#5171ED
Closest named color: Royal Blue (#4169E1). oklch(59.2% 0.19 269), rgb(81, 113, 237).
Aa
Black text reads best on this color (4.93:1).
About this color
#5171ED is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.190 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.033 away. Black text reads best on it, at 4.93:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.190) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.93:1 |
| White text | 4.25:1 |
Values
| HEX | #5171ED |
| RGB | rgb(81, 113, 237) |
| HSL | hsl(228, 81%, 62%) |
| OKLCH | oklch(59.2% 0.19 269) |
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 #5171ED | 4.25:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #5171ED | 4.93:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #5171ED text on white | 4.25:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #5171ED text on black | 4.93:1 | AA | Lc -32.6 | 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
#CCD9FA
oklch(88.6% 0.048 268.4)
-
Step 300
300
#AABFF9
oklch(80.9% 0.086 269)
-
Step 400
400
#7E9BF6
oklch(70.7% 0.137 269.3)
-
Step 500
500
#5F80F2
oklch(63.2% 0.174 268.9)
-
Step 600
600 (this color)
#5171ED
oklch(59.2% 0.19 269)
-
Step 700
700
#3A53C3
oklch(49% 0.177 269.3)
-
Step 800
800
#2F459E
oklch(42.7% 0.147 268.9)
-
Step 900
900
#293B7D
oklch(37.6% 0.114 268.9)
-
Step 950
950
#182349
oklch(26.9% 0.072 269)
#5171ED 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) | #1E82F1 | 0.050 |
| Deuteranopia (no green cones) | #0074EA | 0.047 |
| Tritanopia (no blue cones) | #008EA4 | 0.156 |
| Achromatopsia (no color) | #7B7B7B | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5171ED
#5171ED
oklch(59.2% 0.19 269)
- #9B7900
#9B7900
oklch(59.2% 0.121 88.9)
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 #5171ED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.033
- Cornflower #6A79F7 ΔE 0.041
- Clear Blue #247AFD ΔE 0.042
- Neon Blue #4361EE ΔE 0.043
- Cerulean Blue #056EEE ΔE 0.050
- Medium Slate Blue #7B68EE ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.060
- Bright Blue #0165FC ΔE 0.066
Use #5171ED 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.