step 700
700
#195AC0
oklch(49% 0.173 259.7)
-
Step 800
800
#184A9C
oklch(42.7% 0.144 260)
-
Step 900
900
#1A3F7C
oklch(37.7% 0.112 259.9)
-
Step 950
950
#102548
oklch(26.9% 0.071 260)
#1F66D6 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) | #0D73DA | 0.033 |
| Deuteranopia (no green cones) | #0063D4 | 0.015 |
| Tritanopia (no blue cones) | #008294 | 0.143 |
| Achromatopsia (no color) | #6B6B6B | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F66D6
#1F66D6
oklch(53.4% 0.186 259.7)
- #8E6400
#8E6400
oklch(53.3% 0.111 79.8)
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 #1F66D6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.034
- Cerulean Blue #056EEE ΔE 0.040
- Azul #1D5DEC ΔE 0.041
- Neon Blue #4361EE ΔE 0.048
- Warm Blue #4B57DB ΔE 0.048
- Mid Blue #276AB3 ΔE 0.057
- Bright Blue #0165FC ΔE 0.058
- Windows Blue #3778BF ΔE 0.068
Use #1F66D6 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.