#1B63D1
Closest named color: Royal Blue (#4169E1). oklch(52.3% 0.184 259.5), rgb(27, 99, 209).
Aa
White text reads best on this color (5.59:1).
About this color
#1B63D1 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.184 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.043 away. White text reads best on it, at 5.59:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.184) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.75:1 |
| White text | 5.59:1 |
Values
| HEX | #1B63D1 |
| RGB | rgb(27, 99, 209) |
| HSL | hsl(216, 77%, 46%) |
| OKLCH | oklch(52.3% 0.184 259.5) |
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 #1B63D1 | 5.59:1 | AA | Lc -82.6 | Fine for body text |
| Black text on #1B63D1 | 3.75:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #1B63D1 text on white | 5.59:1 | AA | Lc 77.3 | Fine for body text |
| #1B63D1 text on black | 3.75:1 | AA large text | Lc -24.4 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFA
oklch(88.4% 0.049 259.8)
-
Step 300
300
#9FC2FA
oklch(80.9% 0.088 259.7)
-
Step 400
400
#69A0F8
oklch(70.6% 0.142 259.4)
-
Step 500
500
#3F85F5
oklch(63% 0.182 259.5)
-
Step 600
600
#1D6CE4
oklch(55.7% 0.197 259.5)
-
Step 700
700 (this color)
#1B63D1
oklch(52.3% 0.184 259.5)
-
Step 800
800
#1049A0
oklch(42.6% 0.153 259.6)
-
Step 900
900
#163F7F
oklch(37.8% 0.118 259.3)
-
Step 950
950
#0E254A
oklch(26.9% 0.075 259.5)
#1B63D1 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) | #0870D5 | 0.033 |
| Deuteranopia (no green cones) | #0060CF | 0.013 |
| Tritanopia (no blue cones) | #007E90 | 0.140 |
| Achromatopsia (no color) | #686868 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B63D1
#1B63D1
oklch(52.3% 0.184 259.5)
- #8B6100
#8B6100
oklch(52.3% 0.109 79.1)
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 #1B63D1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.043
- Azul #1D5DEC ΔE 0.044
- Warm Blue #4B57DB ΔE 0.049
- Cerulean Blue #056EEE ΔE 0.050
- Mid Blue #276AB3 ΔE 0.053
- Neon Blue #4361EE ΔE 0.056
- Bright Blue #0165FC ΔE 0.066
- French Blue #436BAD ΔE 0.070
Use #1B63D1 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.