#21716E
Closest named color: Dark Aquamarine (#017371). oklch(50.1% 0.075 191.4), rgb(33, 113, 110).
Aa
White text reads best on this color (5.75:1).
About this color
#21716E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 50%, its chroma 0.075 and its hue 191°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aquamarine (#017371), ΔE 0.011 away. White text reads best on it, at 5.75:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dark Aquamarine (#017371) |
| Black text | 3.65:1 |
| White text | 5.75:1 |
Values
| HEX | #21716E |
| RGB | rgb(33, 113, 110) |
| HSL | hsl(178, 55%, 29%) |
| OKLCH | oklch(50.1% 0.075 191.4) |
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 #21716E | 5.75:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #21716E | 3.65:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #21716E text on white | 5.75:1 | AA | Lc 78.5 | Fine for body text |
| #21716E text on black | 3.65:1 | AA large text | Lc -23.3 | 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
#75ADA9
oklch(70.8% 0.059 190.3)
-
Step 500
500
#4E9894
oklch(63.1% 0.074 190.8)
-
Step 600
600
#2C827F
oklch(55.5% 0.081 191.8)
-
Step 700
700 (this color)
#21716E
oklch(50.1% 0.075 191.4)
-
Step 800
800
#1B5A57
oklch(42.7% 0.063 190.5)
-
Step 900
900
#1E4A48
oklch(37.8% 0.049 191.3)
-
Step 950
950
#132B2A
oklch(26.9% 0.03 192)
#21716E 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) | #6A6B6E | 0.079 |
| Deuteranopia (no green cones) | #5E626F | 0.075 |
| Tritanopia (no blue cones) | #007470 | 0.012 |
| Achromatopsia (no color) | #666666 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21716E
#21716E
oklch(50.1% 0.075 191.4)
- #895158
#895158
oklch(50.1% 0.075 12.1)
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 #21716E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aquamarine #017371 ΔE 0.011
- Deep Turquoise #017374 ΔE 0.012
- Bluegreen #017A79 ΔE 0.028
- Deep Aqua #08787F ΔE 0.029
- Dark Aqua #05696B ΔE 0.029
- Teal #008080 ΔE 0.046
- Dark Green Blue #1F6357 ΔE 0.050
- Ocean #017B92 ΔE 0.056
Use #21716E 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.