#40A599
Closest named color: Dull Teal (#5F9E8F). oklch(66% 0.095 184.4), rgb(64, 165, 153).
Aa
Black text reads best on this color (7.06:1).
About this color
#40A599 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.095 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Teal (#5F9E8F), ΔE 0.029 away. Black text reads best on it, at 7.06:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Dull Teal (#5F9E8F) |
| Black text | 7.06:1 |
| White text | 2.97:1 |
Values
| HEX | #40A599 |
| RGB | rgb(64, 165, 153) |
| HSL | hsl(173, 44%, 45%) |
| OKLCH | oklch(66% 0.095 184.4) |
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 #40A599 | 2.97:1 | Fails | Lc -61.4 | Content text, not long reading |
| Black text on #40A599 | 7.06:1 | AAA | Lc 48.0 | Large or bold text, headings |
| #40A599 text on white | 2.97:1 | Fails | Lc 56.1 | Large or bold text, headings |
| #40A599 text on black | 7.06:1 | AAA | Lc -45.7 | 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
#E1EDEB
oklch(93.7% 0.013 185.1)
-
Step 200
200
#C7DFDB
oklch(88.5% 0.026 184.7)
-
Step 300
300
#A0CBC4
oklch(80.9% 0.046 184.1)
-
Step 400
400
#68B0A6
oklch(70.7% 0.074 184.4)
-
Step 500
500 (this color)
#40A599
oklch(66% 0.095 184.4)
-
Step 600
600
#00867A
oklch(55.7% 0.099 183.9)
-
Step 700
700
#007067
oklch(49% 0.086 185.2)
-
Step 800
800
#005C54
oklch(42.7% 0.075 184.7)
-
Step 900
900
#0C4C45
oklch(37.7% 0.062 183.8)
-
Step 950
950
#0B2D29
oklch(27.1% 0.04 184.4)
#40A599 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) | #9D9C99 | 0.101 |
| Deuteranopia (no green cones) | #8E919A | 0.095 |
| Tritanopia (no blue cones) | #00A8A1 | 0.021 |
| Achromatopsia (no color) | #969696 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40A599
#40A599
oklch(66% 0.095 184.4)
- #C3798B
#C3798B
oklch(66% 0.095 4.2)
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 #40A599, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Teal #5F9E8F ΔE 0.029
- Persian Green #2A9D8F ΔE 0.030
- Grey Teal #5E9B8A ΔE 0.034
- Sea #3C9992 ΔE 0.035
- Cadet Blue #5F9EA0 ΔE 0.035
- Light Sea Green #20B2AA ΔE 0.038
- Blue Green #0F9B8E ΔE 0.041
- Greeny Blue #42B395 ΔE 0.044
Use #40A599 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.