#21706C
Closest named color: Dark Aquamarine (#017371). oklch(49.7% 0.075 190.1), rgb(33, 112, 108).
Aa
White text reads best on this color (5.83:1).
About this color
#21706C is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 50%, its chroma 0.075 and its hue 190°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aquamarine (#017371), ΔE 0.013 away. White text reads best on it, at 5.83:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dark Aquamarine (#017371) |
| Black text | 3.59:1 |
| White text | 5.83:1 |
Values
| HEX | #21706C |
| RGB | rgb(33, 112, 108) |
| HSL | hsl(177, 54%, 28%) |
| OKLCH | oklch(49.7% 0.075 190.1) |
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 #21706C | 5.83:1 | AA | Lc -84.1 | Fine for body text |
| Black text on #21706C | 3.59:1 | AA large text | Lc 25.2 | Dividers and decoration only |
| #21706C text on white | 5.83:1 | AA | Lc 78.9 | Fine for body text |
| #21706C text on black | 3.59:1 | AA large text | Lc -22.9 | 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 700.
-
Step 50
50
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E2ECEB
oklch(93.5% 0.011 189.8)
-
Step 200
200
#CBDEDC
oklch(88.6% 0.02 189.2)
-
Step 300
300
#A7C9C6
oklch(81% 0.037 189.9)
-
Step 400
400
#76ADA9
oklch(70.8% 0.058 190.2)
-
Step 500
500
#4F9893
oklch(63.1% 0.074 189.6)
-
Step 600
600
#2D827E
oklch(55.5% 0.08 190.7)
-
Step 700
700 (this color)
#21706C
oklch(49.7% 0.075 190.1)
-
Step 800
800
#1C5A57
oklch(42.8% 0.062 190.5)
-
Step 900
900
#1E4A47
oklch(37.7% 0.049 189.3)
-
Step 950
950
#132B2A
oklch(26.9% 0.03 192)
#21706C 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) | #696A6C | 0.078 |
| Deuteranopia (no green cones) | #5E616D | 0.075 |
| Tritanopia (no blue cones) | #00736F | 0.012 |
| Achromatopsia (no color) | #656565 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21706C
#21706C
oklch(49.7% 0.075 190.1)
- #875059
#875059
oklch(49.7% 0.075 9.6)
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 #21706C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aquamarine #017371 ΔE 0.013
- Deep Turquoise #017374 ΔE 0.015
- Dark Aqua #05696B ΔE 0.027
- Bluegreen #017A79 ΔE 0.031
- Deep Aqua #08787F ΔE 0.032
- Dark Green Blue #1F6357 ΔE 0.046
- Teal #008080 ΔE 0.050
- Slate #516572 ΔE 0.058
Use #21706C 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.