#5BB7FB
Closest named color: Deep Sky Blue (#00BFFF). oklch(75.1% 0.132 243.2), rgb(91, 183, 251).
Aa
Black text reads best on this color (9.61:1).
About this color
#5BB7FB is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.132 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.036 away. Black text reads best on it, at 9.61:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.61:1 |
| White text | 2.18:1 |
Values
| HEX | #5BB7FB |
| RGB | rgb(91, 183, 251) |
| HSL | hsl(206, 95%, 67%) |
| OKLCH | oklch(75.1% 0.132 243.2) |
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 #5BB7FB | 2.18:1 | Fails | Lc -47.4 | Large or bold text, headings |
| Black text on #5BB7FB | 9.61:1 | AAA | Lc 61.2 | Content text, not long reading |
| #5BB7FB text on white | 2.18:1 | Fails | Lc 42.7 | Non-text elements, placeholder text |
| #5BB7FB text on black | 9.61:1 | AAA | Lc -59.5 | 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
#EFF6FC
oklch(97% 0.011 243.7)
-
Step 100
100
#DDECF9
oklch(93.6% 0.024 244.1)
-
Step 200
200
#C0DDF6
oklch(88.4% 0.046 244.3)
-
Step 300
300
#92C7F2
oklch(80.8% 0.082 243.5)
-
Step 400
400 (this color)
#5BB7FB
oklch(75.1% 0.132 243.2)
-
Step 500
500
#0091DE
oklch(63.1% 0.153 243.2)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#5BB7FB 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) | #99B8FE | 0.063 |
| Deuteranopia (no green cones) | #83A8FA | 0.051 |
| Tritanopia (no blue cones) | #00C8CF | 0.098 |
| Achromatopsia (no color) | #AFAFAF | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BB7FB
#5BB7FB
oklch(75.1% 0.132 243.2)
- #E99B4D
#E99B4D
oklch(75.3% 0.132 63.3)
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 #5BB7FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.036
- Carolina Blue #8AB8FE ΔE 0.046
- Vivid Sky Blue #4CC9F0 ΔE 0.056
- Lightblue #7BC8F6 ΔE 0.060
- Bright Sky Blue #02CCFE ΔE 0.060
- Sky #82CAFC ΔE 0.067
- Pastel Blue #A2BFFE ΔE 0.079
- Light Sky Blue #87CEFA ΔE 0.080
Use #5BB7FB 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.