#5171E9
Closest named color: Royal Blue (#4169E1). oklch(58.9% 0.185 268.9), rgb(81, 113, 233).
Aa
Black text reads best on this color (4.88:1).
About this color
#5171E9 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.185 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.031 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.88:1 |
| White text | 4.29:1 |
Values
| HEX | #5171E9 |
| RGB | rgb(81, 113, 233) |
| HSL | hsl(227, 78%, 62%) |
| OKLCH | oklch(58.9% 0.185 268.9) |
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 #5171E9 | 4.29:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #5171E9 | 4.88:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #5171E9 text on white | 4.29:1 | AA large text | Lc 69.3 | Content text, not long reading |
| #5171E9 text on black | 4.88:1 | AA | Lc -32.3 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#AABFF7
oklch(80.9% 0.083 268.6)
-
Step 400
400
#7F9CF3
oklch(70.8% 0.132 268.9)
-
Step 500
500
#6080EF
oklch(63.1% 0.17 269)
-
Step 600
600 (this color)
#5171E9
oklch(58.9% 0.185 268.9)
-
Step 700
700
#3A54C0
oklch(49% 0.172 268.9)
-
Step 800
800
#30469C
oklch(42.8% 0.142 268.8)
-
Step 900
900
#2A3C7C
oklch(37.8% 0.111 268.8)
-
Step 950
950
#182348
oklch(26.8% 0.07 268.8)
#5171E9 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) | #2681ED | 0.047 |
| Deuteranopia (no green cones) | #0073E7 | 0.048 |
| Tritanopia (no blue cones) | #008DA2 | 0.153 |
| Achromatopsia (no color) | #7A7A7A | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5171E9
#5171E9
oklch(58.9% 0.185 268.9)
- #9A7800
#9A7800
oklch(58.9% 0.12 88.8)
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 #5171E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.031
- Cornflower #6A79F7 ΔE 0.044
- Neon Blue #4361EE ΔE 0.044
- Clear Blue #247AFD ΔE 0.045
- Cerulean Blue #056EEE ΔE 0.050
- Dark Periwinkle #665FD1 ΔE 0.057
- Medium Slate Blue #7B68EE ΔE 0.058
- Soft Blue #6488EA ΔE 0.066
Use #5171E9 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.