#3BB5EB
Closest named color: Deep Sky Blue (#00BFFF). oklch(73% 0.13 232), rgb(59, 181, 235).
Aa
Black text reads best on this color (8.99:1).
About this color
#3BB5EB is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.130 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.035 away. Black text reads best on it, at 8.99:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.99:1 |
| White text | 2.33:1 |
Values
| HEX | #3BB5EB |
| RGB | rgb(59, 181, 235) |
| HSL | hsl(198, 81%, 58%) |
| OKLCH | oklch(73% 0.13 232) |
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 #3BB5EB | 2.33:1 | Fails | Lc -50.5 | Large or bold text, headings |
| Black text on #3BB5EB | 8.99:1 | AAA | Lc 58.3 | Large or bold text, headings |
| #3BB5EB text on white | 2.33:1 | Fails | Lc 45.6 | Large or bold text, headings |
| #3BB5EB text on black | 8.99:1 | AAA | Lc -56.4 | 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 400.
-
Step 50
50
#EFF7FC
oklch(97.2% 0.011 234.8)
-
Step 100
100
#DBEDF7
oklch(93.6% 0.023 231.8)
-
Step 200
200
#BCDFF2
oklch(88.4% 0.045 231.7)
-
Step 300
300
#8ACAEC
oklch(80.8% 0.081 232.3)
-
Step 400
400 (this color)
#3BB5EB
oklch(73% 0.13 232)
-
Step 500
500
#0096C9
oklch(63.2% 0.128 231.5)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#004863
oklch(37.7% 0.077 231.8)
-
Step 950
950
#002B3D
oklch(27.1% 0.055 231.9)
#3BB5EB 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) | #9AB3EE | 0.086 |
| Deuteranopia (no green cones) | #82A2EA | 0.073 |
| Tritanopia (no blue cones) | #00C4C7 | 0.079 |
| Achromatopsia (no color) | #AAAAAA | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3BB5EB
#3BB5EB
oklch(73% 0.13 232)
- #E78E55
#E78E55
oklch(72.9% 0.13 52)
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 #3BB5EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.035
- Vivid Sky Blue #4CC9F0 ΔE 0.057
- Bright Sky Blue #02CCFE ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.062
- Carolina Blue #8AB8FE ΔE 0.075
- Lightblue #7BC8F6 ΔE 0.077
- Sky #82CAFC ΔE 0.087
- Greyblue #77A1B5 ΔE 0.088
Use #3BB5EB 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.