#5B9BBF
Closest named color: Greyblue (#77A1B5). oklch(66.1% 0.085 234.7), rgb(91, 155, 191).
Aa
Black text reads best on this color (6.88:1).
About this color
#5B9BBF is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.085 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.040 away. Black text reads best on it, at 6.88:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 6.88:1 |
| White text | 3.04:1 |
Values
| HEX | #5B9BBF |
| RGB | rgb(91, 155, 191) |
| HSL | hsl(202, 44%, 55%) |
| OKLCH | oklch(66.1% 0.085 234.7) |
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 #5B9BBF | 3.04:1 | AA large text | Lc -62.6 | Content text, not long reading |
| Black text on #5B9BBF | 6.88:1 | AA | Lc 46.9 | Large or bold text, headings |
| #5B9BBF text on white | 3.04:1 | AA large text | Lc 57.2 | Large or bold text, headings |
| #5B9BBF text on black | 6.88:1 | AA | Lc -44.6 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A7C6D8
oklch(81% 0.042 233.5)
-
Step 400
400
#77A8C4
oklch(70.7% 0.066 234)
-
Step 500
500 (this color)
#5B9BBF
oklch(66.1% 0.085 234.7)
-
Step 600
600
#337CA1
oklch(55.7% 0.092 234)
-
Step 700
700
#25688A
oklch(49.1% 0.086 234.7)
-
Step 800
800
#215570
oklch(42.7% 0.071 234.6)
-
Step 900
900
#21465B
oklch(37.7% 0.056 235.7)
-
Step 950
950
#142935
oklch(26.9% 0.035 235.2)
#5B9BBF 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) | #8A9AC1 | 0.054 |
| Deuteranopia (no green cones) | #7C8FBE | 0.046 |
| Tritanopia (no blue cones) | #1EA5A7 | 0.066 |
| Achromatopsia (no color) | #949494 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B9BBF
#5B9BBF
oklch(66.1% 0.085 234.7)
- #BB845F
#BB845F
oklch(66% 0.085 54.6)
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 #5B9BBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.040
- Faded Blue #658CBB ΔE 0.041
- Silver Lake Blue #778DA9 ΔE 0.049
- Cadet Blue #5F9EA0 ΔE 0.051
- Blue Grey #758DA3 ΔE 0.052
- Bluegrey #85A3B2 ΔE 0.059
- Dusty Blue #5A86AD ΔE 0.060
- Bluey Grey #89A0B0 ΔE 0.060
Use #5B9BBF 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.