#40B5BF
Closest named color: Turquoise Blue (#06B1C4). oklch(71.3% 0.103 203.2), rgb(64, 181, 191).
Aa
Black text reads best on this color (8.57:1).
About this color
#40B5BF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 71%, its chroma 0.103 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.025 away. Black text reads best on it, at 8.57:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.57:1 |
| White text | 2.44:1 |
Values
| HEX | #40B5BF |
| RGB | rgb(64, 181, 191) |
| HSL | hsl(185, 50%, 50%) |
| OKLCH | oklch(71.3% 0.103 203.2) |
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 #40B5BF | 2.44:1 | Fails | Lc -52.8 | Large or bold text, headings |
| Black text on #40B5BF | 8.57:1 | AAA | Lc 56.2 | Large or bold text, headings |
| #40B5BF text on white | 2.44:1 | Fails | Lc 47.8 | Large or bold text, headings |
| #40B5BF text on black | 8.57:1 | AAA | Lc -54.2 | 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
#EFF7F8
oklch(97% 0.009 205.9)
-
Step 100
100
#DCEEEF
oklch(93.6% 0.019 200.9)
-
Step 200
200
#BFE1E4
oklch(88.6% 0.036 203.1)
-
Step 300
300
#8ECDD3
oklch(80.8% 0.065 203.5)
-
Step 400
400 (this color)
#40B5BF
oklch(71.3% 0.103 203.2)
-
Step 500
500
#009CA6
oklch(63.1% 0.107 202.8)
-
Step 600
600
#00838C
oklch(55.6% 0.095 203.3)
-
Step 700
700
#006E76
oklch(49.1% 0.084 203.6)
-
Step 800
800
#005A61
oklch(42.6% 0.073 204)
-
Step 900
900
#004B51
oklch(37.6% 0.064 204)
-
Step 950
950
#002D30
oklch(27% 0.046 201.8)
#40B5BF 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) | #A7AEC0 | 0.103 |
| Deuteranopia (no green cones) | #94A0BF | 0.094 |
| Tritanopia (no blue cones) | #00BCB8 | 0.030 |
| Achromatopsia (no color) | #A6A6A6 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40B5BF
#40B5BF
oklch(71.3% 0.103 203.2)
- #DB8884
#DB8884
oklch(71.2% 0.103 22.9)
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 #40B5BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.025
- Light Sea Green #20B2AA ΔE 0.036
- Topaz #13BBAF ΔE 0.038
- Greeny Blue #42B395 ΔE 0.061
- Greyblue #77A1B5 ΔE 0.065
- Dark Turquoise #00CED1 ΔE 0.067
- Cadet Blue #5F9EA0 ΔE 0.067
- Bluegrey #85A3B2 ΔE 0.071
Use #40B5BF 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.