#518FFB
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.1% 0.173 260.7), rgb(81, 143, 251).
Aa
Black text reads best on this color (6.67:1).
About this color
#518FFB is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.173 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.027 away. Black text reads best on it, at 6.67:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.67:1 |
| White text | 3.14:1 |
Values
| HEX | #518FFB |
| RGB | rgb(81, 143, 251) |
| HSL | hsl(218, 96%, 65%) |
| OKLCH | oklch(66.1% 0.173 260.7) |
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 #518FFB | 3.14:1 | AA large text | Lc -63.6 | Content text, not long reading |
| Black text on #518FFB | 6.67:1 | AA | Lc 45.8 | Large or bold text, headings |
| #518FFB text on white | 3.14:1 | AA large text | Lc 58.2 | Large or bold text, headings |
| #518FFB text on black | 6.67:1 | AA | Lc -43.5 | 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 500.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A2C2F8
oklch(81% 0.084 260.7)
-
Step 400
400
#6FA0F5
oklch(70.8% 0.136 260.8)
-
Step 500
500 (this color)
#518FFB
oklch(66.1% 0.173 260.7)
-
Step 600
600
#2A6CDF
oklch(55.6% 0.188 260.7)
-
Step 700
700
#1D59C2
oklch(49.1% 0.176 260.8)
-
Step 800
800
#1A4A9D
oklch(42.8% 0.145 260.6)
-
Step 900
900
#1B3F7C
oklch(37.8% 0.112 260.3)
-
Step 950
950
#112549
oklch(27% 0.072 261.1)
#518FFB 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) | #5B9AFF | 0.032 |
| Deuteranopia (no green cones) | #3D8AF9 | 0.023 |
| Tritanopia (no blue cones) | #00A8B9 | 0.139 |
| Achromatopsia (no color) | #919191 | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #518FFB
#518FFB
oklch(66.1% 0.173 260.7)
- #BD8800
#BD8800
oklch(66.2% 0.137 80.9)
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 #518FFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.027
- Dodger Blue #1E90FF ΔE 0.031
- Soft Blue #6488EA ΔE 0.032
- Cornflower Blue #6495ED ΔE 0.034
- Dark Sky Blue #448EE4 ΔE 0.037
- Cornflower #6A79F7 ΔE 0.056
- Lavender Blue #8B88F8 ΔE 0.067
- Clear Blue #247AFD ΔE 0.068
Use #518FFB 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.