#40A3BF
Closest named color: Turquoise Blue (#06B1C4). oklch(66.9% 0.099 219.9), rgb(64, 163, 191).
Aa
Black text reads best on this color (7.20:1).
About this color
#40A3BF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 67%, its chroma 0.099 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.040 away. Black text reads best on it, at 7.20:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.20:1 |
| White text | 2.91:1 |
Values
| HEX | #40A3BF |
| RGB | rgb(64, 163, 191) |
| HSL | hsl(193, 50%, 50%) |
| OKLCH | oklch(66.9% 0.099 219.9) |
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 #40A3BF | 2.91:1 | Fails | Lc -60.5 | Content text, not long reading |
| Black text on #40A3BF | 7.20:1 | AAA | Lc 48.8 | Large or bold text, headings |
| #40A3BF text on white | 2.91:1 | Fails | Lc 55.2 | Large or bold text, headings |
| #40A3BF text on black | 7.20:1 | AAA | Lc -46.6 | 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
#F0F7F9
oklch(97.1% 0.008 216.6)
-
Step 100
100
#DDEDF2
oklch(93.6% 0.018 218.4)
-
Step 200
200
#C1DFE9
oklch(88.5% 0.035 219.9)
-
Step 300
300
#94CBDC
oklch(81% 0.062 218.9)
-
Step 400
400 (this color)
#40A3BF
oklch(66.9% 0.099 219.9)
-
Step 500
500
#0099B9
oklch(63.1% 0.115 219.7)
-
Step 600
600
#00809C
oklch(55.5% 0.101 220.3)
-
Step 700
700
#006C84
oklch(49.2% 0.09 220.2)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5B
oklch(37.8% 0.069 219.8)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#40A3BF 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) | #929FC1 | 0.083 |
| Deuteranopia (no green cones) | #8092BF | 0.074 |
| Tritanopia (no blue cones) | #00ACAC | 0.049 |
| Achromatopsia (no color) | #979797 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40A3BF
#40A3BF
oklch(66.9% 0.099 219.9)
- #C97F66
#C97F66
oklch(66.8% 0.099 39.4)
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 #40A3BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.040
- Cadet Blue #5F9EA0 ΔE 0.047
- Greyblue #77A1B5 ΔE 0.049
- Light Sea Green #20B2AA ΔE 0.063
- Bluegrey #85A3B2 ΔE 0.067
- Faded Blue #658CBB ΔE 0.067
- Sea #3C9992 ΔE 0.068
- Dull Teal #5F9E8F ΔE 0.070
Use #40A3BF 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.