#5B9DBF
Closest named color: Greyblue (#77A1B5). oklch(66.5% 0.084 232.4), rgb(91, 157, 191).
Aa
Black text reads best on this color (7.01:1).
About this color
#5B9DBF is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.084 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.036 away. Black text reads best on it, at 7.01:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.01:1 |
| White text | 2.99:1 |
Values
| HEX | #5B9DBF |
| RGB | rgb(91, 157, 191) |
| HSL | hsl(200, 44%, 55%) |
| OKLCH | oklch(66.5% 0.084 232.4) |
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 #5B9DBF | 2.99:1 | Fails | Lc -61.8 | Content text, not long reading |
| Black text on #5B9DBF | 7.01:1 | AAA | Lc 47.6 | Large or bold text, headings |
| #5B9DBF text on white | 2.99:1 | Fails | Lc 56.4 | Large or bold text, headings |
| #5B9DBF text on black | 7.01:1 | AAA | Lc -45.4 | 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 500.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A7C6D7
oklch(80.9% 0.041 231.9)
-
Step 400
400
#76A8C3
oklch(70.6% 0.066 232.5)
-
Step 500
500 (this color)
#5B9DBF
oklch(66.5% 0.084 232.4)
-
Step 600
600
#317CA0
oklch(55.6% 0.092 232.7)
-
Step 700
700
#236989
oklch(49.2% 0.085 232.2)
-
Step 800
800
#1F556F
oklch(42.6% 0.071 232.9)
-
Step 900
900
#20475A
oklch(37.8% 0.055 231.9)
-
Step 950
950
#142935
oklch(26.9% 0.035 235.2)
#5B9DBF 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) | #8C9BC1 | 0.056 |
| Deuteranopia (no green cones) | #7E90BF | 0.050 |
| Tritanopia (no blue cones) | #1DA6A8 | 0.063 |
| Achromatopsia (no color) | #959595 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B9DBF
#5B9DBF
oklch(66.5% 0.084 232.4)
- #BD8563
#BD8563
oklch(66.5% 0.084 52.1)
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 #5B9DBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.036
- Faded Blue #658CBB ΔE 0.047
- Cadet Blue #5F9EA0 ΔE 0.048
- Silver Lake Blue #778DA9 ΔE 0.052
- Blue Grey #758DA3 ΔE 0.055
- Bluegrey #85A3B2 ΔE 0.055
- Bluey Grey #89A0B0 ΔE 0.057
- Cool Gray #8D99AE ΔE 0.059
Use #5B9DBF 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.