#516BBB
Closest named color: French Blue (#436BAD). oklch(54.6% 0.128 268.4), rgb(81, 107, 187).
Aa
White text reads best on this color (5.03:1).
About this color
#516BBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.128 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.028 away. White text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.17:1 |
| White text | 5.03:1 |
Values
| HEX | #516BBB |
| RGB | rgb(81, 107, 187) |
| HSL | hsl(225, 44%, 53%) |
| OKLCH | oklch(54.6% 0.128 268.4) |
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 #516BBB | 5.03:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #516BBB | 4.17:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #516BBB text on white | 5.03:1 | AA | Lc 74.6 | Content text, not long reading |
| #516BBB text on black | 4.17:1 | AA large text | Lc -27.1 | 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 600.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B1C0E7
oklch(80.9% 0.058 268.6)
-
Step 400
400
#889FDB
oklch(70.8% 0.092 267.9)
-
Step 500
500
#6B85D1
oklch(63% 0.119 268.5)
-
Step 600
600 (this color)
#516BBB
oklch(54.6% 0.128 268.4)
-
Step 700
700
#445BA4
oklch(49% 0.12 268.5)
-
Step 800
800
#384B85
oklch(42.7% 0.099 268.3)
-
Step 900
900
#303F6A
oklch(37.6% 0.076 268.1)
-
Step 950
950
#1C253E
oklch(26.9% 0.049 268)
#516BBB 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) | #4874BE | 0.025 |
| Deuteranopia (no green cones) | #3B6AB9 | 0.025 |
| Tritanopia (no blue cones) | #0A7D8A | 0.115 |
| Achromatopsia (no color) | #6F6F6F | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516BBB
#516BBB
oklch(54.6% 0.128 268.4)
- #8B6C00
#8B6C00
oklch(54.7% 0.112 88.7)
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 #516BBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.028
- Windows Blue #3778BF ΔE 0.040
- Mid Blue #276AB3 ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.046
- Iris #6258C4 ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.055
- Muted Blue #3B719F ΔE 0.057
- Royal Blue #4169E1 ΔE 0.062
Use #516BBB 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.