#40B4DB
Closest named color: Turquoise Blue (#06B1C4). oklch(72.1% 0.116 224.5), rgb(64, 180, 219).
Aa
Black text reads best on this color (8.76:1).
About this color
#40B4DB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.116 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.042 away. Black text reads best on it, at 8.76:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.76:1 |
| White text | 2.39:1 |
Values
| HEX | #40B4DB |
| RGB | rgb(64, 180, 219) |
| HSL | hsl(195, 68%, 55%) |
| OKLCH | oklch(72.1% 0.116 224.5) |
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 #40B4DB | 2.39:1 | Fails | Lc -51.8 | Large or bold text, headings |
| Black text on #40B4DB | 8.76:1 | AAA | Lc 57.1 | Large or bold text, headings |
| #40B4DB text on white | 2.39:1 | Fails | Lc 46.8 | Large or bold text, headings |
| #40B4DB text on black | 8.76:1 | AAA | Lc -55.2 | 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
#EFF7FA
oklch(97.1% 0.009 222.1)
-
Step 100
100
#DCEDF4
oklch(93.6% 0.02 224.3)
-
Step 200
200
#BEDFED
oklch(88.4% 0.04 225.4)
-
Step 300
300
#8DCBE4
oklch(80.9% 0.072 225.1)
-
Step 400
400 (this color)
#40B4DB
oklch(72.1% 0.116 224.5)
-
Step 500
500
#0098BF
oklch(63.2% 0.119 224.4)
-
Step 600
600
#007FA1
oklch(55.5% 0.105 225)
-
Step 700
700
#006B88
oklch(49.1% 0.093 224.9)
-
Step 800
800
#005870
oklch(42.8% 0.081 224.4)
-
Step 900
900
#00495E
oklch(37.7% 0.071 225)
-
Step 950
950
#002B39
oklch(26.9% 0.051 225.5)
#40B4DB 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) | #9EB0DD | 0.089 |
| Deuteranopia (no green cones) | #89A1DB | 0.079 |
| Tritanopia (no blue cones) | #00C0C1 | 0.062 |
| Achromatopsia (no color) | #A7A7A7 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B4DB
#40B4DB
oklch(72.1% 0.116 224.5)
- #E18C67
#E18C67
oklch(72% 0.116 44)
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 #40B4DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.042
- Deep Sky Blue #00BFFF ΔE 0.053
- Vivid Sky Blue #4CC9F0 ΔE 0.061
- Bright Sky Blue #02CCFE ΔE 0.071
- Greyblue #77A1B5 ΔE 0.072
- Light Sea Green #20B2AA ΔE 0.076
- Topaz #13BBAF ΔE 0.078
- Dark Turquoise #00CED1 ΔE 0.080
Use #40B4DB 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.