#21656B
Closest named color: Dark Aqua (#05696B). oklch(46.7% 0.067 203.5), rgb(33, 101, 107).
Aa
White text reads best on this color (6.69:1).
About this color
#21656B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 47%, its chroma 0.067 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.016 away. White text reads best on it, at 6.69:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (47%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.13:1 |
| White text | 6.69:1 |
Values
| HEX | #21656B |
| RGB | rgb(33, 101, 107) |
| HSL | hsl(185, 53%, 27%) |
| OKLCH | oklch(46.7% 0.067 203.5) |
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 #21656B | 6.69:1 | AA | Lc -87.8 | Fine for body text |
| Black text on #21656B | 3.13:1 | AA large text | Lc 21.3 | Dividers and decoration only |
| #21656B text on white | 6.69:1 | AA | Lc 82.8 | Fine for body text |
| #21656B text on black | 3.13:1 | AA large text | Lc -19.1 | 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
#CCDDDE
oklch(88.5% 0.018 201.1)
-
Step 300
300
#A9C7CA
oklch(80.8% 0.033 203.9)
-
Step 400
400
#7AABAF
oklch(70.8% 0.052 202.4)
-
Step 500
500
#56959C
oklch(63% 0.066 204.8)
-
Step 600
600
#388086
oklch(55.7% 0.072 202.7)
-
Step 700
700 (this color)
#21656B
oklch(46.7% 0.067 203.5)
-
Step 800
800
#24585D
oklch(42.8% 0.055 203.9)
-
Step 900
900
#23484C
oklch(37.6% 0.043 204.7)
-
Step 950
950
#152A2C
oklch(26.8% 0.027 203.5)
#21656B 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) | #5D616B | 0.067 |
| Deuteranopia (no green cones) | #52596B | 0.061 |
| Tritanopia (no blue cones) | #006967 | 0.020 |
| Achromatopsia (no color) | #5C5C5C | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21656B
#21656B
oklch(46.7% 0.067 203.5)
- #7C4B48
#7C4B48
oklch(46.9% 0.067 23.7)
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 #21656B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.016
- Petrol #005F6A ΔE 0.026
- Dark Green Blue #1F6357 ΔE 0.032
- Deep Turquoise #017374 ΔE 0.042
- Dark Aquamarine #017371 ΔE 0.042
- Slate #516572 ΔE 0.052
- YInMn Blue #415A77 ΔE 0.053
- Deep Aqua #08787F ΔE 0.058
Use #21656B 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.