#5BB3F4
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.9% 0.127 243.1), rgb(91, 179, 244).
Aa
Black text reads best on this color (9.19:1).
About this color
#5BB3F4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.127 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 9.19:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.19:1 |
| White text | 2.28:1 |
Values
| HEX | #5BB3F4 |
| RGB | rgb(91, 179, 244) |
| HSL | hsl(205, 87%, 66%) |
| OKLCH | oklch(73.9% 0.127 243.1) |
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 #5BB3F4 | 2.28:1 | Fails | Lc -49.6 | Large or bold text, headings |
| Black text on #5BB3F4 | 9.19:1 | AAA | Lc 59.2 | Large or bold text, headings |
| #5BB3F4 text on white | 2.28:1 | Fails | Lc 44.8 | Non-text elements, placeholder text |
| #5BB3F4 text on black | 9.19:1 | 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
#C1DDF5
oklch(88.5% 0.045 244.2)
-
Step 300
300
#94C7F0
oklch(80.9% 0.079 243.2)
-
Step 400
400 (this color)
#5BB3F4
oklch(73.9% 0.127 243.1)
-
Step 500
500
#0091DD
oklch(63.1% 0.152 242.9)
-
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
#00466E
oklch(37.8% 0.091 242.8)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#5BB3F4 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) | #96B4F7 | 0.061 |
| Deuteranopia (no green cones) | #81A5F3 | 0.048 |
| Tritanopia (no blue cones) | #00C3C9 | 0.096 |
| Achromatopsia (no color) | #ACACAC | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5BB3F4
#5BB3F4
oklch(73.9% 0.127 243.1)
- #E3984E
#E3984E
oklch(74.1% 0.127 63.2)
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 #5BB3F4, 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
- Periwinkle Blue #8F99FB ΔE 0.085
Use #5BB3F4 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.