#21757A
Closest named color: Deep Aqua (#08787F). oklch(51.6% 0.077 200.9), rgb(33, 117, 122).
Aa
White text reads best on this color (5.39:1).
About this color
#21757A is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 52%, its chroma 0.077 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Aqua (#08787F), ΔE 0.012 away. White text reads best on it, at 5.39:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Deep Aqua (#08787F) |
| Black text | 3.89:1 |
| White text | 5.39:1 |
Values
| HEX | #21757A |
| RGB | rgb(33, 117, 122) |
| HSL | hsl(183, 57%, 30%) |
| OKLCH | oklch(51.6% 0.077 200.9) |
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 #21757A | 5.39:1 | AA | Lc -81.9 | Fine for body text |
| Black text on #21757A | 3.89:1 | AA large text | Lc 27.5 | Dividers and decoration only |
| #21757A text on white | 5.39:1 | AA | Lc 76.6 | Fine for body text |
| #21757A text on black | 3.89:1 | AA large text | Lc -25.2 | 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
#A5C8CA
oklch(80.8% 0.037 200.7)
-
Step 400
400
#73ACB0
oklch(70.7% 0.06 201.5)
-
Step 500
500
#4A979C
oklch(63% 0.076 201.1)
-
Step 600
600
#268287
oklch(55.7% 0.083 200.4)
-
Step 700
700 (this color)
#21757A
oklch(51.6% 0.077 200.9)
-
Step 800
800
#17595D
oklch(42.6% 0.064 201)
-
Step 900
900
#1B4A4C
oklch(37.8% 0.051 199.1)
-
Step 950
950
#112B2D
oklch(27% 0.032 202.1)
#21757A 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) | #6C707A | 0.078 |
| Deuteranopia (no green cones) | #5F667A | 0.073 |
| Tritanopia (no blue cones) | #007A76 | 0.021 |
| Achromatopsia (no color) | #6A6A6A | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21757A
#21757A
oklch(51.6% 0.077 200.9)
- #8F5554
#8F5554
oklch(51.5% 0.078 21.2)
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 #21757A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Aqua #08787F ΔE 0.012
- Deep Turquoise #017374 ΔE 0.017
- Bluegreen #017A79 ΔE 0.018
- Dark Aquamarine #017371 ΔE 0.020
- Teal #008080 ΔE 0.032
- Ocean #017B92 ΔE 0.037
- Dark Aqua #05696B ΔE 0.044
- Sea Blue #047495 ΔE 0.045
Use #21757A 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.