#5B7BCB
Closest named color: Windows Blue (#3778BF). oklch(59.6% 0.128 266.2), rgb(91, 123, 203).
Aa
Black text reads best on this color (5.14:1).
About this color
#5B7BCB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.128 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.043 away. Black text reads best on it, at 5.14:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.14:1 |
| White text | 4.08:1 |
Values
| HEX | #5B7BCB |
| RGB | rgb(91, 123, 203) |
| HSL | hsl(223, 52%, 58%) |
| OKLCH | oklch(59.6% 0.128 266.2) |
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 #5B7BCB | 4.08:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #5B7BCB | 5.14:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #5B7BCB text on white | 4.08:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #5B7BCB text on black | 5.14:1 | AA | Lc -33.8 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#AEC0EA
oklch(80.8% 0.063 266.8)
-
Step 400
400
#839FE0
oklch(70.7% 0.101 266)
-
Step 500
500 (this color)
#5B7BCB
oklch(59.6% 0.128 266.2)
-
Step 600
600
#4D6EC4
oklch(55.6% 0.139 266.2)
-
Step 700
700
#3E5CA9
oklch(49.2% 0.128 265.9)
-
Step 800
800
#334B89
oklch(42.6% 0.107 266.1)
-
Step 900
900
#2D3F6E
oklch(37.7% 0.084 266.6)
-
Step 950
950
#1A2540
oklch(26.9% 0.053 266.2)
#5B7BCB 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) | #5A83CE | 0.021 |
| Deuteranopia (no green cones) | #4C79C9 | 0.019 |
| Tritanopia (no blue cones) | #188D99 | 0.116 |
| Achromatopsia (no color) | #7E7E7E | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B7BCB
#5B7BCB
oklch(59.6% 0.128 266.2)
- #9F7800
#9F7800
oklch(59.5% 0.122 85.7)
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 #5B7BCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.043
- Cool Blue #4984B8 ΔE 0.046
- Steel Blue #4682B4 ΔE 0.050
- Soft Blue #6488EA ΔE 0.056
- Water Blue #0E87CC ΔE 0.056
- Off Blue #5684AE ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.058
- Faded Blue #658CBB ΔE 0.061
Use #5B7BCB 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.