#5B9FBF
Closest named color: Greyblue (#77A1B5). oklch(67% 0.084 230.1), rgb(91, 159, 191).
Aa
Black text reads best on this color (7.15:1).
About this color
#5B9FBF is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.084 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.033 away. Black text reads best on it, at 7.15:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.15:1 |
| White text | 2.93:1 |
Values
| HEX | #5B9FBF |
| RGB | rgb(91, 159, 191) |
| HSL | hsl(199, 44%, 55%) |
| OKLCH | oklch(67% 0.084 230.1) |
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 #5B9FBF | 2.93:1 | Fails | Lc -61.0 | Content text, not long reading |
| Black text on #5B9FBF | 7.15:1 | AAA | Lc 48.4 | Large or bold text, headings |
| #5B9FBF text on white | 2.93:1 | Fails | Lc 55.7 | Large or bold text, headings |
| #5B9FBF text on black | 7.15:1 | AAA | Lc -46.1 | Large or bold text, headings |
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 400.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C7DDE9
oklch(88.5% 0.029 231.5)
-
Step 300
300
#9FC8DC
oklch(81% 0.052 229.2)
-
Step 400
400 (this color)
#5B9FBF
oklch(67% 0.084 230.1)
-
Step 500
500
#3495BE
oklch(63.2% 0.107 230.3)
-
Step 600
600
#007EA7
oklch(55.5% 0.111 230)
-
Step 700
700
#006A8D
oklch(49.1% 0.098 229.8)
-
Step 800
800
#005774
oklch(42.7% 0.085 229.4)
-
Step 900
900
#0B485F
oklch(37.7% 0.069 229.5)
-
Step 950
950
#0B2A38
oklch(27% 0.044 231.3)
#5B9FBF 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) | #8F9DC1 | 0.060 |
| Deuteranopia (no green cones) | #8192BF | 0.053 |
| Tritanopia (no blue cones) | #1CA8A9 | 0.062 |
| Achromatopsia (no color) | #979797 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B9FBF
#5B9FBF
oklch(67% 0.084 230.1)
- #BF8666
#BF8666
oklch(66.9% 0.084 50.1)
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 #5B9FBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.033
- Cadet Blue #5F9EA0 ΔE 0.046
- Bluegrey #85A3B2 ΔE 0.052
- Faded Blue #658CBB ΔE 0.052
- Bluey Grey #89A0B0 ΔE 0.055
- Silver Lake Blue #778DA9 ΔE 0.055
- Blue Grey #758DA3 ΔE 0.058
- Turquoise Blue #06B1C4 ΔE 0.058
Use #5B9FBF 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.