#40D3BC
Closest named color: Medium Turquoise (#48D1CC). oklch(78.5% 0.126 180.1), rgb(64, 211, 188).
Aa
Black text reads best on this color (11.26:1).
About this color
#40D3BC is a light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.126 and its hue 180°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Turquoise (#48D1CC), ΔE 0.026 away. Black text reads best on it, at 11.26:1.
| Hue family | Teals and cyans |
| Lightness | light (78%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Medium Turquoise (#48D1CC) |
| Black text | 11.26:1 |
| White text | 1.86:1 |
Values
| HEX | #40D3BC |
| RGB | rgb(64, 211, 188) |
| HSL | hsl(171, 63%, 54%) |
| OKLCH | oklch(78.5% 0.126 180.1) |
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 #40D3BC | 1.86:1 | Fails | Lc -39.0 | Non-text elements, placeholder text |
| Black text on #40D3BC | 11.26:1 | AAA | Lc 69.1 | Content text, not long reading |
| #40D3BC text on white | 1.86:1 | Fails | Lc 34.8 | Non-text elements, placeholder text |
| #40D3BC text on black | 11.26:1 | AAA | Lc -67.7 | 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 300.
-
Step 50
50
#EAF9F6
oklch(97% 0.016 182.7)
-
Step 100
100
#D1F2EB
oklch(93.5% 0.036 181.3)
-
Step 200
200
#A6E9DB
oklch(88.5% 0.07 180.2)
-
Step 300
300 (this color)
#40D3BC
oklch(78.5% 0.126 180.1)
-
Step 400
400
#00BAA4
oklch(70.7% 0.128 180.3)
-
Step 500
500
#00A08C
oklch(63.2% 0.115 179.7)
-
Step 600
600
#008676
oklch(55.6% 0.1 180.5)
-
Step 700
700
#007163
oklch(49.2% 0.089 180.3)
-
Step 800
800
#005C51
oklch(42.6% 0.077 181.1)
-
Step 900
900
#004D43
oklch(37.7% 0.068 180.3)
-
Step 950
950
#002E27
oklch(27% 0.049 179.5)
#40D3BC 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) | #CAC7BB | 0.133 |
| Deuteranopia (no green cones) | #B5B7BE | 0.127 |
| Tritanopia (no blue cones) | #00D7CC | 0.023 |
| Achromatopsia (no color) | #BEBEBE | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40D3BC
#40D3BC
oklch(78.5% 0.126 180.1)
- #FB95B5
#FB95B5
oklch(78.5% 0.127 0.3)
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 #40D3BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Turquoise #48D1CC ΔE 0.026
- Medium Aquamarine #66CDAA ΔE 0.030
- Seafoam Blue #78D1B6 ΔE 0.037
- Turquoise #40E0D0 ΔE 0.040
- Dark Turquoise #00CED1 ΔE 0.040
- Emerald #06D6A0 ΔE 0.048
- Pale Teal #82CBB2 ΔE 0.048
- Aqua Marine #2EE8BB ΔE 0.060
Use #40D3BC 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.