#40A39F
Closest named color: Cadet Blue (#5F9EA0). oklch(65.7% 0.091 191.4), rgb(64, 163, 159).
Aa
Black text reads best on this color (6.95:1).
About this color
#40A39F is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.091 and its hue 191°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.028 away. Black text reads best on it, at 6.95:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.95:1 |
| White text | 3.01:1 |
Values
| HEX | #40A39F |
| RGB | rgb(64, 163, 159) |
| HSL | hsl(178, 44%, 45%) |
| OKLCH | oklch(65.7% 0.091 191.4) |
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 #40A39F | 3.01:1 | AA large text | Lc -62.0 | Content text, not long reading |
| Black text on #40A39F | 6.95:1 | AA | Lc 47.4 | Large or bold text, headings |
| #40A39F text on white | 3.01:1 | AA large text | Lc 56.7 | Large or bold text, headings |
| #40A39F text on black | 6.95:1 | AA | Lc -45.1 | 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 500.
-
Step 50
50
#F1F7F6
oklch(97.1% 0.006 185.3)
-
Step 100
100
#E1EDEC
oklch(93.7% 0.013 190.9)
-
Step 200
200
#C7DFDD
oklch(88.5% 0.026 190.6)
-
Step 300
300
#A0CAC8
oklch(80.8% 0.044 192.7)
-
Step 400
400
#69AFAC
oklch(70.7% 0.071 192.2)
-
Step 500
500 (this color)
#40A39F
oklch(65.7% 0.091 191.4)
-
Step 600
600
#008581
oklch(55.7% 0.096 191.1)
-
Step 700
700
#00706C
oklch(49.2% 0.085 190.4)
-
Step 800
800
#005B59
oklch(42.6% 0.073 192.2)
-
Step 900
900
#0D4B49
oklch(37.5% 0.059 191.6)
-
Step 950
950
#0B2C2B
oklch(26.9% 0.038 192.3)
#40A39F 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) | #9A9B9F | 0.097 |
| Deuteranopia (no green cones) | #8A90A0 | 0.090 |
| Tritanopia (no blue cones) | #00A7A1 | 0.022 |
| Achromatopsia (no color) | #949494 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40A39F
#40A39F
oklch(65.7% 0.091 191.4)
- #C27983
#C27983
oklch(65.6% 0.092 11)
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 #40A39F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.028
- Dull Teal #5F9E8F ΔE 0.030
- Sea #3C9992 ΔE 0.031
- Persian Green #2A9D8F ΔE 0.032
- Grey Teal #5E9B8A ΔE 0.036
- Blue Green #0F9B8E ΔE 0.041
- Light Sea Green #20B2AA ΔE 0.041
- Greeny Blue #42B395 ΔE 0.054
Use #40A39F 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.