#21687B
Closest named color: Dark Aqua (#05696B). oklch(48.2% 0.075 219.3), rgb(33, 104, 123).
Aa
White text reads best on this color (6.30:1).
About this color
#21687B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 48%, its chroma 0.075 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.031 away. White text reads best on it, at 6.30:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.33:1 |
| White text | 6.30:1 |
Values
| HEX | #21687B |
| RGB | rgb(33, 104, 123) |
| HSL | hsl(193, 58%, 31%) |
| OKLCH | oklch(48.2% 0.075 219.3) |
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 #21687B | 6.30:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #21687B | 3.33:1 | AA large text | Lc 22.9 | Dividers and decoration only |
| #21687B text on white | 6.30:1 | AA | Lc 81.1 | Fine for body text |
| #21687B text on black | 3.33:1 | AA large text | Lc -20.8 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3ECEF
oklch(93.7% 0.01 219.6)
-
Step 200
200
#CBDDE2
oklch(88.6% 0.021 216.2)
-
Step 300
300
#A8C7D1
oklch(81% 0.036 219.3)
-
Step 400
400
#78AAB9
oklch(70.8% 0.057 218.4)
-
Step 500
500
#5294A8
oklch(63.1% 0.074 219.7)
-
Step 600
600
#337E93
oklch(55.5% 0.08 219.4)
-
Step 700
700 (this color)
#21687B
oklch(48.2% 0.075 219.3)
-
Step 800
800
#205766
oklch(42.7% 0.062 219)
-
Step 900
900
#214853
oklch(37.8% 0.048 218.6)
-
Step 950
950
#142A31
oklch(27% 0.031 220.6)
#21687B 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) | #5C657C | 0.063 |
| Deuteranopia (no green cones) | #505C7B | 0.056 |
| Tritanopia (no blue cones) | #006E6E | 0.035 |
| Achromatopsia (no color) | #606060 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21687B
#21687B
oklch(48.2% 0.075 219.3)
- #824F3E
#824F3E
oklch(48.2% 0.074 39.2)
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 #21687B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.031
- Deep Turquoise #017374 ΔE 0.040
- Petrol #005F6A ΔE 0.041
- Denim #3B638C ΔE 0.042
- Dark Aquamarine #017371 ΔE 0.043
- Peacock Blue #016795 ΔE 0.044
- Slate #516572 ΔE 0.047
- YInMn Blue #415A77 ΔE 0.047
Use #21687B 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.