#5BB9EF
Closest named color: Deep Sky Blue (#00BFFF). oklch(75% 0.118 236.5), rgb(91, 185, 239).
Aa
Black text reads best on this color (9.63:1).
About this color
#5BB9EF is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.118 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.037 away. Black text reads best on it, at 9.63:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.63:1 |
| White text | 2.18:1 |
Values
| HEX | #5BB9EF |
| RGB | rgb(91, 185, 239) |
| HSL | hsl(202, 82%, 65%) |
| OKLCH | oklch(75% 0.118 236.5) |
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 #5BB9EF | 2.18:1 | Fails | Lc -47.4 | Large or bold text, headings |
| Black text on #5BB9EF | 9.63:1 | AAA | Lc 61.3 | Content text, not long reading |
| #5BB9EF text on white | 2.18:1 | Fails | Lc 42.6 | Non-text elements, placeholder text |
| #5BB9EF text on black | 9.63:1 | AAA | Lc -59.6 | 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
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DDECF7
oklch(93.5% 0.022 239.4)
-
Step 200
200
#C0DEF1
oklch(88.5% 0.041 235.7)
-
Step 300
300
#93C9EB
oklch(81% 0.074 236.5)
-
Step 400
400 (this color)
#5BB9EF
oklch(75% 0.118 236.5)
-
Step 500
500
#0094D1
oklch(63.1% 0.137 236.6)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#5BB9EF 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) | #A0B8F2 | 0.071 |
| Deuteranopia (no green cones) | #8BA9EE | 0.059 |
| Tritanopia (no blue cones) | #00C7CB | 0.083 |
| Achromatopsia (no color) | #B0B0B0 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BB9EF
#5BB9EF
oklch(75% 0.118 236.5)
- #E79A60
#E79A60
oklch(75.1% 0.119 56.7)
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 #5BB9EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.037
- Vivid Sky Blue #4CC9F0 ΔE 0.044
- Carolina Blue #8AB8FE ΔE 0.052
- Lightblue #7BC8F6 ΔE 0.053
- Bright Sky Blue #02CCFE ΔE 0.054
- Sky #82CAFC ΔE 0.063
- Light Cornflower Blue #98C1D9 ΔE 0.074
- Light Sky Blue #87CEFA ΔE 0.074
Use #5BB9EF 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.