#5B7BBC
Closest named color: Cool Blue (#4984B8). oklch(58.7% 0.107 263.5), rgb(91, 123, 188).
Aa
Black text reads best on this color (5.00:1).
About this color
#5B7BBC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.107 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.032 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #5B7BBC |
| RGB | rgb(91, 123, 188) |
| HSL | hsl(220, 42%, 55%) |
| OKLCH | oklch(58.7% 0.107 263.5) |
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 #5B7BBC | 4.19:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #5B7BBC | 5.00:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #5B7BBC text on white | 4.19:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #5B7BBC text on black | 5.00:1 | AA | Lc -32.8 | 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 600.
-
Step 50
50
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D0D9EB
oklch(88.4% 0.027 264.4)
-
Step 300
300
#B1C1E1
oklch(80.9% 0.049 264.3)
-
Step 400
400
#88A1D1
oklch(70.8% 0.076 263.2)
-
Step 500
500
#6A89C5
oklch(63.1% 0.098 263)
-
Step 600
600 (this color)
#5B7BBC
oklch(58.7% 0.107 263.5)
-
Step 700
700
#435F99
oklch(49.1% 0.099 263.6)
-
Step 800
800
#374E7C
oklch(42.8% 0.082 263.2)
-
Step 900
900
#304164
oklch(37.8% 0.064 263.8)
-
Step 950
950
#1C263A
oklch(26.9% 0.04 263.6)
#5B7BBC 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) | #6280BF | 0.017 |
| Deuteranopia (no green cones) | #5778BB | 0.010 |
| Tritanopia (no blue cones) | #2D8993 | 0.095 |
| Achromatopsia (no color) | #7C7C7C | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B7BBC
#5B7BBC
oklch(58.7% 0.107 263.5)
- #9B7623
#9B7623
oklch(58.8% 0.107 83.3)
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 #5B7BBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.032
- Steel Blue #4682B4 ΔE 0.033
- Off Blue #5684AE ΔE 0.038
- Windows Blue #3778BF ΔE 0.038
- Dusty Blue #5A86AD ΔE 0.044
- Faded Blue #658CBB ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.052
- Stormy Blue #507B9C ΔE 0.053
Use #5B7BBC 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.