#21636A
Closest named color: Dark Aqua (#05696B). oklch(46.2% 0.066 205.1), rgb(33, 99, 106).
Aa
White text reads best on this color (6.86:1).
About this color
#21636A is a medium-dark, muted teal or cyan. In OKLCH its lightness is 46%, its chroma 0.066 and its hue 205°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.020 away. White text reads best on it, at 6.86:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (46%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.05:1 |
| White text | 6.86:1 |
Values
| HEX | #21636A |
| RGB | rgb(33, 99, 106) |
| HSL | hsl(186, 53%, 27%) |
| OKLCH | oklch(46.2% 0.066 205.1) |
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 #21636A | 6.86:1 | AA | Lc -88.5 | Fine for body text |
| Black text on #21636A | 3.05:1 | AA large text | Lc 20.6 | Dividers and decoration only |
| #21636A text on white | 6.86:1 | AA | Lc 83.5 | Fine for body text |
| #21636A text on black | 3.05:1 | AA large text | Lc -18.5 | 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
#AAC7CA
oklch(80.9% 0.032 204.2)
-
Step 400
400
#7BAAB0
oklch(70.7% 0.051 205.9)
-
Step 500
500
#57959C
oklch(63.1% 0.065 205)
-
Step 600
600
#397F87
oklch(55.5% 0.071 205.4)
-
Step 700
700 (this color)
#21636A
oklch(46.2% 0.066 205.1)
-
Step 800
800
#25585D
oklch(42.8% 0.055 204)
-
Step 900
900
#24484C
oklch(37.7% 0.042 204.9)
-
Step 950
950
#162A2D
oklch(26.9% 0.026 207.9)
#21636A 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) | #5B5F6A | 0.065 |
| Deuteranopia (no green cones) | #50576A | 0.059 |
| Tritanopia (no blue cones) | #006765 | 0.021 |
| Achromatopsia (no color) | #5A5A5A | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21636A
#21636A
oklch(46.2% 0.066 205.1)
- #794A46
#794A46
oklch(46.2% 0.065 25.1)
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 #21636A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.020
- Petrol #005F6A ΔE 0.021
- Dark Green Blue #1F6357 ΔE 0.032
- Deep Turquoise #017374 ΔE 0.048
- Dark Aquamarine #017371 ΔE 0.048
- YInMn Blue #415A77 ΔE 0.050
- Deep Teal #00555A ΔE 0.053
- Slate #516572 ΔE 0.054
Use #21636A 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.