#21728A
Closest named color: Sea Blue (#047495). oklch(51.5% 0.084 222.1), rgb(33, 114, 138).
Aa
White text reads best on this color (5.47:1).
About this color
#21728A is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 52%, its chroma 0.084 and its hue 222°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.018 away. White text reads best on it, at 5.47:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.83:1 |
| White text | 5.47:1 |
Values
| HEX | #21728A |
| RGB | rgb(33, 114, 138) |
| HSL | hsl(194, 61%, 34%) |
| OKLCH | oklch(51.5% 0.084 222.1) |
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 #21728A | 5.47:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #21728A | 3.83:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #21728A text on white | 5.47:1 | AA | Lc 77.0 | Fine for body text |
| #21728A text on black | 3.83:1 | AA large text | Lc -24.8 | 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
#E2ECEF
oklch(93.6% 0.011 217.5)
-
Step 200
200
#CADDE4
oklch(88.5% 0.023 221.8)
-
Step 300
300
#A5C7D4
oklch(80.9% 0.041 223)
-
Step 400
400
#72AABE
oklch(70.6% 0.065 222.4)
-
Step 500
500
#4A95AD
oklch(63.1% 0.082 221.4)
-
Step 600
600
#267F99
oklch(55.7% 0.09 221.7)
-
Step 700
700 (this color)
#21728A
oklch(51.5% 0.084 222.1)
-
Step 800
800
#17576A
oklch(42.6% 0.069 222.1)
-
Step 900
900
#1B4856
oklch(37.7% 0.054 221.6)
-
Step 950
950
#112A32
oklch(26.9% 0.034 221.3)
#21728A 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) | #646F8B | 0.067 |
| Deuteranopia (no green cones) | #56658A | 0.060 |
| Tritanopia (no blue cones) | #007A7A | 0.042 |
| Achromatopsia (no color) | #696969 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21728A
#21728A
oklch(51.5% 0.084 222.1)
- #905740
#905740
oklch(51.6% 0.084 42.6)
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 #21728A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.018
- Ocean #017B92 ΔE 0.027
- Deep Aqua #08787F ΔE 0.031
- Ocean Blue #03719C ΔE 0.031
- Deep Turquoise #017374 ΔE 0.040
- Muted Blue #3B719F ΔE 0.042
- Metallic Blue #4F738E ΔE 0.042
- Bluegreen #017A79 ΔE 0.044
Use #21728A 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.