#40BDF5
Closest named color: Deep Sky Blue (#00BFFF). oklch(75.4% 0.134 232.2), rgb(64, 189, 245).
Aa
Black text reads best on this color (9.81:1).
About this color
#40BDF5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.134 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.020 away. Black text reads best on it, at 9.81:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.81:1 |
| White text | 2.13:1 |
Values
| HEX | #40BDF5 |
| RGB | rgb(64, 189, 245) |
| HSL | hsl(199, 90%, 61%) |
| OKLCH | oklch(75.4% 0.134 232.2) |
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 #40BDF5 | 2.13:1 | Fails | Lc -46.3 | Large or bold text, headings |
| Black text on #40BDF5 | 9.81:1 | AAA | Lc 62.3 | Content text, not long reading |
| #40BDF5 text on white | 2.13:1 | Fails | Lc 41.6 | Non-text elements, placeholder text |
| #40BDF5 text on black | 9.81:1 | AAA | Lc -60.6 | Content text, not long reading |
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
#EEF7FC
oklch(97.1% 0.012 231.7)
-
Step 100
100
#DBEDF8
oklch(93.6% 0.024 234.4)
-
Step 200
200
#BCDFF3
oklch(88.5% 0.046 233.1)
-
Step 300
300
#88CBEE
oklch(81% 0.084 232)
-
Step 400
400 (this color)
#40BDF5
oklch(75.4% 0.134 232.2)
-
Step 500
500
#0096CA
oklch(63.2% 0.129 232.1)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006A90
oklch(49.2% 0.1 232)
-
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)
#40BDF5 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) | #A1BBF8 | 0.088 |
| Deuteranopia (no green cones) | #89AAF4 | 0.074 |
| Tritanopia (no blue cones) | #00CCD0 | 0.080 |
| Achromatopsia (no color) | #B1B1B1 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40BDF5
#40BDF5
oklch(75.4% 0.134 232.2)
- #F1955A
#F1955A
oklch(75.3% 0.134 52.1)
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 #40BDF5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.020
- Vivid Sky Blue #4CC9F0 ΔE 0.038
- Bright Sky Blue #02CCFE ΔE 0.040
- Lightblue #7BC8F6 ΔE 0.057
- Carolina Blue #8AB8FE ΔE 0.064
- Sky #82CAFC ΔE 0.067
- Light Sky Blue #87CEFA ΔE 0.078
- Turquoise Blue #06B1C4 ΔE 0.079
Use #40BDF5 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.