#21997C
Closest named color: Ocean Green (#3D9973). oklch(61.2% 0.111 171.8), rgb(33, 153, 124).
Aa
Black text reads best on this color (5.91:1).
About this color
#21997C is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 61%, its chroma 0.111 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Green (#3D9973), ΔE 0.018 away. Black text reads best on it, at 5.91:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Ocean Green (#3D9973) |
| Black text | 5.91:1 |
| White text | 3.55:1 |
Values
| HEX | #21997C |
| RGB | rgb(33, 153, 124) |
| HSL | hsl(166, 65%, 36%) |
| OKLCH | oklch(61.2% 0.111 171.8) |
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 #21997C | 3.55:1 | AA large text | Lc -68.2 | Content text, not long reading |
| Black text on #21997C | 5.91:1 | AA | Lc 41.4 | Non-text elements, placeholder text |
| #21997C text on white | 3.55:1 | AA large text | Lc 62.7 | Content text, not long reading |
| #21997C text on black | 5.91:1 | AA | Lc -39.0 | Non-text elements, placeholder text |
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
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E0EDE8
oklch(93.5% 0.015 171)
-
Step 200
200
#C6E0D7
oklch(88.5% 0.03 172.8)
-
Step 300
300
#9ECCBC
oklch(80.8% 0.053 171.6)
-
Step 400
400
#63B29A
oklch(70.6% 0.087 172)
-
Step 500
500 (this color)
#21997C
oklch(61.2% 0.111 171.8)
-
Step 600
600
#00876C
oklch(55.5% 0.108 172.1)
-
Step 700
700
#00725A
oklch(49.2% 0.096 171.5)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#024E3D
oklch(37.8% 0.073 171.6)
-
Step 950
950
#082E24
oklch(27.2% 0.046 171.6)
#21997C 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) | #948E7B | 0.114 |
| Deuteranopia (no green cones) | #85837E | 0.110 |
| Tritanopia (no blue cones) | #009A91 | 0.030 |
| Achromatopsia (no color) | #888888 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21997C
#21997C
oklch(61.2% 0.111 171.8)
- #B6668B
#B6668B
oklch(61.2% 0.112 351.7)
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 #21997C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Green #3D9973 ΔE 0.018
- Blue Green #0F9B8E ΔE 0.025
- Persian Green #2A9D8F ΔE 0.029
- Viridian #1E9167 ΔE 0.034
- Sea #3C9992 ΔE 0.039
- Dusty Teal #4C9085 ΔE 0.043
- Jade #1FA774 ΔE 0.048
- Teal Green #0A9396 ΔE 0.049
Use #21997C 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.