#5BB3F3
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.9% 0.126 242.6), rgb(91, 179, 243).
Aa
Black text reads best on this color (9.18:1).
About this color
#5BB3F3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.126 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.042 away. Black text reads best on it, at 9.18:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.18:1 |
| White text | 2.28:1 |
Values
| HEX | #5BB3F3 |
| RGB | rgb(91, 179, 243) |
| HSL | hsl(205, 86%, 65%) |
| OKLCH | oklch(73.9% 0.126 242.6) |
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 #5BB3F3 | 2.28:1 | Fails | Lc -49.7 | Large or bold text, headings |
| Black text on #5BB3F3 | 9.18:1 | AAA | Lc 59.1 | Large or bold text, headings |
| #5BB3F3 text on white | 2.28:1 | Fails | Lc 44.8 | Non-text elements, placeholder text |
| #5BB3F3 text on black | 9.18:1 | AAA | Lc -57.3 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DDECF8
oklch(93.5% 0.023 241.9)
-
Step 200
200
#C1DDF4
oklch(88.4% 0.044 243)
-
Step 300
300
#94C7F0
oklch(80.9% 0.079 243.2)
-
Step 400
400 (this color)
#5BB3F3
oklch(73.9% 0.126 242.6)
-
Step 500
500
#0091DD
oklch(63.1% 0.152 242.9)
-
Step 600
600
#007ABA
oklch(55.6% 0.133 242.5)
-
Step 700
700
#00669D
oklch(49% 0.118 242.7)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#00466D
oklch(37.8% 0.09 242.2)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#5BB3F3 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) | #96B4F6 | 0.061 |
| Deuteranopia (no green cones) | #82A5F2 | 0.049 |
| Tritanopia (no blue cones) | #00C3C9 | 0.094 |
| Achromatopsia (no color) | #ABABAB | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BB3F3
#5BB3F3
oklch(73.9% 0.126 242.6)
- #E2974F
#E2974F
oklch(73.8% 0.126 62.5)
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 #5BB3F3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.042
- Carolina Blue #8AB8FE ΔE 0.052
- Vivid Sky Blue #4CC9F0 ΔE 0.062
- Lightblue #7BC8F6 ΔE 0.068
- Bright Sky Blue #02CCFE ΔE 0.068
- Sky #82CAFC ΔE 0.076
- Cornflower Blue #6495ED ΔE 0.079
- Turquoise Blue #06B1C4 ΔE 0.084
Use #5BB3F3 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.