#5171DB
Closest named color: Royal Blue (#4169E1). oklch(57.9% 0.166 268.3), rgb(81, 113, 219).
Aa
Black text reads best on this color (4.73:1).
About this color
#5171DB is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.166 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.030 away. Black text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.73:1 |
| White text | 4.43:1 |
Values
| HEX | #5171DB |
| RGB | rgb(81, 113, 219) |
| HSL | hsl(226, 66%, 59%) |
| OKLCH | oklch(57.9% 0.166 268.3) |
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 #5171DB | 4.43:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #5171DB | 4.73:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #5171DB text on white | 4.43:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #5171DB text on black | 4.73:1 | AA | Lc -31.2 | Non-text elements, placeholder text |
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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ACBFF2
oklch(80.8% 0.075 268.8)
-
Step 400
400
#819DEB
oklch(70.7% 0.119 268.2)
-
Step 500
500
#6283E5
oklch(63.2% 0.152 267.9)
-
Step 600
600 (this color)
#5171DB
oklch(57.9% 0.166 268.3)
-
Step 700
700
#3C57B7
oklch(49% 0.155 268.3)
-
Step 800
800
#324894
oklch(42.7% 0.128 268.4)
-
Step 900
900
#2B3D76
oklch(37.7% 0.1 268.2)
-
Step 950
950
#192445
oklch(26.9% 0.063 268.1)
#5171DB 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) | #397EDF | 0.036 |
| Deuteranopia (no green cones) | #1B72D9 | 0.042 |
| Tritanopia (no blue cones) | #00899B | 0.140 |
| Achromatopsia (no color) | #787878 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5171DB
#5171DB
oklch(57.9% 0.166 268.3)
- #977500
#977500
oklch(57.9% 0.118 88.3)
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 #5171DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.030
- Dark Periwinkle #665FD1 ΔE 0.049
- Neon Blue #4361EE ΔE 0.054
- Windows Blue #3778BF ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.057
- Cornflower #6A79F7 ΔE 0.057
- Clear Blue #247AFD ΔE 0.060
- Slate Blue #6A5ACD ΔE 0.062
Use #5171DB 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.