#21756F
Closest named color: Dark Aquamarine (#017371). oklch(51.2% 0.078 188.1), rgb(33, 117, 111).
Aa
White text reads best on this color (5.47:1).
About this color
#21756F is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 51%, its chroma 0.078 and its hue 188°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aquamarine (#017371), ΔE 0.014 away. White text reads best on it, at 5.47:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Dark Aquamarine (#017371) |
| Black text | 3.83:1 |
| White text | 5.47:1 |
Values
| HEX | #21756F |
| RGB | rgb(33, 117, 111) |
| HSL | hsl(176, 56%, 29%) |
| OKLCH | oklch(51.2% 0.078 188.1) |
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 #21756F | 5.47:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #21756F | 3.83:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #21756F text on white | 5.47:1 | AA | Lc 77.0 | Fine for body text |
| #21756F text on black | 3.83:1 | AA large text | Lc -24.8 | 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
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEB
oklch(93.5% 0.011 189.8)
-
Step 200
200
#CADEDC
oklch(88.5% 0.022 189.5)
-
Step 300
300
#A6C9C5
oklch(80.9% 0.038 187.9)
-
Step 400
400
#74ADA8
oklch(70.7% 0.06 189)
-
Step 500
500
#4B9992
oklch(63.2% 0.078 187.7)
-
Step 600
600
#28837C
oklch(55.6% 0.084 187.6)
-
Step 700
700 (this color)
#21756F
oklch(51.2% 0.078 188.1)
-
Step 800
800
#185A56
oklch(42.6% 0.065 189.1)
-
Step 900
900
#1C4A47
oklch(37.6% 0.05 189.4)
-
Step 950
950
#122C29
oklch(27.1% 0.033 185.7)
#21756F 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) | #6E6E6F | 0.083 |
| Deuteranopia (no green cones) | #626570 | 0.079 |
| Tritanopia (no blue cones) | #007873 | 0.012 |
| Achromatopsia (no color) | #696969 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21756F
#21756F
oklch(51.2% 0.078 188.1)
- #8D535E
#8D535E
oklch(51.2% 0.078 8)
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 #21756F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aquamarine #017371 ΔE 0.014
- Deep Turquoise #017374 ΔE 0.016
- Bluegreen #017A79 ΔE 0.019
- Deep Aqua #08787F ΔE 0.024
- Teal #008080 ΔE 0.036
- Dark Aqua #05696B ΔE 0.041
- Ocean #017B92 ΔE 0.053
- Dark Green Blue #1F6357 ΔE 0.060
Use #21756F 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.