#40C5A3
Closest named color: Greenblue (#23C48B). oklch(74.3% 0.125 172.2), rgb(64, 197, 163).
Aa
Black text reads best on this color (9.73:1).
About this color
#40C5A3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.125 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Greenblue (#23C48B), ΔE 0.037 away. Black text reads best on it, at 9.73:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Greenblue (#23C48B) |
| Black text | 9.73:1 |
| White text | 2.15:1 |
Values
| HEX | #40C5A3 |
| RGB | rgb(64, 197, 163) |
| HSL | hsl(165, 53%, 51%) |
| OKLCH | oklch(74.3% 0.125 172.2) |
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 #40C5A3 | 2.15:1 | Fails | Lc -46.7 | Large or bold text, headings |
| Black text on #40C5A3 | 9.73:1 | AAA | Lc 61.9 | Content text, not long reading |
| #40C5A3 text on white | 2.15:1 | Fails | Lc 42.0 | Non-text elements, placeholder text |
| #40C5A3 text on black | 9.73:1 | AAA | Lc -60.2 | 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 400.
-
Step 50
50
#EFF8F5
oklch(97.2% 0.01 174.3)
-
Step 100
100
#DCEFE8
oklch(93.6% 0.022 171.8)
-
Step 200
200
#BDE3D6
oklch(88.5% 0.044 172.5)
-
Step 300
300
#8BD1BB
oklch(80.8% 0.077 172.5)
-
Step 400
400 (this color)
#40C5A3
oklch(74.3% 0.125 172.2)
-
Step 500
500
#00A181
oklch(63.2% 0.122 172)
-
Step 600
600
#00876C
oklch(55.5% 0.108 172.1)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#004E3D
oklch(37.8% 0.073 171.8)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#40C5A3 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) | #BFB8A1 | 0.129 |
| Deuteranopia (no green cones) | #ADABA5 | 0.124 |
| Tritanopia (no blue cones) | #00C7BB | 0.034 |
| Achromatopsia (no color) | #B0B0B0 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40C5A3
#40C5A3
oklch(74.3% 0.125 172.2)
- #E889B4
#E889B4
oklch(74.3% 0.126 352)
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 #40C5A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greenblue #23C48B ΔE 0.037
- Medium Aquamarine #66CDAA ΔE 0.038
- Green Blue #01C08D ΔE 0.039
- Topaz #13BBAF ΔE 0.042
- Greeny Blue #42B395 ΔE 0.050
- Emerald #06D6A0 ΔE 0.051
- Soft Green #6FC276 ΔE 0.060
- Medium Turquoise #48D1CC ΔE 0.060
Use #40C5A3 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.