#5B9CBC
Closest named color: Greyblue (#77A1B5). oklch(66.2% 0.082 231.2), rgb(91, 156, 188).
Aa
Black text reads best on this color (6.92:1).
About this color
#5B9CBC is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.082 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.037 away. Black text reads best on it, at 6.92:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.92:1 |
| White text | 3.03:1 |
Values
| HEX | #5B9CBC |
| RGB | rgb(91, 156, 188) |
| HSL | hsl(200, 42%, 55%) |
| OKLCH | oklch(66.2% 0.082 231.2) |
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 #5B9CBC | 3.03:1 | AA large text | Lc -62.3 | Content text, not long reading |
| Black text on #5B9CBC | 6.92:1 | AA | Lc 47.1 | Large or bold text, headings |
| #5B9CBC text on white | 3.03:1 | AA large text | Lc 57.0 | Large or bold text, headings |
| #5B9CBC text on black | 6.92:1 | AA | Lc -44.8 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A7C6D6
oklch(80.9% 0.04 230.3)
-
Step 400
400
#77A8C2
oklch(70.6% 0.065 232)
-
Step 500
500 (this color)
#5B9CBC
oklch(66.2% 0.082 231.2)
-
Step 600
600
#337C9E
oklch(55.5% 0.089 231.7)
-
Step 700
700
#246987
oklch(49.2% 0.083 230.7)
-
Step 800
800
#20556E
oklch(42.6% 0.069 232.1)
-
Step 900
900
#204759
oklch(37.8% 0.054 230.4)
-
Step 950
950
#142934
oklch(26.9% 0.034 232.8)
#5B9CBC 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) | #8C9ABE | 0.057 |
| Deuteranopia (no green cones) | #7E8FBC | 0.050 |
| Tritanopia (no blue cones) | #22A5A6 | 0.061 |
| Achromatopsia (no color) | #949494 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B9CBC
#5B9CBC
oklch(66.2% 0.082 231.2)
- #BB8464
#BB8464
oklch(66.1% 0.082 51)
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 #5B9CBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.037
- Cadet Blue #5F9EA0 ΔE 0.045
- Faded Blue #658CBB ΔE 0.045
- Silver Lake Blue #778DA9 ΔE 0.049
- Blue Grey #758DA3 ΔE 0.051
- Bluegrey #85A3B2 ΔE 0.055
- Bluey Grey #89A0B0 ΔE 0.057
- Cool Gray #8D99AE ΔE 0.058
Use #5B9CBC 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.