#21816A
Closest named color: Teal (#008080). oklch(54.3% 0.094 172.8), rgb(33, 129, 106).
Aa
White text reads best on this color (4.75:1).
About this color
#21816A is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 54%, its chroma 0.094 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Teal (#008080), ΔE 0.036 away. White text reads best on it, at 4.75:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Teal (#008080) |
| Black text | 4.41:1 |
| White text | 4.75:1 |
Values
| HEX | #21816A |
| RGB | rgb(33, 129, 106) |
| HSL | hsl(166, 59%, 32%) |
| OKLCH | oklch(54.3% 0.094 172.8) |
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 #21816A | 4.75:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #21816A | 4.41:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #21816A text on white | 4.75:1 | AA | Lc 72.7 | Content text, not long reading |
| #21816A text on black | 4.41:1 | AA large text | Lc -29.0 | Dividers and decoration only |
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 600.
-
Step 50
50
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E2EDE9
oklch(93.7% 0.013 172.4)
-
Step 200
200
#CADED7
oklch(88.4% 0.023 172.8)
-
Step 300
300
#A6CABE
oklch(80.9% 0.042 173)
-
Step 400
400
#73AF9C
oklch(70.7% 0.069 172.3)
-
Step 500
500
#4B9B84
oklch(63.2% 0.087 172.3)
-
Step 600
600 (this color)
#21816A
oklch(54.3% 0.094 172.8)
-
Step 700
700
#17715C
oklch(49.2% 0.088 172.7)
-
Step 800
800
#175C4B
oklch(42.8% 0.073 172.6)
-
Step 900
900
#1C4B3F
oklch(37.6% 0.055 173.8)
-
Step 950
950
#122C25
oklch(27% 0.035 173.9)
#21816A 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) | #7D7869 | 0.098 |
| Deuteranopia (no green cones) | #706F6C | 0.093 |
| Tritanopia (no blue cones) | #00827A | 0.024 |
| Achromatopsia (no color) | #737373 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21816A
#21816A
oklch(54.3% 0.094 172.8)
- #995774
#995774
oklch(54.2% 0.094 352.9)
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 #21816A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal #008080 ΔE 0.036
- Bluegreen #017A79 ΔE 0.038
- Sea Green #2E8B57 ΔE 0.048
- Dark Cyan #008B8B ΔE 0.050
- Deep Aqua #08787F ΔE 0.051
- Viridian #1E9167 ΔE 0.052
- Dark Aquamarine #017371 ΔE 0.052
- Deep Turquoise #017374 ΔE 0.054
Use #21816A 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.