#21676F
Closest named color: Dark Aqua (#05696B). oklch(47.4% 0.069 205.9), rgb(33, 103, 111).
Aa
White text reads best on this color (6.49:1).
About this color
#21676F is a medium-dark, muted teal or cyan. In OKLCH its lightness is 47%, its chroma 0.069 and its hue 206°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.015 away. White text reads best on it, at 6.49:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (47%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.23:1 |
| White text | 6.49:1 |
Values
| HEX | #21676F |
| RGB | rgb(33, 103, 111) |
| HSL | hsl(186, 54%, 28%) |
| OKLCH | oklch(47.4% 0.069 205.9) |
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 #21676F | 6.49:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #21676F | 3.23:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #21676F text on white | 6.49:1 | AA | Lc 81.9 | Fine for body text |
| #21676F text on black | 3.23:1 | AA large text | Lc -20.0 | 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 700.
-
Step 50
50
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CCDDDF
oklch(88.5% 0.018 205.3)
-
Step 300
300
#A9C7CB
oklch(80.9% 0.033 206.4)
-
Step 400
400
#79ABB1
oklch(70.8% 0.054 205.4)
-
Step 500
500
#54959E
oklch(63% 0.068 207.1)
-
Step 600
600
#358089
oklch(55.7% 0.074 206.1)
-
Step 700
700 (this color)
#21676F
oklch(47.4% 0.069 205.9)
-
Step 800
800
#22585E
oklch(42.7% 0.057 205.3)
-
Step 900
900
#22484D
oklch(37.6% 0.044 206.7)
-
Step 950
950
#152A2D
oklch(26.9% 0.027 207.4)
#21676F 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) | #5E6370 | 0.067 |
| Deuteranopia (no green cones) | #535A6F | 0.063 |
| Tritanopia (no blue cones) | #006C69 | 0.024 |
| Achromatopsia (no color) | #5E5E5E | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21676F
#21676F
oklch(47.4% 0.069 205.9)
- #7E4C48
#7E4C48
oklch(47.3% 0.069 24.9)
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 #21676F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.015
- Petrol #005F6A ΔE 0.031
- Deep Turquoise #017374 ΔE 0.036
- Dark Aquamarine #017371 ΔE 0.037
- Dark Green Blue #1F6357 ΔE 0.038
- Slate #516572 ΔE 0.049
- Deep Aqua #08787F ΔE 0.051
- YInMn Blue #415A77 ΔE 0.053
Use #21676F 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.