#5B6FBB
Closest named color: French Blue (#436BAD). oklch(56.1% 0.12 271), rgb(91, 111, 187).
Aa
White text reads best on this color (4.73:1).
About this color
#5B6FBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.120 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.039 away. White text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.43:1 |
| White text | 4.73:1 |
Values
| HEX | #5B6FBB |
| RGB | rgb(91, 111, 187) |
| HSL | hsl(228, 41%, 55%) |
| OKLCH | oklch(56.1% 0.12 271) |
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 #5B6FBB | 4.73:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #5B6FBB | 4.43:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #5B6FBB text on white | 4.73:1 | AA | Lc 72.7 | Content text, not long reading |
| #5B6FBB text on black | 4.43:1 | AA large text | Lc -29.0 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF5
oklch(93.7% 0.015 270)
-
Step 200
200
#D1D9EE
oklch(88.6% 0.03 269.1)
-
Step 300
300
#B3BFE4
oklch(80.8% 0.054 271)
-
Step 400
400
#8C9ED7
oklch(70.7% 0.086 270.6)
-
Step 500
500
#7185CC
oklch(63.1% 0.11 271)
-
Step 600
600 (this color)
#5B6FBB
oklch(56.1% 0.12 271)
-
Step 700
700
#4A5BA0
oklch(49.1% 0.112 271.3)
-
Step 800
800
#3C4B81
oklch(42.7% 0.092 270.4)
-
Step 900
900
#333F68
oklch(37.7% 0.072 270.3)
-
Step 950
950
#1E253D
oklch(27% 0.046 270.7)
#5B6FBB 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) | #5178BE | 0.025 |
| Deuteranopia (no green cones) | #466FB9 | 0.025 |
| Tritanopia (no blue cones) | #317F8C | 0.107 |
| Achromatopsia (no color) | #737373 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B6FBB
#5B6FBB
oklch(56.1% 0.12 271)
- #8E7100
#8E7100
oklch(56.1% 0.115 90.8)
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 #5B6FBB, closest first.
No curated palette has a color within ΔE 0.04 of #5B6FBB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.039
- Windows Blue #3778BF ΔE 0.040
- Flat Blue #3C73A8 ΔE 0.049
- Mid Blue #276AB3 ΔE 0.058
- Dark Periwinkle #665FD1 ΔE 0.058
- Steel Blue #4682B4 ΔE 0.059
- Muted Blue #3B719F ΔE 0.060
- Dull Blue #49759C ΔE 0.060
Use #5B6FBB 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.