#21777C
Closest named color: Deep Aqua (#08787F). oklch(52.2% 0.079 200.8), rgb(33, 119, 124).
Aa
White text reads best on this color (5.25:1).
About this color
#21777C is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 52%, its chroma 0.079 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Aqua (#08787F), ΔE 0.009 away. White text reads best on it, at 5.25:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Deep Aqua (#08787F) |
| Black text | 3.99:1 |
| White text | 5.25:1 |
Values
| HEX | #21777C |
| RGB | rgb(33, 119, 124) |
| HSL | hsl(183, 58%, 31%) |
| OKLCH | oklch(52.2% 0.079 200.8) |
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 #21777C | 5.25:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #21777C | 3.99:1 | AA large text | Lc 28.3 | Dividers and decoration only |
| #21777C text on white | 5.25:1 | AA | Lc 75.8 | Fine for body text |
| #21777C text on black | 3.99:1 | AA large text | Lc -25.9 | 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
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CADEDF
oklch(88.6% 0.021 200.4)
-
Step 300
300
#A5C8CB
oklch(80.8% 0.038 202.8)
-
Step 400
400
#72ACB0
oklch(70.6% 0.061 201.4)
-
Step 500
500
#48989D
oklch(63.2% 0.078 200.9)
-
Step 600
600
#238287
oklch(55.6% 0.085 200.3)
-
Step 700
700 (this color)
#21777C
oklch(52.2% 0.079 200.8)
-
Step 800
800
#155A5D
oklch(42.8% 0.065 199.3)
-
Step 900
900
#1A4A4D
oklch(37.8% 0.051 200.9)
-
Step 950
950
#112B2D
oklch(27% 0.032 202.1)
#21777C 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) | #6E727C | 0.080 |
| Deuteranopia (no green cones) | #61687C | 0.074 |
| Tritanopia (no blue cones) | #007C78 | 0.021 |
| Achromatopsia (no color) | #6C6C6C | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21777C
#21777C
oklch(52.2% 0.079 200.8)
- #925756
#925756
oklch(52.4% 0.079 21.1)
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 #21777C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Aqua #08787F ΔE 0.009
- Bluegreen #017A79 ΔE 0.015
- Deep Turquoise #017374 ΔE 0.021
- Dark Aquamarine #017371 ΔE 0.024
- Teal #008080 ΔE 0.027
- Ocean #017B92 ΔE 0.033
- Sea Blue #047495 ΔE 0.044
- Dark Aqua #05696B ΔE 0.050
Use #21777C 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.