#21717E
Closest named color: Deep Aqua (#08787F). oklch(50.7% 0.077 210.6), rgb(33, 113, 126).
Aa
White text reads best on this color (5.63:1).
About this color
#21717E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 51%, its chroma 0.077 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Aqua (#08787F), ΔE 0.022 away. White text reads best on it, at 5.63:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Deep Aqua (#08787F) |
| Black text | 3.72:1 |
| White text | 5.63:1 |
Values
| HEX | #21717E |
| RGB | rgb(33, 113, 126) |
| HSL | hsl(188, 58%, 31%) |
| OKLCH | oklch(50.7% 0.077 210.6) |
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 #21717E | 5.63:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #21717E | 3.72:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #21717E text on white | 5.63:1 | AA | Lc 77.9 | Fine for body text |
| #21717E text on black | 3.72:1 | AA large text | Lc -23.9 | 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
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CADDE1
oklch(88.5% 0.021 211.8)
-
Step 300
300
#A6C8CE
oklch(81% 0.037 209.5)
-
Step 400
400
#74ABB6
oklch(70.7% 0.06 211.5)
-
Step 500
500
#4C96A3
oklch(63.1% 0.076 210.4)
-
Step 600
600
#2A808E
oklch(55.5% 0.082 210.4)
-
Step 700
700 (this color)
#21717E
oklch(50.7% 0.077 210.6)
-
Step 800
800
#1A5863
oklch(42.7% 0.064 211.8)
-
Step 900
900
#1D4950
oklch(37.8% 0.049 209.3)
-
Step 950
950
#122B2F
oklch(27.1% 0.032 209)
#21717E 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) | #666D7F | 0.072 |
| Deuteranopia (no green cones) | #59637E | 0.066 |
| Tritanopia (no blue cones) | #007775 | 0.029 |
| Achromatopsia (no color) | #676767 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21717E
#21717E
oklch(50.7% 0.077 210.6)
- #8C544A
#8C544A
oklch(50.7% 0.077 30.8)
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 #21717E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Aqua #08787F ΔE 0.022
- Deep Turquoise #017374 ΔE 0.023
- Dark Aquamarine #017371 ΔE 0.027
- Bluegreen #017A79 ΔE 0.032
- Sea Blue #047495 ΔE 0.036
- Ocean #017B92 ΔE 0.037
- Dark Aqua #05696B ΔE 0.039
- Teal #008080 ΔE 0.046
Use #21717E 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.