#21646F
Closest named color: Dark Aqua (#05696B). oklch(46.6% 0.068 210.4), rgb(33, 100, 111).
Aa
White text reads best on this color (6.73:1).
About this color
#21646F is a medium-dark, muted teal or cyan. In OKLCH its lightness is 47%, its chroma 0.068 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.021 away. White text reads best on it, at 6.73:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (47%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.11:1 |
| White text | 6.73:1 |
Values
| HEX | #21646F |
| RGB | rgb(33, 100, 111) |
| HSL | hsl(188, 54%, 28%) |
| OKLCH | oklch(46.6% 0.068 210.4) |
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 #21646F | 6.73:1 | AA | Lc -88.0 | Fine for body text |
| Black text on #21646F | 3.11:1 | AA large text | Lc 21.1 | Dividers and decoration only |
| #21646F text on white | 6.73:1 | AA | Lc 83.0 | Fine for body text |
| #21646F text on black | 3.11:1 | AA large text | Lc -19.0 | 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
#CCDDE0
oklch(88.6% 0.019 209.4)
-
Step 300
300
#A9C7CC
oklch(80.9% 0.033 208.8)
-
Step 400
400
#7AAAB3
oklch(70.7% 0.053 210.4)
-
Step 500
500
#5695A0
oklch(63.2% 0.067 209.9)
-
Step 600
600
#387F8B
oklch(55.6% 0.073 210.1)
-
Step 700
700 (this color)
#21646F
oklch(46.6% 0.068 210.4)
-
Step 800
800
#245760
oklch(42.6% 0.056 210.8)
-
Step 900
900
#23484F
oklch(37.7% 0.044 211.3)
-
Step 950
950
#152A2E
oklch(26.9% 0.028 211.1)
#21646F 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) | #5B6070 | 0.064 |
| Deuteranopia (no green cones) | #4F586F | 0.058 |
| Tritanopia (no blue cones) | #006967 | 0.027 |
| Achromatopsia (no color) | #5C5C5C | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21646F
#21646F
oklch(46.6% 0.068 210.4)
- #7B4B43
#7B4B43
oklch(46.6% 0.067 30.1)
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 #21646F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.021
- Petrol #005F6A ΔE 0.024
- Dark Green Blue #1F6357 ΔE 0.039
- Deep Turquoise #017374 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.047
- Dark Aquamarine #017371 ΔE 0.047
- Slate #516572 ΔE 0.051
- Denim #3B638C ΔE 0.057
Use #21646F 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.