#21717C
Closest named color: Deep Turquoise (#017374). oklch(50.6% 0.076 208.3), rgb(33, 113, 124).
Aa
White text reads best on this color (5.64:1).
About this color
#21717C is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 51%, its chroma 0.076 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Turquoise (#017374), ΔE 0.020 away. White text reads best on it, at 5.64:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Deep Turquoise (#017374) |
| Black text | 3.71:1 |
| White text | 5.64:1 |
Values
| HEX | #21717C |
| RGB | rgb(33, 113, 124) |
| HSL | hsl(187, 58%, 31%) |
| OKLCH | oklch(50.6% 0.076 208.3) |
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 #21717C | 5.64:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #21717C | 3.71:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #21717C text on white | 5.64:1 | AA | Lc 77.9 | Fine for body text |
| #21717C text on black | 3.71:1 | AA large text | Lc -23.8 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CADDE0
oklch(88.4% 0.021 208.1)
-
Step 300
300
#A6C8CD
oklch(81% 0.037 207.3)
-
Step 400
400
#74ABB4
oklch(70.6% 0.059 208.8)
-
Step 500
500
#4C96A2
oklch(63% 0.076 209.2)
-
Step 600
600
#2A808D
oklch(55.5% 0.082 209.4)
-
Step 700
700 (this color)
#21717C
oklch(50.6% 0.076 208.3)
-
Step 800
800
#1A5861
oklch(42.6% 0.063 208.9)
-
Step 900
900
#1D494F
oklch(37.7% 0.049 207.4)
-
Step 950
950
#122B2E
oklch(27.1% 0.031 205.7)
#21717C 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) | #676D7D | 0.073 |
| Deuteranopia (no green cones) | #5A637C | 0.067 |
| Tritanopia (no blue cones) | #007674 | 0.026 |
| Achromatopsia (no color) | #676767 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21717C
#21717C
oklch(50.6% 0.076 208.3)
- #8C544C
#8C544C
oklch(50.8% 0.076 28.8)
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 #21717C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Turquoise #017374 ΔE 0.020
- Deep Aqua #08787F ΔE 0.021
- Dark Aquamarine #017371 ΔE 0.024
- Bluegreen #017A79 ΔE 0.031
- Dark Aqua #05696B ΔE 0.037
- Sea Blue #047495 ΔE 0.039
- Ocean #017B92 ΔE 0.039
- Teal #008080 ΔE 0.045
Use #21717C 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.